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Posts from the ‘Octopus’ category

An Octopus Hunting

A female Giant Pacific Octopus hunting . . . photos brought to the surface for you on April 4, 2021.

This individual lives north of Port Hardy, in Browning Pass.

She’s a giant among other giants.

The Giant Plumose Anemones stand tall above her, at up to 1 metre in height.

Her arms feel between the rocks to flush out prey, her mind processing all she detects from her eight limbs, her vision, and the further stimuli upon her skin.

A China Rockfish is hovering nearby, likely often accompanying her when she is hunting to benefit from what prey emerges when touched by her arms.

Her colours change, flashing white at times. Then, again camouflaged among the boulders covered with the pink of coralline algae species, and studded with Orange Cup Corals and the plumes of feeding tentacles of Orange Sea Cucumbers.

Two humans are in awe at chancing upon her and being able to hover, navigating the space between not wanting to disturb and also wanting to amplify the wonder above the surface, hoping it somehow contributes to being better humans.

We’re aware too that we are limited by how much air remains in our tanks; the nitrogen building in our blood; and the cold creeping in through our dry suits (despite the adrenaline surge of watching her).

But she, she is limitless here.

She is perfection.

This image provides a clue about her gender. See information near end of the blog.

Please note that photos are cropped.
Our presence was certainly not undetected but wanted to minimize disturbance.
The China Rockfish that was following her as she hunted.
Her eyes are closed (likely due to the annoying light coming from me) but she can still detect light. Read below.

Octopus Gender:

I know this was a female because the third arm on the right does not have a “hectocotylus”. Male octopuses have a specialized arm with no suckers at the tip called the “hectocotylus arm” by which they hand off spermatophores to the female. In Giant Pacific Octopuses, the hectocotylus arm is the third on the right. See more in my recent blog “Giant Pacific Octopuses, How Do They Mate?” at this link.


Octopus Vision:

You can see that the pupil’s shape is very different from ours. Their retina is very different too.

Octopuses and other cephalopods have only one kind of photoreceptor cell while we have rod cells and three types of cone cells allowing us to see in colour. So how can cephalopods discern colour when they have only one kind of light receptor in their eyes? And they must be able to discern differences in colour. Consider how they signal with colour and how they camouflage.

Research from 2016 puts forward that their uniquely shaped pupils act like prisms, scattering light into different wavelengths (chromatic aberration), rather than focussing the light into a beam onto the retina.  The hypothesis, tested with computer modelling, is that cephalopods can then focus the different wavelengths onto their retina separately by changing the distance between the lens and the retina, thereby separating the stimuli and discerning colour. Note that the sharpness of their vision is believed to be different for different wavelengths / colours.

Even with their eyes closed, octopuses can detect light with their skin. This is tied to their ability to camouflage with the photoreceptors in their skin responding to specific wavelengths of light (different wavelengths = different colours).

Note too that octopuses do not have eyelids. They have have a ring-shaped muscular fold of skin around the eye that closes in the way of an eyelid (especially when some annoying human is taking photos).


More Octopuses Hunting

Here’s the link to another experience where we saw a Giant Pacific Octopus hunting AND interacting with a Wolf-Eel (includes video).


Sources

Katz, I., Shomrat, T., & Nesher, N. (January 01, 2021). Feel the light: sight-independent negative phototactic response in octopus armsThe Journal of Experimental Biology, 224.

Stubbs, A. L., & Stubbs, C. W. (July 19, 2016). Spectral discrimination in color blind animals via chromatic aberration and pupil shapeProceedings of the National Academy of Sciences of the United States of America, 113, 29, 8206-8211.

Giant Pacific Octopuses – How Do They Mate?

Following on the success of my blog answering the important life question: “How do octopuses poo?“, it’s high time I address “How do octopuses mate?”

Why? Because truly, by having better understanding of the adaptations of species that look so different from us, I believe we can be better humans.

What has catalyzed this blog finally being written is the following video by fellow diver Mel Vincent with buddy Jerry Berry. On a night dive, what they thought was one Giant Pacific Octopus, turned out to be two AND evidence that they had likely mated. The evidence is the empty “spermatophores”.

Spermatophores? The name gives you a good sense of what those might be, they are the rope-like sperm packets of a male octopus.

This is most likely the female although in neither can the 3rd arm on the right be seen to confirm if there is a hectocotylus arm or not. Giant Pacific Octopuses are Enteroctopus dofleini, the largest octopus species in the world.

Male octopuses have a specialized arm with no suckers at the tip called the “hectocotylus arm”. In Giant Pacific Octopuses, the hectocotylus arm is the third on the right. The section at the top which has the spermatophores is called the “ligula”. This section does not have the cells that allows colour and texture to change (the chromatophores). So the males often keep it curled up which helps discern males and females i.e. look for a curled up arm.

The spermatophores are made inside the male and the male grabs them by passing the hectocotylus arm into his body through the siphon when it is go time.  It’s not a fast process. Apparently it takes about an hour for the sperm to move to the top end of the spermatophore. The spermatophores pass down a grove in that arm helped by cilia. Ultimately the spermatophores are ejected by the ligula and the shape of the spermatophore (and swelling inside the female), lock it in place in the female.

Where to “deliver” the contribution to the next generation in a female octopus? Through her siphon, to her oviduct(s). The swollen end of the spermatophore then bursts and the female stores the sperm in her “sperm receptacle” till ready to fertilize and then lay her eggs. Reportedly, about 40 days after copulation (delivery of the spermatophores) the female attaches up to ~68,000 fertilized eggs to the top of the den she has chosen  . . . to be her last.

Credit: Pierangelo Pirak Source: BBC article on octopus sex

In Giant Pacific Octopuses, a spermatophore can apparently be up to 1 meter long and contain over four billion sperm. Usually two spermatophores are involved in one copulation. Such large numbers of sperm, and eggs, are needed when your babies hatch into the soup of the ocean. But mother gives them a fighting chance. Read on!

The spent spermatophores apparently may hang from the female for a while so can it be known for sure that the two Giant Pacific Octopuses Mel documented had just mated, or mated at all? It can’t be known definitively but with there being two octopuses, and that they had been interacting, it does suggest that mating had occurred. It certainly is extraordinary to have chanced upon the spermatophores of wild Giant Pacific Octopuses.

Top of a male Giant Pacific Octopus’ hectocotylus arm (ligula). Photo ©Jim Cosgrove.


I am very grateful to Jim Cosgrove, Neil McDaniel and Harbour Publishing for permission to include the following text on reproduction in Giant Pacific Octopuses from their book “Super Suckers – The Giant Pacific Octopus and Other Cephalopods of the Pacific Coast. It’s SUCH a good resource.

“FINDING A MATE…OR NINE?

When a female giant Pacific Octopus is ready to mate, it appears that she selects a den and attracts males to her. There is no conclusive evidence on how the female entices males, but there are strong indications that she produces some sort of chemical attractant. There are several reasons for believing this to be true.

The first reason is that giant Pacific octopuses are ordinarily solitary, and a smaller female would normally avoid a larger male that might attack and eat her. Jim has seen as many as nine males, however, in the immediate proximity of a female in a den. The males were scattered around the den and appeared to be unaware of each other, as there were no interactions amongst them. This was most unusual.

The second reason is that Jim has observed and seen video of large males standing atop prominent rocks. The octopus faces into the current and spreads out his arms like an open umbrella, turning slowly back and forth as the current flows past. We know that octopus suckers are sensitive chemical sensors, so it’s likely that the male tastes the water flowing past. His slow turning may enable him to identify the direction of the female’s attractant.

How the female selects a male—and whether she mates with one or more than one male -a re still unknown. Jim is currently working with a genetics professor at the University of Victoria to try to resolve these questions.

Once a female selects a male, there are several ways in which the male transfers sperm to her. Sometimes the male mounts the female, almost completely covering her. In other cases the male merely extends his hectocotylized third right arm into the fe male’s den. Although the actual transfer of sperm requires only two to four hours, the mating process can last several days, so divers have a considerable handicap when trying to observe such behaviour. Indeed it is a rare event to witness a mating pair, and Jim has only seen nine matings. This is one situation in which observations in an aquarium are far easier than  those in the open ocean. An aquarium  researcher can set up a video camera and organize teams to watch the process on a 24-hour schedule until the event ends.

Jim, along with three other researchers, has combined experiences from open ocean and aquarium observations to produce a publication about giant Pacific Octopus matings. The study revealed that the male and fe male mate for approximately four hours and that repeat matings have been observed. In aquariums there is usually only one male in the tank with the female, so questions about multiple males and how the female selects a particular mate remain unanswered.

The male passes the female an elongated package of sperm called a spermatophore, which may be up to one metre (three feet) long, which he deposits in one of the female’s two oviducts. It is believed that when mating the male actually places two spermatophores in the female, one at the entrance to each oviduct. At this time the female is not yet pregnant—the term really does not apply to invertebrates anyway—but she has stored the sperm and will head off to find a suitable den to lay her eggs. The male, if he still has unused spermatophores, may try to find another female.

Thę den the female selects is usually deeper than 20 m (66 ft). Jim has noted that dens where previous females have nested were reused 41 percent of the time. These preferred dens tend to be under large flat rocks that provide a suitable overhead surface for the female to attach her eggs.

Once the female selects the den, she sometimes fortifies it by gathering rocks from the surrounding area and dragging them to the den. She often piles them up to create a wall of boulders that keeps out predators. A few days to a month may elapse between mating and selecting and preparing a den.

LAYING THE EGGS

Now the female begins to lay her eggs. She turns upside down and clings to the roof of the den while she lays the tiny eggs one at a time. Each egg is produced in the ovary and coated with rich yolk to provide energy for the developing embryo. At this point some sperm is used to fertilize the egg, and it is coated with a material that hardens into a rubbery, semi-opaque shell. Each egg is extruded individually through the funnel and grasped by the small suckers that surround the mother’s mouth.

The body of the egg is a mere six millimetres (0.2 in) long about the size of a grain of rice—with a slender tail that adds another 11 mm (0.4 in), making the total length of the egg about 17 mm (0.7 in). The mother’s small suckers deftly manipulate the tail of the egg along with the fails of other eggs and weave them together into a slender string. She produces a secretion and applies it to the tails to bind them together. Over a period of three or four hours, while hanging upside down, the female produces a string containing an average of 176 eggs. Having glued this string to the roof of the den, the female descends to rest before returning to lay another string.

Eventually, over 28 to 42 days, the female will produce a complete nest of about 390 strings with approximately 68,000 eggs.

Female Giant Pacific Octopus tending her eggs. Photo ©Jim Cosgrove.

NESTING BEHAVIOUR: THE LONG WAIT

Once the female has finished laying, she spends the next 6.5 to 11 months tending the eggs. She grooms them with her suckers to ķeep them free of bacteria and other organisms that might damage them. Usually she is not completely successful, as often some eggs are encrusted by colonial animals called hydroids and do not hatch.

The female blows water through the strings of eggs with enough force that they jostle around. This helps keep them clean and free of growth and will be critical when the eggs start to hatch. She also protects the nest against predators such as sea stars, not always successfully. Mottled sea stars (Evasterias troschelii) have been observed robbing egg strings from a den.

Video above by Laura James of a mother Giant Pacific Octopus tending her eggs.

Other creatures enter the nest but do not appear to do any damage. These include small worms, snails and crabs such as the longhorn decorator crab (Chorilia longipes) and the sharpnose crab (Scyra acutifrons).

While the female tends her eggs, she does not feed. We don’t know the exact reason for this, but one suggestion is that if the female left the den to hunt, she would leave the eggs unat tended and vulnerable to predators. Another suggestion is that the presence of food scraps in or near the den might attract predators. Jim does not subscribe to either of these theories. Because this behaviour is common to many cephalopods, he believes it is more likely linked to an ancestral trait, the reason for which may no longer exist. This is an example of innate behaviour, part of the hard-wired information an octopus is, born with.

The development of the embryos depends on the surrounding water temperature. The colder the water, the slower the develop ment; the warmer the water, the faster it proceeds. This is true among most egg-laying marine invertebrates.

Jim has been able to observe much of the development in the wild and develop a time frame for estimating when hatching would occur. If he was lucky enough to have witnessed the egg laying, he would have a pretty accurate idea of how the eggs would look as they developed. In most cases he did not see the egg laying, however, and would have to observe the eggs for signs of development to predict when they would hatch.

WATCHING THE EGGS: A DIVER’S VIEW

Newly laid eggs are glossy white and look like white raindrops. The core that the eggs are woven into is pale green, but within a few weeks the core turns black and remains so

Two small red dots appear on each egg about 120 to 150 days after the eggs are laid. These dots, the developing eyes of the embryo, are visible through the egg shell. The eggs are no longer as shiny white, and soon one can see the brighter yolk sac in the large end of the egg and the darker developing embryo at the small end.

About 180 to 210 days after the eggs are laid, the embryo has used up much of the yolk, and the size of the yolk sac has de creased while the size of the embryo has increased. So that the embryo can continue growing, it moves into the larger portion of the egg. This is actually the second reversal, but it is the only one that a diver can observe. 

Over the next few months a diver can watch as the yolk sac becomes smaller and the eggs become darker. Those with sharp eyes may be able to see the movement of the embryo within the egg and the flashing of brown and white colours as the embryo tries out its chromatophores. 

About 240 to 270 days after the eggs are laid, hatching occurs.

Giant Pacific Octopuses hatching. Photo ©Jim Cosgrove.

THE NIGHT OF THE HATCH 

It might seem logical that the eggs would hatch over the same period of time and in the same order as they were laid. This does happen in many octopuses, including the giant Pacific octopus, but not always. Jim has witnessed a number of hatchings in which he has seen the nest intact one day and completely hatched out the next morning.

Jim collected strings of unhatched eggs from time to time and took them to his lab. When observing the eggs through a dissect ing microscope, he found that the water surrounding the eggs was warmed by the microscope lights, often causing the eggs to hatch. He probably collected strings of eggs that had not been laid at the same time, yet even eggs from different strings hatched nearly simultaneously. 

Some type of chemical released from a hatched egg stimulates other eggs to hatch as well, Jim suspected. The embryos often had different amounts of food remaining in the yolk sac below their mouth. In some cases the yolk sac was consumed, but in others the yolk sac was still large enough that the paralarva had to bite it off. Clearly some of the paralarvae were not as well developed as others but were able to survive even if they hatched somewhat prematurely. 

The hatch normally occurs at night. It may start at dusk, but often it is several hours after dark before things really get under way. As the eggs hatch in ever-increasing numbers, the female blows strongly onto the strings of eggs, causing them to thrash around. This helps the paralarvae to pop out of the eggs and aids in flushing them away from the den. 

MOTHER’S JOB IS DONE 

In most cases the female survives the hatching and lingers in the den for another few weeks before she dies. During the entire nesting period, which may have dragged on as long as 11 months, the female has not eaten. By hatching time she has lost more than 60 percent of her body weight, sometimes as much as 85 percent! Even though the eggs have hatched the female continues to “mother” them as before. She grooms the hatched-out egg cases even though the paralarvae are long gone. 

Experiments have been done in which the eggs have been re moved from the ovary of a mated female. Incredibly the female went through the entire egg laying and grooming process, even though she had no eggs or nest. This “phantom nesting” shows that a behavioural lock and key is triggered at sexual maturity or at mating.

In some cases the female does not have enough energy stored to survive the whole nesting period and dies before the eggs hatch. Usually her last act is to vacate the den and crawl away. She usually only moves a metre or two before she dies. Again there is no solid evidence on why the female va cates the den, but Jim sub scribes to the theory that if the female died in the den her de composing body could foul the water and attract scavengers.. One can understand that fe males not leaving the den might have resulted, in an evolution ary sense, in the nest being dis covered and eaten. This would result in the failure of her genes to be passed on to successive generations. The genes that were passed on would be those of females who successfully distracted predators away from the nest. 

While this strategy is interesting, it is not totally successful. In several cases where the female died before the eggs hatched, even though the embryos developed properly, the eggs did not hatch. Without the agitation provided by the female blowing wa ter over them, the closely packed eggs remain immobile and pressed against each other. As a result the paralarvae are unable to force their way out of the eggs, and most perish. 

Jim found it sad to observe nests where only a partial hatch was successful. As he counted strings and eggs, he often found thousands of dead paralarvae. Sometimes nature seemed harsh and wasteful.”

Video below by Laura James of Giant Pacific Octopuses hatching and mother dying.


Male anatomy on left  and female on right. Source: Hanlon, R., & Messenger, J. (2018). Reproductive Behaviour. In Cephalopod Behaviour (pp. 148-205). Cambridge: Cambridge University Press. doi:10.1017/9780511843600.008


Further detail on mating in Giant Pacific Octopuses from “A Snail’s Odyssey” 

“After a short courtship, the male Enteroctopus dolfleini grabs the thin or distal end of a spermatophore from its penis using the groove in its hectocotylus arm and thrusts it into the orifice of one of the female’s oviducts. This initiates a complex series of events within the spermatophore that cause the sperm rope to be pushed into the thin or distal end, which swells to accommodate the incoming load of sperm and leads to evagination of the ejaculatory apparatus (see illustration on Left). This action locks the sperm-filled swelling in place within the oviduct and prevents it from dropping out of the female. The sperm rope is moved along by pressure from seawater diffusing into the proximal end of the spermatophore and from elastic contraction of the sperm rope itself. The movement takes about an hour. These actions haul the entire mass of tightly encapsulated spermatozoa over a distance of a meter from the proximal to distal end of the spermatophore. The sperm are now positioned in a swollen bladder or reservoir located at what was previously the thin or distal end of the spermatophore (see photograph on Right). The next step, evagination of the ejaculatory apparatus, occurs suddenly and produces a crink in the tube that locks it in place in the oviduct. The locking-in may additionally ensure that spermatozoa are not lost in “back-flow” from the oviduct. The swollen end of the spermatophore now bursts and the sperm are moved into the female’s sperm receptacle for later use. The process is repeated with a second spermatophore. About 2-3h after the arm is first inserted and after repeated pokings, the female has two empty spermatophores hanging from its oviducal orifices.”

Source: Mann et al. 1966. Nature 211: 1279. Retrieved from https://www.asnailsodyssey.com/index.php?x=469 on 2021-02-06. SW = seawater. 


Sources:

Click to access 5501b1d60cf231de076ae7d2.pdf

Octopuses Shed Their Suckers!

So cool, so cool, SO COOL.

While I was diving today, I saw these structures, like large snowflakes drifting out of a crack between two rocks.

And I knew there had to be a Giant Pacific Octopus there BECAUSE this is the skin at the end of the octopus’ suckers.

Octopuses shed this skin periodically and, possibly, from all their suckers at the same time! The skin grows continuously.

With Giant Pacific Octopuses having about 2,000 suckers (up to ~2,240 in females and 2,140 in males), you can imagine how many of these were drifting out of its den as the octopus exhaled, causing an upward current.

This skin is referenced as the sucker lining or “chitinous cuticle” and you can deduce from the photo below how the skin being shed would be of varying sizes.

 

I could peer into the crack and see the octopus that was shedding but s/he was too deep into the den to be able to get a photo.

How wonderful it would be to be able to provide you video of an octopus shedding its suckers in the wild. But, not surprising, it is easier to capture this with octopuses in captivity.

Below is a video of a captive Giant Pacific Octopus named Marylyn shedding her sucker linings (Video source: Christie Rajcic, “Octopus Shedding Suckers”).

 

I hope this adds to your sense of wonder of our marine neighbours. It also provides a whole new association to the words “So long suckers!” 😉

It’s difficult to explain the joy it gives to not have disregarded these little white bits but to know they were a clue to where there was an octopus.

Oh, and if you enjoyed this, you definitely will want to benefit from my life-enhancing blog “How Octopuses Poo“.


For you super nerds (hello!), the cuticle covers the “infundibulum”. See images below from “A Snail’s Odyssey“.


Sources:

Better Vision – New Year Thoughts and Octopus Eyes

[Update in 2021: CLEARLY I had no idea what a globally and colossally crap year 2020 was going to be when I wrote this blog. May the thoughts and information about octopus eyes still provide vision 🙂 ].
 
Here’s an unlikely combination of introspection and natural history. It’s what results when you bring together a photo of a Giant Pacific Octopus’ eye with the bad word play of “2020 vision” regarding the new year.

Introspection: In a human lifetime, you don’t get to cross the threshold into all too many decades. Like many of you, it makes me take pause . . . wanting to understand where we are and how to move forward with focus. It’s what happens when you want to make sense of a world which appears to have increasing numbers of cartoon-character-like heads of state. It makes me think about the state of heads, and how to find one’s way without despondency, denial and inaction.

I write these words largely to solidify my resolve and vision in this decadal transition but share them here in the hopes that they may be of use to you.

Better vision for better futures:

  1. The paradigm: Realizing why there are forces in the world who would rather flirt with the health of future generations than undertake action that would benefit their own grandchildren. They are those who have benefited the most from lack of equality, fossil-fuel use, rampant consumerism, and use of disposables. Despite the enormity of their power, positive change is happening and in the death throes of the paradigm, the very nature of truth is being challenged. When one shouts loudly, it is not likely they are more correct. It is an attempt to drown out the truth. They are the spasmodic utterances of the entitled. The aims are confusion, distraction, discontent (just keep buying more little girl and happiness will be yours), despondency, overwhelm and (of course) the blunt tool of FEAR. The hope is that we shut down and not notice the steps forward toward a paradigm based on greater equality and sustainability.
  2. Less is more: These are words I have shared so often. Above a true level of need, using less is not about loss. It’s about gain. The more we steer away from the myth that owning more and/or bigger is best or that it equates to “success”, the more liberation we have from being enslaved to $. We do know where true happiness lies. It is where there is greater sense connection, health and time for who and what we love.  What a world it would be if more of us saw that gain and realized just how empowered we are to create change through our consumer and voter action. Using less fossil fuels, dangerous chemicals and disposables positively impacts so many socio-environmental issues.
  3. The way forward: You’ve seen it haven’t you? The uprising, the unblinking truth . . . the power of youth who know the way. How excited I am for power shifting further toward them, their technologies and lifestyles fuelled by values of equality and sustainability. In no way does that mean we stand idle and wait for them to be of the age to vote. For me it is to be in service of them, the next generation. It is to help others see the way, to know their place in nature, to know their power, to find their voice, and to shield them from despondency, and fear.  

And here’s the natural history and marine mystery bit relating to the photo of the octopus’ eye (note that she was in her den and that I used a zoom lens).

Octopus vision:

You see that the pupil’s shape is very different from ours. Their retina is very different too.

Octopuses and other cephalopods have only one kind of photoreceptor cell while we have rod cells and three types of cone cells allowing us to see in colour. So how can cephalopods discern colour when they have only one kind of light receptor in their eyes? And they must be able to discern differences in colour. Consider how they signal with colour and how they camouflage.

Research from 2016* puts forward that their uniquely shaped pupils act like prisms, scattering light into different wavelengths (chromatic aberration), rather than focussing the light into a beam onto the retina.  The hypothesis, tested with computer modelling, is that cephalopods can then focus the different wavelengths onto their retina separately by changing the distance between the lens and the retina, thereby separating the stimuli and discerning colour. Note that the sharpness of their vision is believed to be different for different wavelengths / colours.

Even with their eyes closed, octopuses can detect light with their skin. This is tied to their ability to camouflage with the photoreceptors in their skin responding to specific wavelengths of light (different wavelengths = different colours).

Note too that octopuses do not have eyelids. They have have a ring-shaped muscular fold of skin around the eye that closes in the way of an eyelid (especially when some annoying human is taking photos).


There, I feel much better now. Bring on the New Year.

Here’s to all the colour, marvellous mysteries, clear vision, and solid action ahead.


*Sources

Katz, I., Shomrat, T., & Nesher, N. (January 01, 2021). Feel the light: sight-independent negative phototactic response in octopus armsThe Journal of Experimental Biology, 224.

Stubbs, A. L., & Stubbs, C. W. (July 19, 2016). Spectral discrimination in color blind animals via chromatic aberration and pupil shapeProceedings of the National Academy of Sciences of the United States of America, 113, 29, 8206-8211.

Markus . . . and the Octopus.

Today something extraordinary happened.

It happened when we placed a memorial for a dear departed friend, Markus Kronwitter.

My primary reason for sharing this is for Markus’ family and friends but, I think others will find something here too.

You see, a Giant Pacific Octopus attended and sat right atop the memorial.

Let me recount using photos.

Memorial made by Stephanie Lacasse.

 

Markus owned and operated North Island Diving in Port Hardy. He was a dear friend and incredibly important to our dive club, the Top Island Econauts. He died more than 3 years ago and the memorial today was to honour him and maybe offer some comfort to his wife Cecelia and his two daughters, Rosie and Jennifer.

The location was Five Fathom Rock just outside Port Hardy.  Part of Markus’ legacy is that he fought for this rocky reef to be recognized as a Rockfish Conservation Area. (More about the significance of that in my eulogy at the end of this blog).

After we shared thoughts about Markus at the surface, down we went to the highest point of the reef. We would wait there till the memorial was carefully descended by Steve Lacasse of Sun Fun Divers using a lift bag and rope.

We wanted to position the memorial there, near a sunken metal beer keg. The keg used to be a mooring float on this site. It was put there by Markus but, by mysterious means, had sunk to the bottom.

As soon as we got to where the memorial was to be placed, I saw a Giant Pacific Octopus, fully out in the open.

You can even see the beer keg right in the background.

After about 5 minutes, he retreated partially into his den, likely because of some annoying underwater photographer with flashing lights.

Note that I do know this was a male Giant Pacific Octopus because the third arm on the right was a “hectocotylus arm”. Only males have the hectocotylus which stores sperm. More on that at this link. (This individual also had an injured arm. It was only about half length but will regrow. Yes, some of the awe that is octopuses, is that they can regenerate limbs.

Giant Pacific Octopus in his den.

But then . . . when Steve arrived with the memorial, the Giant Pacific Octopus darted out of his den, landed right atop the memorial and started flashing white. See the memorial under the octopus in the photos below?

Steve Lacasse with the octopus on the memorial which was still attached to the rope and lift bag.

 

You can imagine how we marvelled as this unfolded and that some pretty big emotions were felt.

Eventually, the Giant Pacific Octopus moved away. Then, the memorial could be positioned as we had intended, but not before a mature male Wolf Eel also went swimming by.

There’s no photo of that I am afraid. I was a little overwhelmed.

Memorial positioned.

 

Dive club members from left to right: Dwayne Rudy, Steve Lacasse, Natasha Dickinson, Gord Jenkins and Andy Hanke.

Somewhat dizzied by emotion, we continued with the dive.

Below, I include some photos of what we saw, especially to give Markus’ loved ones a sense of what this site is like and what he fought for.

Mature male Wolf-Eel in his den, very near the memorial.

 

One of 100s of Black Rockfish at this site (and a Mottled Star).

 

Male Lingcod guarding an egg mass with 100s of eggs.

 

Male Ling Cod. The boulders here give an indication of why this is such ideal fish habitat. There are so many crevices to hide in and rocks to lounge upon.

 

Rose Anemones aka Fish-Eating Telias. Sun shining down from the surface, five fathoms above us.

 

Tiger Rockfish – longevity can be 116 years WHEN given a chance.

 

See the male Lingcod under the huge mass of eggs? He’s got a lot to protect!

 

And then . . . just as we were about to ascend, there he was again – the same Giant Pacific Octopus.

The Giant Pacific Octopus with dive buddy, Natasha Dickinson.

 

How I wish we could have stayed longer. We had to surface to a far less mysterious world, but with hearts full and so much to tell Cecelia, Jenny and Rosie.

Goodbye Markus.

We’ll be visiting again soon.

Image below is of the memorial 20 months later, October 2020. It has become part of the seascape and it appears a China Rockfish is living very near.


My Eulogy for Markus. 

It’s my great honour to say a few words before we dive on Five Fathom Rock to position Markus’ memorial.

I of course found it excruciating to try to find the words fitting of Markus, because you have to tap into the emotion to find the words.

It’s been more than 3 years since Markus died. Cecelia, Jenny and Rosie you need the words and, even more, you need this place where your thoughts and feelings can be anchored.

In trying to find the words, I dared remember what it felt like to be around Markus. I don’t think that I know anyone else who was quite like him in knowing the right thing to do, no matter how hard it would be and no matter how many injustices he had suffered.

Markus was about making things better and standing up for what was right. He was a man of truth and science. He appeared unflinching in facing reality. He did not suffer fools. He saw through people with crystalline clarity. He walked his own path – in red “holely soles” and multi-coloured pants – and had the wisdom to stop to have Cecelia join to walk beside him.

He made hard decisions.

He . . . was . . . a . . . fighter.

He fought to be here on northern Vancouver Island.

He fought for his girls.

He fought for our dive club.

He fought for the fishes, now flourishing beneath us.

He fought for his life.
[When diagnosed with cancer, he was told he had 2 years to live. He lived for 14 years post diagnosis].

And he has left an extraordinary legacy.

Part of this, is the legacy of Five Fathom Rock.

Markus fought for this to be a Rockfish Conservation Area so that the fish that live here might get a chance to grow bigger, reproduce more, and to thrive.

And there’s success. It’s so beautiful down there Rosie, Jenny and Cecelia. The fishes are thriving – there are clouds of rockfish and it’s so powerful to think that some, like the Tiger Rockfish, might get a chance to live to be more than 100-years-old.

If there were any place where I could picture Markus, it would be here darting around with yellow fins, fish-like himself. Clearly so at home . . . here.

His efforts for Five Fathom included trying to have a mooring here and his creativity was to use a big metal beer keg. It’s down there now, on the highest part of the reef , close to where there are 2 Wolf-Eels. It’s where we’ll attach the memorial.

And how perfect that this will happen at a time when the Lingcod fathers are protecting the next generation, standing guard, not suffering fools, making very clear when you’re trying to get too close without good intent. Fiercely fighting for the next generation, with an extraordinary sense of place.

He loved it here.

It’s impossible to forget him here.

Not that there is any possibility of forgetting Markus or what he stood for.

His legacy of course includes you Rosie, Jenny and Cecelia. He loved you so much and I can’t even imagine how hard he fought wanting to be here still to protect you, to make sure you would always be okay.

Jennifer and Rosie, you are fighters like your Papa Markus.

Jenny – I also think you have his sense of purpose.

Rosie  – I think you have his sense of place.

Cecelia – the love in your eyes makes clear how you carry Markus with you always.

Markus Kronwitter.
It is here on Northern Vancouver Island that he found his wild.
It is with you three, that he found love.

 

 

 

 

 

 

 

 


Compilation of photos and video below.

 

How Do Octopuses Poo?

It’s one of the characteristics that unifies every living thing on the planet – we all need to get rid of waste.

How do octopuses do it? See the video and explanation below.

Why share? Because I solidly believe the world can be a better place through understanding and respecting the commonalities and differences of others AND through marvelling at the natural world.

With great thanks to Krystal Janecki for her video and Neil McDaniel and Jim Cosgrove for their knowledge.

Video above: Giant Pacific Octopus defecating by ©Krystal Janicki November 5 2018, Madrona in Nanoose Bay, British Columbia, Canada. Observations are that in areas where octopuses appear to be eating more bivalves like Swimming Scallops, the poo is whiter / paler in colour. In areas where they appear to be eating more Red Rock Crabs, the poo is various shades of red. (Source: Jim Cosgrove, personal communication).   


The detail below on octopus digestion is from “Super Suckers – The Giant Pacific Octopus and Other Cephalopods of the Pacific Coast
by James A. Cosgrove & Neil McDaniel (Harbour Publishing):

“The first structure for food gathering [in octopuses] is the interbrachial web, the umbrella-like membrane between the arms that the octopus used to enfold food such as crabs, shrimps and sometimes even fishes and birds.The web forms a bag-like container that holds prey close the the mouth . . .

Giant Pacific Octopus hunting. Notice the webbing between the arms = the interbrachial web. 
©Jackie Hildering.

The second structure is the mouth. An octopus has two pair of salivary glads, anterior (front) and posterior (rear). The posterior salivary glans produce a toxin called cephalotoxin. in giant Pacific octopuses this is not known to be deadly to humans, whereas in the blue-ringed octopus of the South Pacific it has killed people. When an octopus captures food in its web, it secretes cephalotoxin into the water, where it is absorbed through the gills of its prey. The neurotoxin affects the nervous system and causes the prey to lose consciousness and stop struggling. The octopus can then use its suckers to aid in dismembering prey such as crab.

The beak, the hardest part of the octopus, is made of the same chitonous material as human fingernails. It is black and looks like the beak of a parrot. The mouth also has a specialized tongue called a radula. The file-like organ is covered with tiny, sharp teeth that are replaced when they wear down, much as sharks regrow teeth. The radular teeth shred the prey’s tissue once the beak has bitten the food into chunks. Working together with the beak and radula are secretions of the anterior (front) salivary gland. The gland produces a mixture of substances called enzymes, which cause the food to break down quickly into a jelly-like substance that can be easily digested. A combination of the enzymes and the radula enables an octopus to remove even the tiniest bit of tissue out of the tip of a crab’s leg.

Giant Pacific Octopus beak. It’s made of keratin.

Once the food is captured, eaten and swallowed, it travels along a short tube called the esophagus (similar to the throat in a human) to a structure called the crop. This is not exactly the same as a bird’s crop, but it does function as a storage place for undigested food.

If the stomach is empty, food passed immediately from the crop to the stomach, which despite distinct differences, functions much like our stomach. In the giant Pacific octopus the digestive enzymes do not come from the wall of the stomach but are produced by the live and introduced into the stomach through ducts. These enzymes cause the food to break down into small molecules that the blood absorbs and transports back to the liver. There they are processed and distributed to the cells of the body. This dual-function liver is different from a human’s whose liver primarily deals with the products of digested food.

Summary of octopus digestion. Source: Super Suckers by James Cosgrove and Neil McDaniel
Harbour Publishing. Illustration by Adrienne Atkins.

Now we find another major difference from vertebrates such as humans and also from squids. Once the food in the octopus stomach is digested, the waste material has to be evacuated. The octopus stomach, however, has only a single tube leading in and out. This means that the waste material must be evacuated through the same tube the food entered before more food can be introduced for digestion. You might call this the “digestion on the instalment plan.” The waste comes out of the stomach into the intestine, which encapsulates it and moves it along till it eventually reaches the end of the intestine located at the entrance to the funnel [aka siphon]. Octopus poop, ejected from the funnel, looks a bit like a slender . . . ribbon . . . .

In giant Pacific octopuses the processing of food, depending on what is being eaten, can take many hours. On average these octopuses make six hunting trips a day, reposing in their den most of the time while they process food.”


Below, video of a giant Pacific octopus hunting. In this encounter, the octopus passes directly over a mature male Wolf Eel in his den. THEN, a Decorator Warbonnet emerges as well.


 

Diagram below names addition octopus anatomy.

 

Further octopus anatomy. Source: Super Suckers by James Cosgrove and Neil McDaniel
Harbour Publishing. Illustration by Adrienne Atkins.

 

Defecation by Pearl the Giant Pacific Octopus at the Sitka Science Marine Science Center. Her diet has a lot of shrimp and crab in it and likely accounts for the colour of the faeces.

Lessons Learned from Octopuses

It’s Canadian Thanksgiving and World Octopus Day (OCTOber 8th = get it?).

There’s so much to be grateful for. The health and freedom that allows me to live this life of depth; the love and support of buddies, family and community; AND the lessons learned, ESPECIALLY from octopuses.

What essential life lessons have I learned from them?

  1. Do not fear what may look foreign;
  2. Respect alternative intelligences;
  3. If necessary, blend in to escape detection;
  4. When you know what you want, hold on tight;
  5. Trust in your ability to squeeze through tight spaces and come out okay on the other side;
  6. Ink out the negative in your life and jet away, leaving it behind you;
  7. Know your home and keep the garbage outside; and
  8. Be big-hearted (octopuses have three), guard the next generation, and use your beak when needed!

And what’s going on in this photo? All is told about my buddy, this female Giant Pacific Octopus, and the Copper Rockfish (see him/her?) in my blog “Gentle Giants. What to do when you find your dive buddy with a Giant Pacific Octopus on her head“.

And thankful for YOU that you care enough to read this blog and help make my efforts feel so worthwhile. I’ll stay at it till I am an octogenarian (and beyond).

Eight-Legged Dive Buddy

Yesterday . . .  Browning Wall off NE Vancouver Island  . . . . . a few minutes in my life.

A few minutes that fuels me in a way that I can never fully express. It’s why I have to take pictures.

And by sharing, I hope the NE Pacific Ocean opens up to more people; that there is more awareness of our marine neighbours and our connection to them.

They’re living their lives just below the surface, most often hidden in the dark planktonic soup that sustains them. We humans are most often on the other side; living our lives too often in the dark about our connection to them and how we are also dependent on Mother Ocean as the life sustaining force on the planet.

It’s a world of colour, mystery, marvel and surprise.

Okay, that’s enough words. Here are the photos of a few minutes in my life where I was graced by the presence of marine royalty.

We were ascending slowly to our safety stop (scuba divers spend at least 3 minutes at 5m/15′ to offload nitrogen). On the way, at around 10m depth I stopped, striving to “capture” the beauty of the fish with the surface of the Ocean visible above them.

The view at about 8 metres . ©Jackie Hildering.

The view at about 10 metres . ©Jackie Hildering.

I was smiling at the China Rockfish and Puget Sound Rockfish using the sponge as a couch. Here’s a close-up.

A sponge couch for these fish. ©Jackie Hildering.

See the Puget Sound Rockfish’s head poking out between the sponges? ©Jackie Hildering.

I looked to the right and saw that I was being watched. There, fully out in the open was a Giant Pacific Octopus.

jackie-hildering-13796

Giant Pacific Octopus watching me. ©Jackie Hildering.

I stared in awe for a little bit and then had to proceed to my safety stop. I was accompanied by the octopus.

Eight-Legged Dive Buddy! ©Jackie Hildering.

Eight-Legged Dive Buddy! ©Jackie Hildering.

jackie-hildering-13799

Eight-Legged Dive Buddy walking to 5m depth beside me! ©Jackie Hildering.

Together, we advanced to 5m. S/he tolerating the flashing of my camera and me trying to find some balance between documenting this experience and living it.

When we reached safety stop depth, off the giant jetted into the depths. With the octopus having descended deeper into the Ocean in which its kind have lived for some 500 million years, this human needed to return to the environment of air where our ancestors strived to start walking upright only about 6 million years ago (with Homo sapiens only dating back ~200,000 years ago).

I was left at 5m depth with 3 minutes to think about the marvel of what had just happened and how I might make the experience count in some way.

This was the view.

View to the surface. ©Jackie Hildering.

View towards the surface. ©Jackie Hildering.

View towards the surface. ©Jackie Hildering.

Remarkable Giant Pacific Octopus + Wolf Eel Encounter

Trust me, you are going to love the video below!

Giant Pacific Octopus passing over a mature male Wolf Eel in his den. See video below. ©Jackie Hildering

Giant Pacific Octopus passing over a mature male Wolf Eel in his den. See video below. ©Jackie Hildering

It is one of the most remarkable encounters I have witnessed in all my dives.

It’s a fortunate enough thing to be able to watch a large Giant Pacific Octopus when it is hunting. In this encounter, the octopus passes directly over a mature male Wolf Eel in his den. THEN, a Decorator Warbonnet emerges as well.

It was an exciting day in this wonderful marine neighbourhood.

I hope this 3-minute clip allows you to share in the awe and excitement.

For me, this was the NE Pacific Ocean equivalent of seeing a giraffe, elephant and rhino in close proximity.

Video and photos contributed by dive buddies Katie Morgan and Diane Reid while on our trip with God’s Pocket Dive Resort.

  • For more information on Wolf Eels (including that they are not an eel at all), see my previous blog here.
  • For more information on Giant Pacific Octopuses, click here for previous blogs and here for a blog specifically on hunting in Giant Pacific Octopus.

Gentle Giants. What to do when you find your dive buddy with a Giant Pacific Octopus on her head.

Please note, I have shared our experience below to reduce the misunderstanding and demonization of octopuses NOT to stimulate diver attempts at interactions. What is described below was an unsolicited gift experienced by those with a very high level of dive experience; knowledge of octopuses (and dive buddy) behaviour; and solid safety protocols.


The Kraken?! Devilfish?!

Scary?! Dangerous?! Alien?

Suggest such things about a Giant Pacific Octopus to any scuba diver respectful of marine life who has had an encounter with one of these gentle giants, and there is going to be a very strong response shattering such mythology.

As it always goes, fear and mythology thrive where there is absence of knowledge.

Any negative encounters between divers and Giant Pacific Octopuses that I am aware of, result from divers manhandling them “insisting” on an encounter, or involve octopuses that are habituated as a result of being fed by humans.

©2015 Jackie Hildering

Giant Pacific Octopus, Copper Rockfish and dive buddy Natasha Dickinson.
Read about this remarkable encounter below. ©2015 Jackie Hildering

We, as divers, are so fortunate to come across Giant Pacific Octopuses in their world where they are invertebrate royalty. We are able to meet them on their turf, and thereby know how inquisitive and intelligent they are. We know they are mighty, highly adaptable predators.

And, we know too, when we look into their eyes, that observation and assessment is being reciprocated.

That preamble was necessary before sharing what happened today.

This did . . . .

©2015 Jackie Hildering

1. Dive buddy Natasha Dickinson during the remarkable Giant Pacific Octopus encounter.
See the Copper Rockfish too? ©2015 Jackie Hildering

I had been taking photographs of Lingcod males guarding their egg masses and noted that my dive buddy Natasha Dickinson was signalling me with her light, indicating that she had found something of particular interest.

I took a few more shots and then swam towards her and found . . .  my dive buddy with a Giant Pacific Octopus completely covering her face. Sorry that I missed that shot. I was so in awe of what I saw.

Natasha is an incredibly skilled and experienced diver with a deep respect for marine life. She was clearly not afraid, nor was the octopus.

Natasha had taken the precaution of putting her hand over the regulator in her mouth in case the octopus took an interest in that but otherwise, allowed her to explore.

©2015 Jackie Hildering

2. Natasha is also a master of facial expressions that relay 1000 words. ©2015 Jackie Hildering

I would learn later that, while waiting for me she had been watching the Copper Rockfish that you will see in all but one of the photos in this blog. This rockfish stuck very near the octopus. A buddy?  That I don’t know but escorting a Giant Pacific Octopus on the hunt is a really good strategy. As the octopus flushes out animals from under rocks with his/her arms, the rockfish can grab the prey that do not end up under the octopus’ mantle.

While observing the rockfish, the Giant Pacific Octopus had slowly advanced toward Natasha and she remained where she was, intrigued at what would happened and having a contingency plan.

©2015 Jackie Hildering

3. Octopus flashing white as it pulls on the clasp ©2015 Jackie Hildering

When I started to take photos the Giant Pacific Octopus gradually backed away but had taken a particular interest in a clasp at the end of a bungee cord on Natasha’s gear.

You can see how her arm was entwined around the cord and how there was some flashing of white in the skin. You can also see the Copper Rockfish!

©2015 Jackie Hildering

4. Pulling a little harder! ©2015 Jackie Hildering

©2015 Jackie Hildering

5. One of the photos that suggests this was a female.  ©2015 Jackie Hildering

I believe this octopus was a female, thanks to feedback I received from self-admitted Cephalopod Geek supreme, Keely Langford of the Vancouver Aquarium. Octopus males have a “hectocotylus arm”. In Giant Pacific Octopuses, it is the third arm on their right. The hectocotylus stores the spermatophores – packets of sex cells, two of which are handed over to a receptive female who stores them until ready to fertilize her eggs.

Having the good fortune to get photos of the right side of this octopus, particularly #5 and #7, allowed me to see that the top of third arm on the right is not differentiated and that therefore, this was a female.

©2015 Jackie Hildering

6. Just after letting go. ©2015 Jackie Hildering

Back to recounting our adventure . . . .

After about a minute or two of gently tugging on the bungee cord, Ms. Giant Pacific Octopus let go.

Natasha swam a bit further off, allowing me a few minutes to marvel and photograph this beauty – the Giant Pacific Octopus AND the Copper Rockfish.

©2015 Jackie Hildering

7. Another photo that allowed me a good look at the 3rd arm on the right. ©2015 Jackie Hildering

©2015 Jackie Hildering

8. Ms. Octopus with the Copper Rockfish particularly near. ©2015 Jackie Hildering

©2015 Jackie Hildering

9. At one point, she also slowly advanced towards me but when I retreated a bit, so did she. ©2015 Jackie Hildering

©2015 Jackie Hildering

10. Walking towards me.  ©2015 Jackie Hildering

When Natasha circled back, the octopus flashed a bit of white as you can see in the image below. Recognition?

We both found ourselves waving goodbye when we, regretfully, had to return to our terrestrial world.

©2015 Jackie Hildering

11. Giant Pacific Octopus, Copper Rockfish, Kelp Greenling and dive buddy. ©2015 Jackie Hildering

So what to do when you find a Giant Pacific Octopus on your dive buddy’s head? Observe, marvel, take some photos, share and maybe it can help dispel some of the mythology and vilification about these fabulous marine neighbours.

Eye-to-eye with a gentle giant. My peering into a Giant Pacific Octopus' den earlier this month (using a macro lens). ©Jackie Hildering

12.. Eye-to-eye with a gentle giant. My peering into a Giant Pacific Octopus’ den earlier this month (using a macro lens). ©Jackie Hildering

 

Giant Pacific Octopus Facts:

  • Enteroctopus dofleini is the world’s largest octopod species with the maximum records for size being 9.8 m from arm tip to arm tip and 198.2 kg.
  • Average life expectancy is only 3 to 4 years.
  • Like other octopuses:
    • They have a beak with venom, three hearts, blue blood, and their skin is capable of detecting chemicals (as our nose does).
    • While many sources report their having 9 brains, octopuses only really have one donut-shaped brain positioned around their oesophagus and then each of their eight arms has many neurons, this is referenced as “distributed intelligence”. Damir Allen explains at this source; “Think of it like a command centre and 8 independent soldiers. They all act semi-independently, and if separated from the main body they will continue to capture food and try to deliver it to a non-existent mouth.”
    • Their ink is not just a distraction for predators but contains the chemical tyrosinase which causes eye irritation and messes up the predators’ senses of smell and taste.
    • They are jet propelled and are capable of incredible camouflage where they can not only change the colour of their skin but also its texture to blend in with their surroundings.
    • They mate only once. From the Vic High Marine website regarding Giant Pacific Octopuses: “Females die directly after they have finished laying and guarding to their egg however males live a slightly longer time. Octopus reproduction starts when a male uses a specialized tentacle [sic, octopuses have arms not tentacles] to pass two spermatophores (sperm packages) to the female. Once given the sperm the female stores the package until she is ready to fertilize the eggs.  Before a female is ready to fertilize the eggs she has to find a suitable den. This search can take the future mother up to one month! Once the perfect place is found the female shuts herself in using rocks. From there she fertilizes each egg and gathers them in bundle of approximately 200. She hangs each group of eggs from the ceiling of the cave. This is a long process because, on average, a female octopus can lay up to 50,000 eggs.  The incubation time for octopus eggs are six and a half months.  During this time the female stays in the cave, not even leaving to eat, attending to the eggs by constantly blowing oxygenated water on to them. When the baby octopuses hatch they are referred to as paralave. These tiny juveniles swim up to the surface joining other zoo plankton and spending weeks feeding on tiny phytoplankton. Once they have developed enough mass they descend to the benthic zone.  As for the mother, she waits until all the eggs have hatched then emerges from the cave and dies shortly afterwards due to the starvation she endured during the months she spent devoted to tending her eggs.
  • Excellent on-line resources on octopuses.
  • Best book on Giant Pacific Octopuses –  The Giant Pacific Octopus and Other Cephalopods of the Pacific Coast by James A. Cosgrove and Neil McDaniel.
  • And the plural really is “octopuses” not “octopi”! See #3 at this link if you are doubtful.

Great thanks to Gwa’sala-‘Nakwaxda’xw Marine Services for making this dive possible.

Media coverage so thankfully resulting from this blog includes: