northern vancouver island | The Marine Detective

Posts tagged ‘northern vancouver island’

Breath-Taking Beauty . . . Orca Resting Lines

Of all the Orca behaviours I have been privileged to see, it is when they are in “resting lines” that I most transported into awe. It makes so clear how socially bonded the whales are and how coordinated their behaviours can be.

Northern Residents the A12s in a resting line in 2007.

Science has determined that toothed whales like Orca do not sleep but only “rest”, shutting off one half of their brains at a time (scientifically known as “unihemispheric sleep”). They have to maintain this level of brain activity since they are voluntary breathers and must therefore consciously come to the surface to inhale and exhale.

Occasionally, Orca rest alone. They then float on the surface, motionless, blowhole exposed, “logging” for only a few minutes.

Far more often the Orca rest together, uniting in these very tight groups, fin to fin. This can happen at any time of day and I have witnessed resting line behaviour for up to 8 hours.

Northern Residents the A34s (A12s daughter and offspring) resting in 2017.

Once in resting line formation, the whales are usually silent (although there are a couple of matrilines that do occasionally vocalize) and move slowly forward, undertaking a remarkably synchronous and regular dive pattern. They often take short, shallow dives for around 2 minutes and then they all take a longer dive. When they resurface, their breaths are incredibly coordinated and their dorsal fins often line up perfectly.They are of course particularly susceptible to disturbance by boats when they are resting – both due to sound and proximity.

“We are one” the behaviour seems to display and I certainly believe that this resting is also of great social and cultural importance to Orca.

At its most simple level though, a resting line of Orca is truly . . . breath-taking beauty.

Photos below = resting line of members of the D, C, A5 and I15 matrilines in August 2020. All photos taken with a telephoto lens.

Super Mom! Up to 300 young under her care.

This is a Brooding Anemone (Epiactis lisbethae to 8 cm across).

She may not have a backbone but she’s a Super Mom!

As many as 300 young can be clustered around her in up to 5 rows, benefitting from the protective canopy of her tentacles which contain stinging cells (nematocysts). The offspring remain here until big enough to stand a good chance of surviving on their own. They then crawl toward independence, claiming their own piece of the ocean bottom.

Note: This blog was initially published in 2013. Reposting for Mothers Day 2020.

I am awestruck by this species’ beauty and reproductive strategy. It is also a reminder of how little we know about marine species that the Brooding Anemone was not recognized as a distinct species until fairly recently (1986), and it still so often gets confused with the Proliferating Anemone (Epiactis prolifera).

I share my marine “detectiving” about this species with you to provide a further example of how extraordinary our marine neighbours are and maybe, thereby, help inspire greater conservation efforts.

But yes, the timing of the blog is no accident. It may be that reflection upon an anemone Super Mom stimulates thought about our human mothers – just in time for Mother’s Day.

So here goes . . . bear with me as I build to clarifying the reproduction of our featured species.

Anemones have many reproductive strategies.

For many species, reproduction can be asexual as well as sexual with strategies like budding off offspring; splitting into two; or pedal laceration where a torn piece of the bottom of the anemone can grow into another anemone!

Some species are hermaphrodites with highly diverse ways by which offspring develop into adults.

In species that have separate sexes, many are broadcast spawners where Mom and Dad release their eggs and sperm into the ocean around them. Fertilization and development thereby happens in the water column.

Then, for only some 20 species of the world’s more than 800 kinds of anemone, there are those in which the female captures the males’ sex cells as they drift by and draws them into her digestive cavity to fertilize her eggs. She “broods’ her young.

Some such anemone species are internal brooders. The young develop inside Mom until they hatch and are expelled into the water column as planktonic larvae.

But then there’s Super Mom – the Brooding Anemone (Epiactis lisbethae). She’s an external brooder.

After she has fertilized the eggs inside her digestive cavity with the sperm she has captured, the young develop inside her until they hatch into planktonic larvae. THEN, they swim out of her mouth, settle on her body under the tentacles and grow into little anemones that feed themselves.

When the offspring are big enough to stand a good chance of survival without the protection of Mom’s tentacles, they shuffle away to independence, leaving space for next season’s young.

The brooding anemone’s young are all of the same generation and are therefore all about the same size.

However, there is a second externally brooding anemone species in the eastern North Pacific where you most often see young of different sizes huddled under Mom’s tentacles. This species – the Proliferating Anemone (Epiactis prolifera) is the one that very, very frequently gets confused with the Brooding Anemone.

Proliferating Anemone with young (Epiactis prolifera). Often confused with the Brooding Anemone (Epiactis lisbethae).

I have strived to clarify the many differences between these two externally brooding anemone species in the table below but to summarize: the Proliferating Anemone is smaller and does not have striping all the way down the column; adults are hermaphrodites; breeding happens year round; there are far fewer young clustered under mom’s tentacles; and they start off there as fertilized eggs, not as free-swimming larva.

The main similarity between these two species is and yes, I am going to use a tongue twister here since I believe it is inevitable when discussing anemones: with anemone mothers like these, baby anemones are protected from their anemone enemies!

Now off you go, share some ocean love with a Super Mom!

There are so many human females out there worthy of awe.
Where, were we to consider how many young they have shielded and helped to independence, the number might well be 300 or more.

Click to enlarge. Table summarizing the differences between Brooding and Proliferating Anemones.

Brooding anemone with young (Epiactis lisbethae) - all the same age. ©2016 Jackie Hildering.

long-horizontal-001

Sources:

- Bucklin, A., D. Hedgecock, et al. (1984). Genetic evidence of self-fertilization in the sea anemone Epiactis prolifera. Marine Biology 84(2): 175-182
- Edmands, Suzanne, 1995. Mating systems in the sea anemone genus Epiactis. Marine Biology 123: 723-733
- Encyclopedia of Life – Epiactis lisbethae
- Encyclopedia of Life – Epiactis prolifera
- Fautin, Daphne G and Chia, Fu-Shiang, 1986. Revision of sea anemone genus Epiactis (Coelenterata: Actiniaria) on the Pacific coast of North America, with descriptions of two new brooding species. Canadian Journal of Zoology 64:8 1665-1674
- Sept, Duane; The Beachcombers Guide to Seashore Life in the Pacific Northwest
- Snail’s Odyssey – Anemone asexual reproduction
- Snail’s Odyssey – Anemone sexual reproduction
- Wallawalla.edu Epiactis lisbethae

Lessons Learned from Whales: Be a “Killer” Female

Three “disclaimers” before sharing one of the very valuable lessons I have learned from whales.
1) For the purposes of this blog, I am referencing the world’s biggest dolphin as both “Orca” and “Killer Whales”. Please know that “Orcinus orca” only camouflages our branding and past misunderstanding of the species as it roughly translates into “demon of the underworld”. Clearly the species did not name itself.

2) When referencing being a “killer” female it is as per this definition: Killer: adjective slang: highly effective; superior; cool; awesome; really badass. I do NOT want to playing into jokes about female rage, especially for those women going through menopause.

3) If you think you’ve read or heard similar content from me before, you’re right. I reference this lesson in presentations and I wrote a similar blog 10 years ago. I am reviving it for International Woman’s Day 2020. I am reviving it because this lesson is of even more value to me now that I am a decade older.

Now here goes . . .

The most valuable lessons I have learned about being female, I have learned from Killer Whales / Orca. For example, it is through my knowledge of these highly cultured whales that I know Nature’s plan for older females.

Let’s face it, human society does not generally help in this regard. As time etches lines into our interiors and exteriors – society does not tell us we are a-okay! No, the general messaging is about loss, faded youth and endings. Firm up! Dye that hair! Want some Botox baby? We’re sweeping you aside, ‘cause you’re old!

Thank goodness I believe in Mother Nature.

One of my teachers – A12 aka “Scimitar”; born around 1941 and now passed away. She was a Northern Resident (inshore fish-eating) Orca who was the grand dame of the A12 matriline.

As I weather the physiological and psychological changes of age, I know there is purpose in all this. Humans and Killer Whales are among the very few animal species where females go through menopause; where they can live beyond their child-bearing years as “post-reproductive females”.

In the case of Killer Whale females, they can give birth between the ages of around 12 to 40 but can live to at least age 80 (life expectancy is not yet certain since Killer Whales have only been studied as individuals since 1973). Thereby, female Killer Whales may live almost twice as long as they have babies. On the face of it, this appears to violate one of Mama Nature’s great laws. That is, if you’re going to use our food, you better pass on our genes.

But Nature makes sense. Therefore, the role of post-reproductive females must be so valuable that it “justifies” their using the population’s resources.

Science in fact believes that the old female Killer Whales are the teachers and decision-makers. These grandmas, wizened by their years and the lessons of the generations before them, are believed to teach mothering skills; how and where to hunt; and they are known to share food, especially with their eldest son. These activities would benefit the population by ensuring that the offspring are better able to survive and mate . . . passing on shared genes. Since first posting this blog a decade ago, there has been further science published on this. Please see sources below.

The role of the older females has been acknowledged in science with the convention being that each family group of Killer Whales is named for the eldest female (e.g. the A12s). Also, the collective name for a group of Killer Whales is “matriline” which loosely translates into “follow your mother”.

Female Killer Whales have taught me that I am not less as I age but rather that there is teaching to be done and leadership to be embraced.

Never in the history of humankind have the females of our species had access to the resources we have now. It’s far from equality BUT imagine, imagine my sisters (and brothers) if instead of being manipulated by a paradigm that is aimed at making us feel less, we chose to be more. Think of how we could unite against inequality in its many forms.

Instead of absorbing, and perpetuating, disempowering messaging about being older, imagine a world where older woman rise into their potential. What a force that would be for the DNA of our kind – not distracted by what is not, but working for what will be.

These years are to be lived . . . as a killer female.

Another one of my teachers – A30 aka “Tsitika” with one of her sons, A39 “Pointer” in 1999.
©Jackie Hildering.

Photo by “Sealives” from 2018.

Me. Age 58. [Updated August 2021].

Where once I had rapid access to a brain full of facts, I now have intuition.

Where once I had 20/20 vision, the lenses of my eyes have become far less flexible. But, I see more.

Where once I was rubbed raw by society’s perceptions of success as a woman, I have (largely) found my way.

Where once I fought my body, I have healed into gratitude for its strength and health; the life it lets me live and how it is the manifestation of the DNA of those before me.

Where once I was unlined, I am weathered. The lines are getting deeper and more abundant, revealing that as I age, I laugh more – openly and loudly – and hide my emotions far less.

Where once I felt I had to prove I could do it all alone, a gift of age has been to reach out to younger generations. Their skills and values help me. My skills and values are aimed at being in service to them.

Where once I was constricted by messaging of being “too much” and wanting “too much”, I recognize the power structures and motivations of those wanting to keep others small, so that they may feel big. I know what motivates inequality and injustice. I know. Thereby, I have power; the power to help those who have less.

Research on menopause in Killer Whales

Croft, D. P., Ellis, S., Brent, L. J. N., Johnstone, R. A., Nattrass, S., Franks, D. W., Mazzi, S., … Cant, M. A. (January 23, 2017). Reproductive Conflict and the Evolution of Menopause in Killer Whales. Current Biology, 27, 2, 298-304.
Foster E.A., Franks D.W., Mazzi S., Darden S.K., Balcomb K.C., Ford J.K.B., Croft D.P.Adaptive prolonged postreproductive life span in killer whales. Science. 2012; 337: 1313
Lauren J.N. Brent, Daniel W. Franks, Emma A. Foster, Kenneth C. Balcomb, Michael A. Cant, Darren P. Croft. Ecological Knowledge, Leadership, and the Evolution of Menopause in Killer Whales. Current Biology, 2015
Nielsen, M. L. K., Ellis, S., Towers, J. R., Doniol‐Valcroze, T., Franks, D. W., Cant, M. A., Weiss, M. N., … Croft, D. P. (June 16, 2021). A long postreproductive life span is a shared trait among genetically distinct killer whale populations. Ecology and Evolution.

Decorator Crabs! The best-dressed in the NE Pacific Ocean.

Are you ready? I’ve been collecting these photos for a long time. Now, finally, I think I have enough to deliver this marine fashion show to you – the best dressed of the NE Pacific Ocean!

Decorator crabs are camo-crabs. They pluck bits of life from their surroundings and attach it to themselves. AND, if their surroundings change, they change their outfit.

Graceful Decorator Crab covered with hydroids including the “Raspberry Hydroid” which was only recognized as a new species in 2013 with the area near Telegraph Cove (Weynton Pass) being one of the few areas these colonies are known to live. ©Jackie Hildering.

This is highly functional fashion. Not only does this covering of life allow the crabs to hide from potential predators, it also apparently changes the way the crabs feel and taste in a way that deters their predators. Sponges taste bad or are even toxic to many predators and animals like hydroids and other “cnidarians” have stinging cells. Thereby, if you cover yourself with sponges or cnidarians, predators be gone!

Indeed, even though decorator crab species look like walking gardens, often what they attach are not algae but other animals – hydroids, sponges and bryozoans.

Additional bonuses of carrying other organisms on your back may be:

You have potential snacks within a pincher’s reach.
Your camouflage allows you to get closer to your prey.
You are carrying weapons!

From A Snail’s Odyssey: “Apart from passive camouflage from potential predators, other functions of the behaviour may include disguise for closer approach to prey, and provision of tools for active defense, such as a branches of hydroids containing functional stinging cells or pieces of sponges or tunicates containing toxic chemicals.”

Graceful Decorator Crab with snippets of sponge attached to his/her carapace (Hooded Nudibranchs in the background). This individual realized it had been seen and switched to the defence strategy of looking big since “so many fish predators are limited by the size of their mouths” (Source: Crabs and Shrimps of the Pacific Coast); ©Jackie Hildering.

Note too that not all growth on the back of crabs is the result of decorating and remember that crabs moult, crawling out the back of their shells in order to grow. Also from A Snail’s Odyssey: “In some cases these camouflagings result from settlement of spores and larvae . . . . Passive buildup of growths is greater with increasing age as moulting frequency decreases. Also, in many species there is a final or terminal moult which, if the species’ exoskeleton is receptive to settlement of larvae and spores, leads to an even greater build-up of cover.”

Graceful Decorator Crab adorned with (and atop of) Glove Sponge. ©Jackie Hildering.

“Spider crab” (superfamily Majoidea) species are the ones that most often adorn themselves. From Greg Jensen‘s Crabs and Shrimps of the Pacific Coast: “Many spider crabs . . . mask themselves with algae or encrusting organisms so that they can hide in plain sight. The decorator crabs are equipped with curved setae much like the hook part of Velcro fasteners: after shredding material a bit with their mandibles, they press it into place. The largest species tend to stop actively decorating once they outgrow most of their predators.”

Crab predators include the Giant Pacific Octopus and fish species like Cabezon, some rockfish, Surfperch, Wolf-Eel and the Staghorn Sculpin. Of course, at low tide, birds and mammals are also predators.

Hoping this adds to the wonder, connection and respect for our marine neighbours. Enjoy the rest of the show!

[For research on decorator crabs with great diagrams explaining how how attachment occurs see this link.]

Try not to smile!

Another Graceful Kelp Crab adorned with Raspberry Hydroids.

Here you can even see where the Graceful Decorator Crab has clipped off bits of sponge. AND s/he’s in the act of attaching clippings. ©Jackie Hildering.

Longhorn Decorator Crab. ©Jackie Hildering.

Heart Crab (I THINK) – not likely to have decorated itself but rather this is the result of the settlement and accumulation of organisms = a walking ecosystem. ©Jackie Hildering.

Graceful Kelp Crab with adornment of Sea Lettuce. ©Jackie Hildering

Graceful Decorator Crab in front of a Painted Sea Star. S/he had just moved from being camouflaged among kelp to moving in front of the sea star. ©Jackie Hildering.

This Graceful Decorator Crab has adorned him/herself with bits of Barnacle Nudibranch egg masses for camouflage. You can see the egg masses behind the crab.

Decorator crab species in the NE Pacific Ocean include:

Graceful Decorator Crab – Oregonia gracilis
Graceful Kelp Crab – Pugettia gracilis
Longhorn Decorator Crab – Chorilia longipes
Other species too will sometimes put a bit of camouflage on their rostrum e.g. Northern Kelp Crab – Pugettia producta

Sea Angels and Sea Butterflies?!

My dry suit has been hosed down and is drying in the sun; my regulator is soaking in fresh water; the washing machine is chug chug chugging with the clothes used over the last days of diving; and my head and heart are full of so much I want to share.

I’m back from another trip organized to God’s Pocket Dive Resort just beyond Port Hardy . . . more than 11 hours spent underwater over the last days. Such an escape. Such an immersion in wonder and that sense of humility that comes with submerging in the force that sustains this planet. Such an opportunity to learn.

I saw my first Sea Angel.

My buddy and I had been drifting along for about an hour. We had schooled with rockfish; hung next to Orange Sea Pens as they bowed in the current; and marvelled at the abundance of anemones and their babies, studding the forests of kelp. We had done our safety stop with a seeming snowfall of pulsing Aggregating Jellies streaming down around us in the sun’s beams.

Thousands of Aggregating Jellies aka Umbrella Jellies. Eutonina indicans to 3.5 cm across. Collective noun for jellies is "smack". ©2016 Jackie Hildering.

Thousands of Aggregating Jellies also known as “Umbrella Jellies”. Eutonina indicans to 3.5 cm across.
Collective noun for jellies is “smack”. ©2016 Jackie Hildering.

Close-up on Aggregating Jelly aka Umbrella Jelly. Eutonina indicans to 3.5 cm across. ©2016 Jackie Hildering.

Close-up on Aggregating Jelly – Eutonina indicans to 3.5 cm across.
©2016 Jackie Hildering.

We had already been further awed by Sea Butterflies “flying” by our masks. Sea Butterflies are planktonic sea slugs! They are “pteropods” – swimming shell-less molluscs whose “wings”(ptero) are their feet (pods). This genus does have an internal gelatinous “pseudoconch” (false shell) and the brown dot you see in my image is the gut. Sea Butterflies feed by forming a mucus web up to 2 m in diameter in which they trap smaller plankton and bits of organic matter. Oh to see that. It was apparently first documented in the 1970s by researchers while SCUBA diving.

Sea Butterfly - Corolla spectabilis. Dark spot is the gut. ©2016 Jackie Hildering.

Sea Butterfly – Corolla spectabilis. Dark spot is the gut. See this link for more species information and a video (with excited diver vocals) of a swimming Sea Butterfly.

All those jellies and Sea Butterflies pulsing around us and then, just when I was about to break the surface back into the world where gravity has such a stronger hold on me, I saw it! So small, tiny wings pulsing . . . a Sea Angel!

Image #1 of the Sea Angel – Cliopsis krohni to 4 cm long. Also known as a “Sea Cherub”.
©2016 Jackie Hildering.

Image #2 of the Sea Angel. ©2016 Jackie Hildering.

Image #3 of the Sea Angel. ©2016 Jackie Hildering.

This is another species of planktonic, “winged” sea slug (but the adults of this species are completely shell-less; they do not even have pseudoconch). Sea Angels are a rarity so far to the north and are only occasionally seen at the surface (found to depths of 1.5 km). Their presence is likely due to warmer waters (El Nino and possible climate change) and a big northwest wind that had raged a couple of nights prior. The wonder of it, to see something so otherworldly, to know of its rarity in this area, and to get a sense of its planktonic fragility – surviving from a larval stage, escaping predation by fish, and to be carried by the currents in the vastness of the sea.

It may be hard to imagine but this species is a voracious predator! Cliopsis feeds on other planktonic snails by grabbing them with a long proboscis (which can be up to two times its body length), a sharp radula and hooks made of chiton!

Screen grab from the "Plankton Chronicles" showing a Sea Angel feeding! See amazing 1.5 min clip here http://planktonchronicles.org/en/episode/pteropods-swimming-mollusks/.

Screen grab from the “Plankton Chronicles” showing a Sea Angel feeding!
See amazing 1.5 min clip at this link.

And yes, their diet includes Sea Butterflies. Sea Angels can eat organisms up to three times their size!

When a Sea Angel comes into contact with a Sea Butterfly’s feeding web, it reels it in, dragging the Sea Butterfly with it. When close enough, the Sea Angel then uses its probosis to “cut” the Sea Butterfly from its psuedoconch and eats it.

The marvel of it all, the delicate balance of this planktonic world about which so few of us have knowledge but which can be so impacted by our activities. There is concern about the impact of ocean acidification (caused by our carbon use) on the development of these organisms.

As always, don’t be despondent. See the beauty, know your connection, and recognize the common solutions and great gains of caring more . . .. and consuming less.

And They Spread Their Giant Wing-Like Fins . . .

TMD Memes.001

And they spread their giant wing-like fins . . . and returned from the brink.

The whales remind us of our great capacity for positive change . . . when our value systems change and knowledge, connection and humility replace fear and misunderstanding.

The simple solution? Care More. Consume Less.

There are still so many ways to indirectly kill a whale and damage the life-sustaining seas upon which we all depend.

Image is of “Jigger” the mature female Humpback Whale who breached for 18 minutes. More images below.

You simply can’t be the same after seeing something like this, nor would I want to be.

What triggered this behaviour may have been an encounter with another Humpback (“Slash” BCX0177″) but we cannot know for sure.

For the work of our Marine Education and Research Society, please see here and yes, you can support our work by sponsoring a Humpback Whale!

Remarkable Giant Pacific Octopus and 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

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.

Underwater Smoking Log and the Worm That is Not a Worm?

Submerging into the dark, you never know what you are going to see.

It is a large part of what is so intoxicating about diving in cold, dark waters – all the mystery; all the wonder; all the opportunity for learning and sharing.

So what was it today?

This – a smoking log at about 6 m depth!

Teredo navalis spawning. March 8, 2015 ©Jackie Hildering.

Northwest Shipworms spawning. March 8, 2015 ©Jackie Hildering.

The “smoke” was brief but intense and of course it was not smoke at all. It was the spawn of some animal. Many marine invertebrates are broadcast spawners where all individuals in an area release their sex cells at the same time to enhance the chances of fertilization.

I knew the source of the “smoke” had to be a shipworm species since it was coming from a rotting log with lots of tunnels bored into it. I then had to do a bit of reading to be sure of whether it was the invasive Naval Shipworm (Teredo navalis), or the indigenous Northwest Shipworm (Bankia setacea).

Either way, shipworms are not worms at all!

Northwest Shipworm Source: MARINE WOOD BORERS IN BRITISH COLUMBIA; D. B. Quayle; 1992

Shipworms are saltwater clams. They look like a worm in a calcareous tube but have two small shells at the front of their bodies that are specialized to bore through wood, much to our dismay! The clams also have symbiotic bacteria that release an enzyme to help break down the cellulose in the wood.

I believe in this case it was the Northwest Shipworm that was spawning and the initial cue for the synchronous release of sex cells in this species is believed to be a sudden change in temperature or salinity. Once the spawn begins, it is believed that neighbouring Northwest Shipworms drawing water into their siphons detect the spawn and that this further triggers them to release their sex cells.

The Northwest Shipworm it is more common in BC than the Naval Shipworm; the tunnels in the wood looked like those caused by this species; but also relevant in my knowing it was this species is that I saw eggs being released as well as sperm.

With the oh-so-successful Naval Shipworm that originated in the Atlantic but is now boring through wood in all the world’s oceans, only the males release sex cells. Sperm are then drawn into females’ inhalant siphons; the eggs are fertilized and develop in the female’s gills in huge numbers to be released as free-swimming larvae.

Northwest Shipworms spawning. The white material on the logs is known as “frass”- waste discharged through the clams’ excurrent siphons. March 8, 2015 ©Jackie Hildering.

The Northwest Shipworm does not have this reproductive strategy. With both genders broadcast spawning, you can imagine how many sex cells need to be released for successful reproduction.

After about 3 weeks (at 12 – 15°C), the Northwest Shipworm larvae appear to be able to detect wood. They attach themselves, soften the wood, bore into it, develop into adults and cause economic discontent in we humans. This is especially the case in the logging industry which depends on transporting and storing wood in the Ocean.

Apparently the Northwest Shipworm can burrow 10 cm per month at temperatures greater than 10°C. See here for examples of the damage to wood by this species. If you are a Northern Vancouver Islander, you can see how this wood has been used as a decorative wall covering in the Whale Interpretive Centre.

For me, there was no discontent today. It was a wonder to be swimming by at the exact time this species was spawning. Providing me with a further opportunity to . . . smoke out facts about our marine life and share them with you!

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.

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 . . . .

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.

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.

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!

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.

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.

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.

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.

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.
- A Snail’s Odyssey – Learn About Octopus. Includes excellent information on reproduction in Giant Pacific Octopuses.
- Berkley – The Cephalopoda – Squids, octopuses, nautilus, and ammonites. Includes an explanation of why octopuses have “arms” (non-retractable) not “tentacles” (retractable).
- http://scubadiverlife.com/2014/01/15/the-giant-pacific-octopus/
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:

Earth Touch News; 2015-02-26; “What to do when an octopus gives you an eight-armed face hug“
Global News TV interview (video); 2015-02-25 – “Encounter with a Giant Octopus“
Global News; 2015-02-25; “WATCH: Local diver’s encounter with a giant octopus goes viral”
Huffington Post; 2015-02-24; “Giant Octopus, Diver Encounter Shows Nature Of ‘Gentle Giant’: Biologist“
CTV News TV interview (video); 2015-02-24; “Gentle hug from octopus“
CTV News; 2015-02-24; Deep-sea hug: Giant octopus wraps around diver’s face near Vancouver Island

Otherworldly Drifter. Mind Blown.

Today was the first time ever that, while diving, I made a gesture to my dive buddy indicating that my brain had exploded.

We weren’t deep; the remarkable find that had me awestruck was at 3 to 5 metre depth. It’s a known species and is found throughout the Atlantic, Pacific and Indian Oceans but . . . . it’s certainly extremely rare here around NE Vancouver Island and it is SO otherworldly.

Let me take you on a short journey of discovery.

I was already pretty excited when I found the organism in the photo below. I knew it to be a salp “aggregate” and was delighted that there was an amphipod hitchhiker. See it?

Cyclosalpa bakeri with amphipod hitchhiker ©Jackie Hildering; www.themarinedetective.ca

Salps are such unique gelatinous animals! They belong to the group of highly evolved invertebrates known as tunicates. Most tunicate species live attached to the bottom when they are adults but salps remain Ocean drifters for their whole lives. Because of their gelatinous “tunic” they have even been referred to as Ocean Gummy Bears.

Their reproduction is totally otherworldly! They alternate between two forms. The image above is of the “aggregate” form or “salp chain” that, dependent on species, can be made up of millions of individuals. The aggregate form reproduces sexually to form a barrel-shaped solitary form. The solitary form buds off (asexually) to produce the individuals that make up the aggregate form and so on! Salps apparently grow faster than any other multicellular organism! (Source: JelliesZone).

Back to the dive . . . so I was already pretty thrilled to have seen the salp chain of this unique species and was taking the photo below of an Alabaster Nudibranch (because you can NEVER have enough photos of Alabaster Nudibranchs) . . . .

Alabaster nudibranch. Dirona albolineata to 18 cm aka “white-lined dirona” or “frosted nudibranch”. ©2015 Jackie Hildering

. . . . and then I saw something hovering above me, zeppelin like.

Brain exploded. WHAT was this?!

Pelagic tunicate. Salp species - Thetys, solitary phase. To 33 cm. ©2015 Jackie Hildering

It was about 25 cm long.

It had openings on both ends.

It clearly had internal organs.

And it had unique projections on what I assumed was its back end.

The look on my dive buddy Natasha Dickinson’s face in the image below says it all!

Dive buddy with Thetys. ©2015 Jackie Hildering

I was pretty sure that it was the solitary form of some species of salp but . . . so big?

As soon as I got home I grabbed my copy of Wrobel and Mills’ “Pelagic Coast Pelagic Invertebrates” and emailed a few photos of this unique find to Andy Lamb, co-author of Marine Life of the Pacific Northwest.

Ahh – it’s wonderful to have friends in deep places. Andy came back very quickly with the ID. It was a salp indeed, in fact, the world’s biggest. Thetys* in the solitary form can grow to 33 cm!

From Dave Wrobel’s The JelliesZone webpage: “Thetys is truly an impressive member of the zooplankton. It is the largest species of salp along the West Coast and is relatively easy to distinguish from all others. Unlike most gelatinous animals, the body is relatively firm due to the thick spiny test (the test, or tunic, is the hard outer covering typical of many tunicates, hence the name for the group). It retains its shape even when removed from the water. Solitary individuals have 20 partial muscle bands . . . that are used for constricting the body while pumping water for feeding and locomotion. A pair of pigmented posterior projections are very distinctive, as is the darkly colored, compact gut . . . Like other salps, Thetys continuous pumps water through a mucous net to extract phytoplankton and other small particles. Although relatively uncommon in Monterey Bay [and therefore very uncommon so much further north where I sighted this individual], this widespread species can be found in temperate and tropical waters of the Pacific, Atlantic and Indian Oceans, to depths of about 150 meters.”

I was intrigued how an animal that lives in the open Ocean and depends on plankton could be so big?

How could it filter enough plankton out of the water?

I came upon research from MIT (2010) that revealed how salps could get enough nutrients to be so big and fast growing. Their mucus nets are astounding in how they are able to trap incredibly small-sized plankton. With this find, the researchers referenced salps as “the vacuum cleaners of the ocean” and confirmed how important they are because of what they do to huge volumes of climate-changing carbon.

In the Oceanus Magazine article Salps Catch the Ocean’s Tiniest Organisms, the researchers explain “As they eat, they [the salps] consume a very broad range of carbon-containing particles and efficiently pack the carbon into large, dense fecal pellets that sink rapidly to the ocean depths, Madin said. “This removes carbon from the surface waters,” Sutherland said, “and brings it to a depth where you won’t see it again for years to centuries.” And more carbon sinking to the bottom reduces the amount and concentration of carbon in the upper ocean, letting more carbon dioxide enter the ocean from the atmosphere, explained Stocker” [thereby reducing the amount in the atmosphere where it impacts climate.]

I of course also hoped to find a good photo or video of the salp chain of this species (the aggregate form) and came upon this 1-minute clip by Patrick Anders Webster (taken off the coast of central California).

Wow!!! Mind-blown again.

And below, an additional video from Patrick from May 2016, also off the coast of California.

[*You may have noticed that the full scientific name for this tunicate species is Thetys vagina as assigned by the German naturalist Wilhelm Gottlieb Tilesius von Tilenau in 1802. Likely at that time, “vagina” did not yet have its anatomical meaning and the species name was chosen for the Latin origin of the word meaning “wrapper” / “sheath”.]

Further information:

Scripps zooplankton guide – https://scripps.ucsd.edu/zooplanktonguide/species/thetys-vagina

Jelly Zone – http://jellieszone.com/pelagic-tunicates/thetys/