Join me in the cold, dark, life-sustaining NE Pacific Ocean to discover the great beauty, mystery and fragility hidden there.

Posts from the ‘MARINE MEGAFAUNA’ category

The Creature Below the Floathouse?

How I enjoyed receiving the following mystery this week.

Be sure to have your sound on when you read and listen to the clip below.

Yes, it’s a male Pacific Harbour Seal! So many people do not realize that the male Harbour Seals establish and defend territory in the water (unlike species of sea lion and elephant seal who defend territory on land).

From Discovery of Sounds in the Sea . “Harbor seals were thought to be the least vocal of the pinnipeds. Recent studies have shown, however, that males produce underwater vocalizations during the mating season to attract females or to compete with other males. Males establish territories in the waters offshore of haul-out sites. Using underwater vocalizations, they defend their territories against other males and display to females traveling through the area. Their underwater vocalization is described as a roar with a peak frequency at approximately 1.2 kHz. Harbor seals also produce a wide variety of in-air vocalizations, including short barks, tonal honks, grunts, growls, roars, moans, and pup contact calls.”

It is remarkable isn’t it that these sounds were not known to be made by male Harbour Seals until ~1994.? This is the most common marine mammal on so many coasts and yet . . . we know so little.

Note: The person who sent me the mystery preferred to remain anonymous and that the location of the recordings not be provided. I can share that it was in the Sunshine Coast area of British Columbia. However, this underwater sound could be from ANYWHERE male Pacific or Atlantic Harbour Seals wish to pass on their genes. 🙂

See below for some of the research into Harbour Seal vocalizations.


From the research of Leanna Matthews:

“Similar to other aquatically mating pinnipeds, male harbor seals produce vocalizations during the breeding season that function in male-male interactions and possibly as an attractant for females. I investigated multiple aspects of these reproductive advertisement displays in a population of harbor seals in Glacier Bay National Park and Preserve, Alaska. First, I looked at vocal production as a function of environmental variables, including season, daylight, and tidal state. Vocalizations were highly seasonal and detection of these vocalizations peaked in June and July, which correspond with the estimated time of breeding. Vocalizations also varied with light, with the lowest probability of detection during the day and the highest probability of detection at night. The high probability of detection corresponded to when females are known to forage. These results are similar to the vocal behavior of previously studied populations.

However, unlike previously studied populations, the detection of harbor seal breeding vocalizations did not vary with tidal state. This is likely due to the location of the hydrophone, as it was not near the haul out and depth was therefore not significantly influenced by changes in tidal height.

I also investigated the source levels and call parameters of vocalizations, as well as call rate and territoriality. The average source level of harbor seal breeding vocalizations was 144 dB re 1 μPa at 1 m and measurements ranged from 129 to 149 dB re 1 μPa. Analysis of call parameters indicated that vocalizations of harbor seals in Glacier Bay were similar in duration to other populations, but were much lower in frequency.

During the breeding season, there were two discrete calling areas that likely represent two individual males; the average call rate in these display areas was approximately 1 call per minute.

The harbor seal breeding season also overlaps with peak tourism in Glacier Bay, and the majority of tourists visit the park on a motorized vessel. Because of this overlap, I investigated the impacts of vessel noise on the vocal behavior of individual males. In the presence of vessel noise, male harbor seals increase the amplitude of their vocalizations, decrease the duration, and increase the minimum frequency. These vocal shifts are similar to studies of noise impacts on other species across taxa, but it is unknown how this could impact the reproductive success of male harbor seals.

Finally, I looked at the role of female preference for male vocalizations. Using playbacks of male vocalizations to captive female harbor seals, I found that females have a higher response to vocalizations that correspond to dominant males. Females were less responsive to subordinate male vocalizations, which had a shorter duration and a higher frequency. Given that male harbor seals decrease the duration and increase the frequency of vocalizations in the presence of noise, it is possible that these vocalizations become less attractive in noise.


Click here for Harbour Seal vocal samples from Discovery of Sound in the Sea.

Sources:

Discovery of Sound in the Sea (DOSITS) – Harbor Seal Sounds (Phoca vitulina).

Hanggi, E. B., & Schusterman, R. J. (1994). Underwater acoustic displays and individual variation in male harbour seals, Phoca vitulina. Animal Behaviour, 48(6), 1275–1283. 

Matthews, Leanna. (2017). Harbor Seal (Phoca vitulina) Reproductive Advertisement Behavior And The Effects Of Vessel Noise. SURFACE.

Nicholson, T. E. (2000). Social structure and underwater behavior of harbor seals in southern Monterey Bay, California.

Sabinsky, P. F., Larsen, O. N., Wahlberg, M., & Tougaard, J. (January 01, 2017). Temporal and spatial variation in harbor seal (Phoca vitulina L.) roar calls from southern Scandinavia. The Journal of the Acoustical Society of America, 141, 3.)

Van, P. S. M., Corkeron, P. J., Harvey, J., Hayes, S. A., Mellinger, D. K., Rouget, P. A., Thompson, P. M., … Kovacs, K. M. (January 01, 2003). Patterns in the vocalizations of male harbor seals. The Journal of the Acoustical Society of America, 113, 6, 3403-10.

Get Back I Tell You!

Here’s a post about anemone enemies (say that 5 times).

See those really long tentacles extending from the Short Plumose Anemones in the following image? These are “catch tentacles” that can extend to be up to four times longer than the feeding tentacles.

Short Plumose Anemones reach around with these specialized, extendable tentacles and THEY ATTACK if they come in contact with a different species of anemone, or others of the same species who do not have the same DNA (are not their clones).

The tip of the specialized tentacle breaks off and kills the cells in the spot where they touch their anemone enemy. Apparently this can even kill the target anemone. Short Plumose Anemones on the outside of a group of related clones are more likely to use / develop these specialized tentacles.

Short Plumose Anemones AND Giant Plumose Anemones also have nematocysts (stinging cells in their feeding tentacles) AND they have acontia. See following image. These are defensive strands filled with stinging cells that are EJECTED from their mouths or through the anemones’ bodies when threatened or stressed. These threads extend far beyond the anemone and provide longer distance defence than the stinging cells.

None of the stinging cells of local anemone species impact we humans. But how I wish I had some acontia! Yes, I have defence envy. 🙂

From Invertebrates of the Salish Sea: ” Animals on the border of a clone often develop up to 19 “catch tentacles”, which generally occur close to the mouth.  These tentacles, which are larger and more opaque than the other tentacles, have special nematocysts and are unusually extensible (they can become up to 12 cm long or more).  They probe the area around the anemone.  While they do not respond to food, they DO fire when they contact either A. elegantissima [Aggregating Anemone] or another clone of M. senile.  When it fires, the tip of the tentacle breaks off and sticks to the victim, which may retract and bend away.  Tissue damage can generally later be seen in the stung area, and the attacked individual may even die.”

Image is of Giant Plumose Anemones = Metridium farcimen to 1 metre tall. Short Plumose Anemones are Metridium senile to only 30 cm tall and their crown is not as lobed. This photo is the image for this month’s WILD Calendar.

Photos taken in Kwakwaka’wakw Territory near Telegraph Cove, ©Jackie Hildering

Great White! Not what you think . . .

Great White!
Not quite what you were expecting?  

These are Great White Dorids. Yes, they are a species of nudibranch and the individuals featured here are mating, prowling for sponges AND succeeding in laying their astounding egg masses.

Mating Great White Dorids: Reproduction of nudibranch species is always right-side-to-right-side; attached by structures called “gonophores”. As reciprocal hermaphrodites, both parents become inseminated and lay eggs.

EACH dot you see in the egg masses (photos below) contains 8 to 12 fertilized eggs. They are laid by both parents because it makes a lot of sense to be a hermaphrodite when you are a sea slug and your eggs hatch into the sea. More fertilized eggs = more chances of some young surviving.

Even after so many years, I find the intricacy and diversity of sea slug egg masses something of jaw-dropping wonder. Not such a good thing when you are supposed to hold a regulator in your mouth while diving. 🙂

Scientific name of this species is Doris odhneri. They can be up to 20 cm long and their egg masses can be at least that size too.

Body design is classic for the sub-classification of nudibranchs that is “the dorids”. Those tufts on their hind ends are the gills and the projections on their heads (which all nudibranchs have) are the sensory rhinophores (rhino = nose). It’s how they smell their way around to find mates, food and whatever else is important in their world.

Notice in the next photo how dorid species are able to retract their gills when disturbed by the likes of an annoying underwater photographer.

Gills retracted.

Amazing too to think of the importance of smell in the sea isn’t it? Why is the individual in the following photo reared up like that? I believe it allows a better position to smell / detect the chemicals of food and/or a mate. Maybe they are even releasing pheromones? Note that is me musing. There is no research I know of to support this.

Same individual as in the first photo in this blog. I asked super sea slug expert, Dave Behrens, about this behaviour years ago and his response was: “I will agree the “rearing” is unusual in this group of dorids. Rearing is common amoung phanerobranch dorids (those that cannot withdraw their gill) . . . Although we will never know for sure, the behavior is thought to be a way for the slug to elevate itself above the substrate in search of chemical clues for its favorite prey.”

In featuring this species, the Great White Dorid, you see that not all nudibranch species are super colourful. But they are all super GREAT.


Species is also referenced as the GIANT White Dorid or Snow White Dorid, or White Dorid or White-Knight Nudibranch . . . etc. Known range is from southern Alaska to California but it’s a species I don’t see often where I dive around northeastern Vancouver Island. 

Another perspective on a Great White Dorids astonishing egg mass.
Prowling for sponges, a mate, or both. 🙂
Poor photo (because my camera housing had moisture in it that condensed in front of the lens) BUT this image shows a Great White Dorid laying an egg masss. It’s one of the times I caught a Great White Dorid in the act whereby I could know what the egg masses look like for this species (albeit that there are some closely related species of nudibranch that lay very similar looking egg masses).

All photos taken in Kwakwaka’wakw Territory, NE Vancouver Island ©Jackie Hildering.


Mask Squeezed and Lessons Learned

This is a personal post.

The photo above is of me 21 years ago, about a week after I got “mask squeeze” on my 37th birthday. I came across the image while preparing for an Ocean Day talk last week. It was taken as a staff photo when I had the joy of teaching children with special needs.

I found myself staring at the photo, at younger me, and thinking of how much has been learned since then. I am sharing with you because . . . because why? Sure, there’s a lesson in physics here but that’s not it. There’s also maybe something of value in how the most important things in life sometimes don’t come easy. But more than that, it’s about sharing some of what I have learned in these years, what I strive to put into the world, and why. 💙

It won’t surprise you to know that you can’t be the same after you’ve been punched in the face by the Ocean. So here goes . . .

Mask squeeze happened on my 20th dive when I did not know enough to realize how little I knew. It was my second birthday back in BC after my many years of teaching in the Netherlands.

I was on a dive trip to some of the most challenging conditions on our coast. The accident happened during one of my first dives in a dry suit. I now know it was madness to be doing my first dives in a dry suit in such challenging conditions. But it was the result of some human chaos and unreliability whereby the suit was not ready when it was supposed to be. Thereby, I could not sufficiently practice with the dry suit before the dive trip and get used to the change in buoyancy from my Dad’s old, thin wet suit.

On that 20th dive, when I rolled into the water off the boat, my fin slipped off my suit. My mask flooded. I did not realize I was holding my breath as I tried to grab the fin. I continued to descend whereby the pressure in my mask did not equalize. BOOM – the pressure of Mother Ocean pushed against my mask and blew out every capillary in my eyes.

From my dive log back then: “ Whatever it took, it was SO worth it. Astounding, astounding life. So grateful to my dive buddies who helped me and who decided the dive site should now be named Shiner Rock.”

It was a powerful lesson in shaping me on this path . . . the vital importance of humility, respect and knowing one’s place in the natural world.

Since then, I have metaphorically faced equivalent injuries, usually inflicted as a result of human ego and disconnect from understanding how our actions impact future generations.

The resulting process has been the same: learn, heal, surface, and repeat.

I will admit too that this photo makes me reflect on the few who say to me “You’re so lucky” or who have had the need to try to blow out my fire. I am lucky in many, many ways but, as much as I do not know the journeys of others, very few know my path – some very difficult choices made and painful lessons learned. We’ve all had those and how very easy and privileged indeed my path has been compared to that of so many others.

I’ve written about having mask squeeze once before, after my 800th dive over 7 years ago. There I reflected: “The Ocean is the source. The battle force. She is my inspiration. She is the beginning and she is the end. She is where I hide and where I am fully exposed. She has taught me my most valuable lessons and . . . . I know it’s not over yet. Not by a long shot.”

I thank all who carry me forward – from my dive buddies to you, the readers, who signa shared values and understanding. . Please know how much direction you give.

Onward, fuelled by lessons learned and knowing what matters most.


See this link for my previous blog about mask squeeze and lessons learned:
“My 800th Dive. From Shiner to Shining?” from January 2014.

Marine Murmuration – Pacific Herring

Rapturous. That’s a word I do not use easily, but it captures my feelings about today.

I saw the shimmering in the distance . . . Pacific Herring near the surface, scales reflecting the sunlight, the school mercurial, its members seemingly moving with a collective consciousness.

I hung back and tried to drink in the beauty. I knew my bubbles would disturb them and that I could therefore never capture the beauty in a photo.

But then . . . suddenly a river of flashing silver was streaming in my direction. Something had startled them on the opposite side of where I was. I held up the camera and repeatedly depressed the shutter release button while I lived the seconds of hundreds of herring bolting past. Then, they were in the distance again; a marine murmuration; the life’s blood of this ecosystem.

Cropped image.
 The school in the distance again, such beauty with flowing Bull Kelp and the sun streaming down.

Survival against so many odds. These little fish have survived against so many odds and so vital to so much life on our coast; not just in the Ocean but also to predators from sky and land.

Shorebirds, bears and wolves feed on the fertilized eggs. Hungry Humpbacks target giant mouthfuls to gain back weight lost in the breeding grounds. Bald Eagles deftly snatch talons’ full and then feed in the air. The Pacific Herring also feed the Chinook Salmon that sustain endangered Orca.

They have also fed human cultures and commercial fisheries and debate and demonstration.

May the feed precaution and reflection on what will sustain future generations.

Long live herring.

This image is from a previous chance to see Pacific Herring in the distance while diving – January 31, 2021, Telegraph Cove.

On the Radio . . .

I am so grateful for having been interviewed by Sheryl Mackay for CBC Radio’s North by Northwest and for how she captured the messaging for conservation.

This has led to a significant spike to my website and to social media channels which means . . . more reach of this work.

Welcome to all who have found their way here through their interest in, and love and concern for, the life-sustaining Ocean. 💙

 

Please click to hear the episode.


Social media links. 

World Whale Day 2021

Today is World Whale Day.

The following is what I wrote for our Marine Education and Research Society social media.

I am sharing it here too in the hopes that it is of value to you in thinking about our giant neighbours, how far we come in overcoming fear and disconnect but  . . . read on. 💙

[And welcome to all those landing here as a result of the recent CBC interview. It would be wonderful if you follow along on social media with The Marine Detective and the Marine Education and Research Society. Links are at the bottom of this post.] 

 

Take but a few minutes to reflect on the giants; how they enrich life on earth and how endure human need?

They inspire awe, capture carbon, fertilize the ocean upon which our lives also depend, and remind us of our capacity for change.

So many were driven to the brink as a result of whaling, which only ended in British Columbia in 1967. They have survived the breadth of human impacts from harpoons and guns, to overfishing and ignorance of ecosystems, to capture and the selfie absorption of believing wild whales put on shows.

Some populations may topple still.

Now they swallow the consequences of our disconnect and consumer crazed lifestyles – climate change, plastics, toxins, continued overfishing, noise, collision, entanglement, etc.

The leviathans, may we truly understand how they are barometers of our value systems, indicators of environment health, ambassadors of the marine ecosystem that sustains life on earth, and reminders of how little we know and that we are but small . . . in the world of the whale. 💙


Photo is of Cirque the Humpback with scarring testifying to being a survivor of collision. See the scarring from a boat propeller?

©Kate Holmes, Straitwatch 2019. Photo taken with a telephoto lens and has been cropped.


World Whale Day dates back to 1980 and originated from Maui’s Whale Fest to honour Humpback Whales.

Social media links. 
Thank you so much for your interest!

Beware of taxi-crabs and “Cling like hell to your rock”

Oh how did I get to be today-years-old without knowing of this Robert Service poem that is so timely and speaks for a limpet?

His poem “Security” includes:

So if of the limpet breed ye be,
Beware life’s brutal shock;
Don’t take the chance of the changing sea,
But – cling like hell to your rock.

Yes!

Full poem is below which includes life lessons about taxi-crabs 🦀

Keyhole Limpet which I photographed near Port Hardy. Diodora aspera builds a shell up to 7.6 cm across.


 

Security
Robert Service

There once was a limpet puffed with pride
Who said to the ribald sea:
“It isn’t I who cling to the rock,
It’s the rock that clings to me;
It’s the silly old rock who hugs me tight,
Because he loves me so;
And though I struggle with all my might,
He will not let me go.”

Then said the sea, who hates the rock
That defies him night and day:
“You want to be free – well, leave it to me,
I’ll help you get away.
I know such a beautiful silver beach,
Where blissfully you may bide;
Shove off to-night when the moon is bright,
And I’ll swig you thee on my tide.”

“I’d like to go,” said the limpet low,
“But what’s a silver beach?”
“It’s sand,” said the sea, “bright baby rock,
And you shall be lord of each.”
“Righto!” said the limpet; “Life allures,
And a rover I would be.”
So greatly bold she slacked her hold
And launched on the laughing sea.

But when she got to the gelid deep
Where the waters swish and swing,
She began to know with a sense of woe
That a limpet’s lot is to cling.
but she couldn’t cling to a jelly fish,
Or clutch at a wastrel weed,
So she raised a cry as the waves went by,
but the waves refused to heed.

Then when she came to the glaucous deep
Where the congers coil and leer,
The flesh in her shell began to creep,
And she shrank in utter fear.
It was good to reach that silver beach,
That gleamed in the morning light,
Where a shining band of the silver sand
Looked up with with a welcome bright.

Looked up with a smile that was full of guile,
Called up through the crystal blue:
“Each one of us is a baby rock,
And we want to cling to you.”
Then the heart of the limpet leaped with joy,
For she hated the waters wide;
So down she sank to the sandy bank
That clung to her under-side.

That clung so close she couldn’t breath,
So fierce she fought to be free;
But the silver sand couldn’t understand,
While above her laughed the sea.
Then to each wave that wimpled past
She cried in her woe and pain:
“Oh take me back, let me rivet fast
To my steadfast rock again.”

She cried till she roused a taxi-crab
Who gladly gave her a ride;
But I grieve to say in his crabby way
He insisted she sit inside. . . .
So if of the limpet breed ye be,
Beware life’s brutal shock;
Don’t take the chance of the changing sea,
But – cling like hell to your rock.

 


I ensured this is indeed Robert Service in all his glory by ensuring it was in the “The Complete Works of Robert Service” (1945) but could not find further detail on when he wrote it.


My additional posts featuring limpets:

 

It’s Their Ocean

It’s their Ocean.

Photo below was taken during a chance encounter with mature male Steller Sea Lion as he glided by Bull Kelp.

I can’t share this photo without providing the following information because sea lions and seals are caught at the interface of human love / hate in British Columbia. It’s volatile.

Photo: October 4th near Telegraph Cove.

Please know we don’t target seal or sea lion haul outs. We do not want to force an interaction and contribute to habituation.

But, sometimes, they find us. And that is a great gift.

It is in fact against federal law to conduct “swim with” operations where divers and/or swimmers are put in the water with the purpose of having interactions at haul outs. This has been the case since July 2018 when the amended Marine Mammal Regulations went into effect. They explicitly state: “No person shall approach a marine mammal to, or to attempt to .  . . swim with it or interact with it.” 

Habituated wild animals lose their wariness which will not work well for them, or us. Wild animals do not allow you to touch them nor to put your hand in their mouths. Human injury has resulted as a resulted of seals and sea lions becoming habituated to humans / divers. Of course it has.

Habituation is especially a concern in this time where seals and sea lions are being vilified for interactions with fisheries. Horrific hate language and imagery are being perpetuated on social media. It’s one thing to have an opinion. It’s another to perpetuate hate. 

In my work as a marine educator, I’ve asked for clarity regarding the Marine Mammal Regulations and their enforcement. It’s part of my job with the Marine Education and Research Society to educate about laws involving marine mammals. There is also a personal layer of concern because dear friends are involved with swim-with operations whereby there are implications for their businesses and welfare.

My understanding is that the lag in enforcement regarding “do not swim with” has been due to having to prioritize resources (e.g. enforcement of infractions around endangered whales) and wanting to provide an opportunity for education before enforcement.

This is also the case regarding it being against the law to feed seals and sea lions. This used to be a common practice at some fish processing plants and tourism facilities. Education was provided first. Enforcement of the law will now follow.

I am sharing this information in an effort to educate on the law and what best serves wild animals.

Pacific Harbour Sea emerging from the kelp forest. It’s something I will never forget. We were ending our dive and entering in the shallows for our safety stop. I noticed something moving in the Bull Kelp. Then I realized it was seal playing there, corkscrewing her/himself around the stipe of kelp and then spinning out of it and . . . repeat. I put down my camera. I tried to drink it in, to learn, and to realize I had formed a bias to perceive seals as I saw them on the surface. I had unconsciously undervalued their intelligence and playfulness. I did lift my camera as the seal moved out of the forest. Yep, a gift.


*Canada’s amended Marine Mammal Regulations include:
No person shall approach a marine mammal to, or to attempt to:
(a) feed it;
(b) swim with it or interact with it;
(c) move it or entice or cause it to move from the immediate vicinity in which it is found;
(d) separate it from members of its group or go between it and a calf;
(e) trap it or its group between a vessel and the shore or between a vessel and one or more other vessels; or
(f) tag or mark it.


Regarding the vilification of seals and sea lions, please see our Marine Education and Research Society backgrounder “To Kill Seals and Sea Lions?” at this link.

A Smack of Jellies

The last little while there have been hundreds, and hundreds, and hundreds of Moon Jellies = a “smack” of them. That truly is the collective noun for jellyfish.

It should also be the collective noun for the number of jellyfish photos I am delivering in this blog.

 

May these photos from my last dives north of Port Hardy offer you a bit of escape. I tried to capture trees in photos of jellies and the reflection of the jellies against the surface of the water. I hope the images communicate interconnectedness of land, sea and sky. May  they also contribute to understanding and connection to our neighbours in the sea.

Moon Jellies are easy to discern from other jelly species by having the clover shape which is 4 gonads / sex organs (Aurelia labiata to 40 cm across). 


Most jellies in the class to which Moon Jellies belong (the Scyphozoan) release eggs and sperm into the water column. But in Moon Jellies, when the male releases sperm, the pulsing action of the female Moon Jelly brings the sperm in contact with the eggs under her arms and the are brooded there. The following three photos show females with eggs. The eggs are the less translucent white structures. 

 

 


And as if this was not all amazing enough there was also a ” blizzard* of babies . . . just LOOK at how many juvenile Widow Rockfish there are!

It was so extraordinary to see them nipping at the bells of the Moon Jellies, darting about everywhere. There was another phenomenal explosion of young like this in 2016 and, with site fidelity being so strong, those fish may well be the bigger ones we saw at these sites too.

 

 

The following facts about Widow Rockfish are from Dr. Milton Love’s brilliant “The Rockfish of the NE Pacific”: The mothers produce one brood of about 95,000 to 1,113,000 eggs/year which hatch as larva from their mothers (rockfish are viviparous). They stay in the plankton for about 5 months feeding on copepods and krill and can grow up to 0.61 mm/day. Then they settle out to be in nearshore areas like you see here and feed on salps and jellies, small fishes, crabs, amphipods and krill.

Why are they named “Widow” Rockfish ? “. From Dr. Love’s book too: Julius Phillips, a great observer of the rockfish fisheries of California during the mid-twentieth century, believed the term widow can about because the “black peritoneum an small effeminate mouth give the impression of lonesomeness to occasional specimens that appear amount the more common bocaccios, chilipepper and yellowtail rock cods” (Phillips, 1939).

Maximum  life expectancy for Widow Rockfish (Sebastes entomelas) is 69 years. Maximum length 60 cm. Females typically bigger than males.

The bounty of babies has been reported by myself and others to those monitoring rockfish health. To my knowledge, nobody knows why there have been these two explosions of young of this species (2016 and 2020).

 


And to conclude, I had hoped that I might also photograph a Lions Mane Jelly with land in the background. On the last dive of nine, the light and life lined up to allow me to take this photograph.

 

The Lion’s Many Jelly is one of two of the biggest jelly species commonly found off our coast = Cyanea capillata (the other is the Egg Yolk Jelly). Maximum size of Lion’s Mane Jellies is to 2.5 m across with 8 clusters of 70 to 150 tentacles which can be . . . 36 m long! This is the largest jelly species in the world. Know that the larger ones tend to be further offshore and that they can retract their tentacles. These two species are also the only two common jelly species in our waters that can create a sting that irritates human skin, even when the jellies are dead or you get a severed tentacle drifting by your face.

A Lion’s Mane Jelly is the murderer in a Sherlock Holmes short story entitled “Adventure of the Lion’s Mane” (I kid you not), BUT the “victim” had a preexisting heart condition. The solution to the irritation is vinegar (acid), meat tenderizer (enzyme) and I know that many fishers swear by Pacific canned milk. Research at this link puts forward that vinegar is the only real solution. Clearly I’ve never been stung badly enough to deter trying to photograph them.


Photo below is of planktonic me after a full dive trying to capture jellies and trees in the same image. Photo by dive buddy Janice Crook.