I found back the same Tiger Rockfish in the same spot after eight years.
Yes, on top of cataloguing Humpback Whales, I catalogue Tiger Rockfish. I can’t stop myself.
There’s so much that may be learned when you can recognize animals as individuals. There is more conservation value too when people realize that even individual fish have homes.
The markings in this species of rockfish are so distinct that it is easy to recognize them as individuals IF they are not tucked away deep in a crack which is often their way. See below to compare the markings of this mature female to two other individuals for whom I also have repeat sightings at this location. I will clearly have to hand off this cataloguing to a younger biologist since these fish are likely to outlive me. They are known to be able to live to age 116.
I was already very excited when I found back this individual after 6 years. Now I can show that this fish was documented in the exact same location after least 8 years. This shows how strong the site fidelity is and why Rockfish Conservation Areas can have such success. Please read more on Rockfish Conservation Areas, barotrauma and rockfish reproduction in my previous blog at this link.
Tiger Rockfish = Sebastes nigrocinctus to 61 cm (35 cm by 17 years of age).
Below, pages from my Tiger Rockfish ID catalogue for this site.
The fish above is “Tiger Rockfish 1”. Note how distinct the markings are and how easy it is to recognize these individuals. I nickname these fish for distinctive features as we do with the Humpback Whales. Tiger Rockfish #1 is now “Papillon” for the bowtie like marking on the right side of her head.
Below is another Tiger Rockfish in my catalogue so you can see how distinctive their markings are, allowing them to be recognized as individuals.
Update 2022-09-14 Have now documented Rockfish #4 (Darwin) for 3 years in the same location. See my posts from April and September 2022 below.
Resources:
Get the app that alerts you when you enter a Rockfish Conservation Area
Get the app that alerts you when you enter a Rockfish Conservation Area.
Update: Fisheries Notice March 25, 2019 The use of a descending device is now required by condition of licence to assist in the conservation and survivability of rockfish being returned to the water. Because of their closed swim bladders, rockfish brought to the surface suffer barotrauma, causing the swim bladder to inflate and reducing the probability of their survival upon release. Handle catch as little as possible, using wet hands to preserve the protective slime coat, and return to the water at depth of capture as quickly as possible (under two minutes). To avoid catching rockfish, move to another fishing location.”
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This photo is of a Yelloweye Rockfish that has died from barotrauma, also known as “pressure shock”.
Yelloweye Rockfish that has died of barotrauma. Reduced water pressure causes the air in the swim bladder to expand and push out the esophagus and eyes. BUT this is a reversible condition whereby the fish can survive through use of a “fish descender”. Photo: Hildering.
Many rockfish species are particularly sensitive to reductions in pressure since the air in their swim bladders expands substantially. The swim bladder is a buoyancy control organ and even when slowly reeled in from a depth of only 20 m (60’), a rockfish’s swim bladder can expand to three times its size, putting pressure on the fish’s organs.
As is the case with the Yelloweye Rockfish in the photo, the swim bladder can expand to the point of causing the fish’s eyes to bulge out of their sockets and its esophagus to be pushed out of its mouth (the esophagus is the first section of the digestive tract). I know this is likely a sight that may not enhance your appetite for your rockfish catch but please read on since, contrary to the thinking of many, this IS reversible whereby the rockfish stands a good chance of survival.
Colossal “management” errors were made with overfishing slow-growing rockfish. Many species are extremely long-lived, slow to sexually mature, and the big, old females are the most fertile – producing the most eggs and hatching the largest number of healthy young.
For example, Yelloweye Rockfish are believed to have a lifespan of up to 118 years. They don’t reproduce until they are at least 12 years old, and the old females can incubate up to 2.7 million eggs! Know that there are 38 species of rockfish off the coast of British Columbia.
This means that species are very slow to reproduce whereby, if you catch lots, especially the big females, you can devastate populations very quickly.
Another nail in the coffin of rockfish is that many adults also have high site fidelity so that by fishing one area, you can wipe out a community of fish. Click here for my blog on having found back the SAME individual rockfish in the SAME spot after EIGHT YEARS. This is why Rockfish Conservation Areas (RCAs) are essential, where it is most often illegal to do any hook and line fishing (see restrictions here).
But, what is you accidentally catch a rockfish outside these areas?
There are studies that support that if you were to quickly recompress the fish, it would stand a very good chance of survival, even where it appears dead at the surface. The fish could be brought back to depth with barbless weighted hooks, or commercial “fish descenders”.
This video make the life-saving potential of fish descenders very clear.
From Island Fisherman Magazine: “Common types of descending devices include a simple, inverted barbless hook, a spring-loaded clamp, and a pressure-release clamp. Of the different devices available, the most effective and simplest to use is a depth pressure activated release device, the Seaqualizer . . . Automatically opening at preset depth, the motion of the boat or the actions of the rockfish as it descends will not prematurely release the fish.“
How wonderful it would be if more people would undertake the effort to recompress the fish, knowing how dire the situation is for many rockfish species. Imagine the further positive impact if people would choose to return the depleted species to depth even when they haven’t reached their catch limit, especially the big, highly productive females.
But, even if there was to be such enlightenment, many rockfish populations are so depleted that they need far more protection.
Again, Rockfish Conservation Areas (RCAs) are essential. These should be areas known to be the territory of depleted rockfish populations. Since these are no-fishing zones, there is no chance of barotrauma and the rockfish populations that live in the area are given the time to rebuild to have more sexually mature fish and more big old super mamas.
The Marine Detective 