I've held my tongue on this post in the past, because my views that are outside of the mainstream, aren't really appreciated here, but here goes.
I don't know for sure what's happening, but I suspect that Fukishima radiation has something to do with it. In 2011, three reactors went meltdown. They pretty much dumped all the radiated water in the Pacific Ocean, that keeps cooling the out of control reactors. There are reports of dead zones in the Pacific Ocean now.
They are still trying to figure out what to do with Fukishima, from what I read last. Every time they send a robot down there, it gets fried by radiation.
Salmon are on the decline, Alaskian King Crabs are on the decline, California tide pools are reported to be dead, by this guy Kevin Blanch. I'm more of the conspiracy theorist, than believe the official story, so be prepared to disagree I suppose.
Maybe the Sea Lions are starving and blame humans, or maybe they are just hungry due to the decline of life in the ocean, and humans look like good food at this point?!?! Reports of Grizzly Bears are starving, due to lack of salmon. This post isn't pointing fingers at Japan, GE, or other entities. It could be just something, that further proves "The Book".
There are other warning signs, I have been noticing, such as California surfers getting cancer. It appears to be ticking up, but it's not something I monitor really, but I have been seeing some news stories here and there.
This guy Kevin, sort of predicted, that after 4 years after the Fukishima meltdown, the salmon population would be extreme decline. According to his research, he is right. The official story is probably global warming, or something, I don't know.
If interested, research it. Here is Kevin's channel, if someone wants to hear an alternative view.
If someone wants to look at the all decline in sea life in the Pacific Ocean, maybe there is another reason, besides climate change....
"In 2018-2019, the snow crab population in the Bering Sea experienced a decline of over 90%, with billions of crabs disappearing"
"Many Pacific salmon populations are facing significant declines and are considered to be on the brink of extinction due to factors like habitat loss, climate change, dams, and overfishing, with some species already listed as threatened or endangered"