I have written about global warming’s impact on the ocean off the coast of Oregon as well as on local steelhead and salmon populations. To put it mildly, warming, acidification, and oxygen deficiency have not been beneficial. At the same time, some far northern locations, close to the arctic, have seen record runs of some species. Bristol Bay is a good example. Here’s a report in the journal Science which helps quantify all this. The bottom line is that ocean fish populations are clearly declining overall due to global warming.