It's hard to take something like this seriously when it spends 3 (large) paragraphs scare mongering about the fact that fish "may" contain plastics, only to end with:

>> Even though current research shows we do not absorb most plastics, it’s possible that a small amount (about 1 percent) can still accumulate in our bodies over time. That number might change: research on microplastics in our food is still in its infancy, and while some studies have documented the detrimental effects of plastics on fish and other aquatic animals, we still don’t know much about their long-term effects on humans.

So, all current scientific evidence points to this not being a problem. But it _might_ _maybe_ _someday_!

edit - I've also never heard of any food safety guidelines that specify different storage temperatures for different species of fish. The whole thing is pretty suspect.