Well, I suppose we should have known the massive, constantly growing collection of plastic (was the size of Texas last time I read something about it) concentrated in the Pacific gyre might pose problems eventually. It's thought to be a problem for birds, too.

Plastic's incredibly useful stuff, but it doesn't make good food. Unless we find a way to clean it up (and stop adding to it), that stuff will be there for thousands of years and beyond.

Makes sense this could be a big part of the reason the high seas roaming steelhead aren't surviving well.