I'm worried about what's going to happen due to overfishing.  Trawlers go out using huge nets and scoop up much more than they'd get if they were merely fishing in the more traditional sense, and we're also limiting the food supply for other species at the same time.  

Cod is a fish with a white flakey flesh with a mild taste and is a popular food in several countries.  Older people may remember it as a source of cod liver oil.