The largest marine predator on the planet right now is the cow. More than half the fish taken from the sea is rendered into fish meal and fed to domestic livestock. Puffins are starving in the North sea to feed sand eels to chickens in Denmark.
Sheep and pigs have replaced the shark and the sea lion as the dominant predators in the ocean and domestic house cats are eating more fish than all the world's seals combined. We are extracting some fifty to sixty fish from the sea to raise one farm reared salmon.
This is ecological insanity.