This is an unnamed species of copepod. A copepod is a crustacean.

Salmon are carnivorous, however, and to feed the voracious appetite of these legions of farm raised fish, the aquaculture industry increasingly has turned its attention to a small crustacean commonly known as Antarctic krill. But that s bad news for leopard seals and Adelie penguins, humpback and blue whales, and many other species, because most organisms in the Antarctic marine ecosystem eat either krill or something that eats krill.