 The name "piscivore" is derived from the Latin word for fish, "piscis".Some creatures, including cnidarians, octopuses, squid, spiders, sharks, cetaceans, grizzly bears, jaguars, wolves, snakes, turtles, and sea gulls, may have fish as significant if not dominant portions of their diets.The ecological effects of piscivores can extend to other food chains.