This week's topic is similar to last week, but is for creatures which are fish, semiaquatics, cetaceans, amphibians, molluscs, cephalopods, or are otherwise water-based. This basically includes any fish, sharks, whales, crocodiles, octopuses, squids, and any creature whose habitat is water.
They don't have to exclusively live in water, but for the purposes of your list, they have to be water, not land-based in the films you are including.
KILLER FISH FILMS 