Slaughterfish appear in The Elder Scrolls V: Skyrim.
Unlike previous Elder Scrolls games where they appeared, Slaughterfish now lay Slaughterfish Eggs, which can be harvested from egg nests in the water. Slaughterfish can be killed for minor treasures and their scales, which are alchemy ingredients.
Slaughterfish can now leap on to waterbanks and still effectively attack the player, unlike in Oblivion where they flop around and become an easy target.
Since the player cannot unsheathe their weapons, or cast magic, underwater, it is not recommended to try to fight a Slaughterfish in its natural habitat.