Slaughterfish appear in The Elder Scrolls V: Skyrim.
Unlike previous Elder Scrolls games where they appeared, Slaughterfish are much less common and 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. They are found in rivers, oceans and occasionally ponds.
Slaughterfish now have the ability to leap on to waterbanks and still effectively attack the player, unlike in Oblivion where they flop around and become an easy target. When dead, their corpses float.
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. However, a Slaughterfish can easily be killed while underwater by a player wearing the Ebony Mail, due to the Mail's damage effect.