Skum

In the Dungeons and Dragons fantasy role-playing game, the Skum is a fish-like Aberration. It resembles an ugly, black/dark green fish-humanoid, with muscular limbs, hands and feet which are both webbed and clawed, very veiny and tight-packed flesh, a tail, and fins protruding from the head, tail are armpits.

The Skum lives in watery grottos and caves in broods of 2 to 5 individuals or packs of 6 to 15. As its name suggests, it is a rather scummy creature, and could be described almost as an underwater equivalent of an Ogre or Minotaur. They speak Aquan, and are lawful evil in alignment.