Giant catfish fins are edged with a natural poison that causes a painful burning sensation for 3d10 rounds if a save vs. Poison is failed. The pain causes the affected character or creature to suffer a -1 penalty on all attack rolls and saving throws; further poisonings will increase this penalty by -1 each, down to a maximum penalty of -5 as well as adding 6 rounds to the duration of the poison effect.

Because of its large size (15 to 20 feet long) and body design, a giant catfish cannot target more than one of its attacks on any single creature; that is, it cannot bite and fin the same opponent, nor use both fins on one victim.