Wolffish

The Atlantic wolffish (Anarhichas lupus), also known as the seawolf, Atlantic catfish, ocean catfish, devil fish, wolf eel (the common name for its Pacific relative), or sea cat, is a marine fish, the largest of the wolffish family Anarhichadidae.

Empath: The Luckiest Smurf stories
The wolffish appears in the EMPATH: The Luckiest Smurf as one of many dangerous creatures that the merfolk and the Snorkelians deal with on a regular basis.

Hero: The Guardian Smurf stories
In the HERO: The Guardian Smurf story series, a wolf-fish was created when Scruple transformed a fish through the use of the Wolfbane Spell, which would then transmit it to Hero and thus turn him into a weresmurf.