Mostly other fish or dragonfly larva.
A shanny or blenny is sold commercially as Ocean Catfish It is a common food fish
People eat catfish.
Catfish are fresh water fish and they hide in the mud. There are several saltwater catfish species, and these are sometimes prey for ospreys, pelicans, gannets, and boobies. Many catfish species, like blue catfish and channel catfish, and flatheads, are predatory, feeding mainly on fishes.
People eat catfish.
Humans eat Redtail Catfish.
catfish eats nearly everything it fit in his mouth
Sharks.
beetroots
a human :0)
It eats fish
Catfish do not swim in the ocean, they are found in rivers, creeks, and fresh water ponds.
Will do no harm, I have a cat that eats Dogfish heads.