Blackfish is a bit cleaner compared to catfish, which is an aggressive fish that lives in the middle and upper layers of the water column and only feeds on live bait, such as small fish, shrimp and frogs. Since the blackfish has a relatively single food source, it will not have many parasites and bacteria in its body. Catfish is a kind of fish living in the bottom of the water body, often live on carrion, blackfish relative to catfish clean some.