The dogfish belongs to the Salmoniformes, Dogfish family, Dogfish genus. That is, the black spotted dogfish. Common name: dogfish, duckfish. English name: Pikes , Amur pikc . The dogfish is a widely distributed freshwater fish in the northern hemisphere from the frigid zone to the temperate zone. The mouth is large and flat like a duck's, and the lower jaw is prominent. It is the most aggressive carnivorous freshwater fish, attacking other fish as well as frogs, mice and ducks. It is said that it can eat as much food as its own weight in a day.