Will. Dogfish belong to the Salmoniformes, Dogfish family, Dogfish genus. The black spotted dogfish. It is a widely distributed freshwater fish in the northern hemisphere from the cold zone to the temperate zone. Blackfish is the common name of snakeheads, also known as blackfish, raw fish, wealth fish, snakefish, firehead fish, etc.. Its ferocious nature, strong reproduction, the two of them together will be robbing food and space, so it will fight, is not suitable for breeding together, can only be placed in two venues for breeding.