2. Blackfish among these fish are food fish, scientifically named snakehead, which is an economic fish.
3. The ink dragon eye is a kind of goldfish, not only the body is black, the eyes are also very large, very beautiful.
4. Black Mary is a small tropical fish, with a certain degree of aggressiveness, while the black koi is a large fish, the requirements of dissolved oxygen in the water is relatively high.