It is difficult to distinguish black-tailed fish, which can be distinguished from the following characteristics: the male fish is small, beautiful and crooked, and the female fish is big; The male fish flag is long and sharp, and the female fish flag is small and round; Male fish heads have long tails and short bellies, while female fish heads have short tails and high bellies. The rear abdomen of the female fish will become larger because of carrying eggs.

The side of the black tail fish is flat and high, like an oval. The head is short, the kiss is round and blunt, and the eyes are slightly larger. The base of dorsal fin is very short and the fin is very long. The ventral fin is slightly larger and the end is close to the starting point of the anal fin. The bottom of the gluteal fin is very long. The caudal fin is bifurcated. There is a small fat fin above the tail stalk.

The fish is silvery white, with three black vertical stripes on its side, one passing through the eyes, the middle one at the back of gill cover, and the third one between the starting point of dorsal fin and the base of pectoral fin. The back half of the fish is black, and the caudal fin is silvery white. Three old fish with black stripes turned dark gray.

(The female fish in the picture above and the male fish in the picture below)

Extended data:

Feed point:

Gentle temperament, like to live in groups, can live with other small light fish. The inlet water temperature is 22~28℃, and it likes weak acidic soft water and is resistant to low temperature. Aquarium should have a variety of aquatic plants, and the water color should be clear and transparent. Because the fish is small and the food intake is small, the bait particles are required to be small and live food is the main food. Very suitable for tropical fish lovers who have no breeding experience.

When feeding for the first time, you should feed "backwater" and gradually feed other fish and insects. Snakehead is easy to raise, and the requirements for raising conditions are not high. The inlet water temperature is 20~30℃, and the water quality is slightly acidic and soft. All kinds of bait can be fed, with large appetite and fast growth. Black snakehead is strong, lively and docile, but timid, and likes to swim in the upper and middle waters of the aquarium for food. Seldom eat bait that floats on the water or sinks at the bottom of the tank.