Judging from your picture, this kind of fish is called fighting fish. It's our local fighting fish.

Betta is widely distributed in China, with obvious characteristics and easy identification.

The morphological characteristics of round-tailed betta are:?

The side of the body is flat and rectangular, with the back and abdomen protruding and slightly curved. The head is flat. Kissing short process. The eyes are big and round, and the side is superior. The anterior part of the lower margin of the anterior orbital bone is free with weak serrations, and the posterior part is covered under the skin.

Eyes are widely spaced and slightly prominent. The front nostril is close to the edge of the upper lip, and the back nostril is close to the front edge of the eye. Small mouth, upper position, oblique fissure, mandibular microprotrusion.

Round-tailed betta as shown in the figure: