It is difficult to distinguish without a picture. According to the pictures searched online, it should be?

As shown in the picture, farmed fish (not marine fish) should be

Cyprinidae Tinca fish

The picture below shows Tinca tinca, also known as European tench, tench, and barbel fish

< p>The body length can reach 70 cm. Most of them are small in size and have small, orange-red eyes. Sexual dimorphism is not apparent, except that females have a more protruding abdomen than males. The outer radial ribs of the male's pelvic fin also appear to be thicker and flatter. The body is slightly tall, rounded and flattened on the sides. The body is generally olive green, the back and sides of the body are blue and black, the back is darker, and the belly is almost golden yellow, round and without ribs. The tail fin is not bifurcated, and the other fins are round. Most of the fins are gray and black, and the iridescence is golden. It is not only a delicacy among fishes, but also an excellent product for breeding, viewing and fishing.