1) Differences in external morphology:

1 Differences in body shape: petsnet learned that male gold fish are generally slightly longer in size, while females Goldfish have short and round bodies. During pregnancy, the female fish has a larger abdomen than the male fish.

The difference between the 2 tail stalks: males are slightly thicker than females.

3 Differences in pectoral fins: Careful observation shows that the male fish is slightly pointed and long, and the first pectoral fin spine is thicker and harder; the female fish is short and round, and the first pectoral fin spine is not too hard.

4 Differences in the cloaca: looking up from the belly, the male cloaca is small, narrow and long, concave; the female cloaca is large and slightly round, convex outward.

2) The difference in color and lustre: There are slight differences in body color between male and female goldfish. The male fish is generally brightly colored, while the female fish is slightly lighter. During the reproductive development period, the male fish has a brighter body color.

3) Feeling and dynamic: Hold the abdomen of the fish lightly with your hand, and feel a hard line on the abdomen of the male fish with the middle and ring fingers, while the abdomen of the female fish is softer. When walking by the edge of the fish pond, stomping on the feet to observe, the male fish swims fast and agile, while the female fish moves slower.

4) Star chasing: As the temperature rises, goldfish will have the second feature - star chasing during the spawning period. This is the easiest and most accurate time to distinguish the gender of goldfish, and it is also the easiest to master. a method of identification. The star chasing of male fish appears on the first spine of the pectoral fin and the edge of the operculum. For a long time, there are star chasing on each fin of the entire pectoral fin. The front end is obvious, and the back must be carefully observed. This fine white spot is the star chasing. .

Using the above methods of distinction, it is necessary to rely on years of experience in breeding and careful observation in order to accurately distinguish male and female goldfish.