The way to distinguish between male and female goldfish lionheads is as follows: (a) the difference in external morphology:

(1) the difference in body shape: male goldfish generally have a slightly longer body shape, and female goldfish have a shorter and more rounded body. Females have an enlarged abdomen compared to males during the egg-laying period.

(2) Difference in caudal peduncle: males are slightly thicker than females.

(3) Differences in the pectoral fins: careful observation reveals that the males are slightly longer and more pointed, with the first pectoral fin spine being thicker and harder, while the females have a shorter rounded shape, with the first pectoral fin spine being less hard.

(4) Differences in cloaca: when viewed from the belly upwards, the male's cloaca is small, narrow and concave; the female's cloaca is large, slightly rounded and convex outwards.

(2) the difference in color: male and female goldfish, there is a slight difference in body color, the male fish is generally brightly colored, while the female fish is slightly lighter, in the reproductive development period, the male fish is more brightly colored.

(3) Sense of touch and motion: Use your hand to gently support the abdomen of the fish, and your middle and ring fingers will feel an obvious hard line on the abdomen of the male fish, while the abdomen of the female fish is softer. Walking through the edge of the fish pond, fierce foot observation, male fish swim fast and agile, female fish movement is slower.

(4) Star-chasing: As the temperature rises, the goldfish will show the second feature - star-chasing during the spawning period, which is the easiest and most accurate time to identify the sex of the goldfish, and it is also one of the easiest ways to identify. The male's chasing star appears on the first spine of the pectoral fins and the edge of the gill cover. More often than not, the chasing star grows on each fin of the whole pectoral fins, the front one is obvious, and the rear one has to be observed carefully to be able to see it. This rough little white spot is the chasing star.

Using the above identification methods, but also must rely on years of experience in breeding and usually careful observation, in order to accurately identify the male and female goldfish.