Head difference: the male fish has a slightly raised head and thick lips. The female has a relatively smooth head and thin lips. Dorsal fin difference: the dorsal fin of male fish is relatively long, and the tail of dorsal fin is relatively sharp. The dorsal fin of female fish is relatively short, and the tail of dorsal fin is relatively round and blunt. Tail fin difference: the tail fin end of male fish is relatively flat, and the length of the whole tail fin is also relatively long. The tail fin of female fish is round, blunt and fan-shaped, and the length of the whole tail fin is also relatively short. 1、 How to divide Ruby fish into male and female 1. Head difference: male Ruby fish have slightly raised head, thick lips, and slightly protruding mouth. The female Ruby fish has a relatively smooth head, thin lips and sharp mouth, but it will not protrude outward.
2. Dorsal fin difference: the dorsal fin of male Ruby fish is relatively long, and the tail of the dorsal fin is relatively sharp. The dorsal fin of female Ruby fish is relatively short, and the tail of dorsal fin is relatively round and blunt.
3. Tail fin difference: the tail fin end of male Ruby fish is relatively flat, and the length of the whole tail fin is also relatively long. The tail fin of female Ruby fish is round, blunt and fan-shaped, and the length of the whole tail fin is also relatively short.
4. Abdominal difference: this one is the difference in reproduction. Female Ruby fish have to lay eggs, so the abdomen will become larger during the breeding period. The abdomen of male Ruby fish does not increase significantly during the breeding period. 2、 Can male and female Ruby fish be raised together? Male Ruby fish can be raised together. They rarely conflict. But there are exceptions. If two fish really don't like each other, they may fight. Therefore, they can generally be raised in the same tank for a period of time. If they can live in peace, they can be raised together. If they fight each other, they need to be raised separately. （GongBaoDanYuZenMeFenGongMu，GongMuNengYiQiYangMa）