1:Look at the size.

2:Look at the head shape.

3:After spawning, look at the genitals.

(The major premise of these three methods above:The fish is sexually mature. Flesh (size with fins removed) is at least 4cm or the fish is at least 10 months old. Only when this condition is met can we talk about distinguishing males and females. You can't tell the difference between a male and a female with a small fish of 2 or 3 centimeters. Please don't be misled by fish merchants).

The method of distinguishing the male and female of artificial swallowfish is basically the same, ink swallow, silver swallow, red-eye diamond swallow, zebra swallow, yin and yang swallow, panda swallow, etc. The method of distinguishing the male and female of artificial swallowfish is basically the same.