How to Tell Male and Female Red Swordtail Fish Apart? Teach You a Quick Way to Identify Males and Females

There are two ways to tell male and female red swordtail fish apart. The first is by body shape: the male has a slender body and bright coloration, while the female has a plump body and duller coloration than the male. The second is by the fins: the male has a sword extending below the caudal fin, and the tips of all its fins are relatively pointed; most noticeably, the anal fin has transformed into a gonopodium, while the female has relatively rounded and blunt fin tips, no sword below the caudal fin, no protruding gonopodium, and a more visible vent.

How Can You Tell a Red Swordtail Fish Is About to Give Birth?

1. When the female's belly swells and a black gravid spot appears, these are signs that she is about to give birth. You can scoop out the male; generally, the fry will be born after 1~2 days.

2. The fish's belly will swell, and it will be disinclined to move; if the male approaches her, she will bite him and chase him away. Red swordtail fish are similar to guppies in that they are ovoviviparous and give birth directly to live fry, but they will eat the fry.

The above is an introduction to how to tell male and female red swordtail fish apart, and we hope it is helpful to everyone.