Why would you sex your fish?

Fish are obviously a key component in your aquaponics system and maintaining healthy fish populations means a healthier, more resilient system.

There are several reasons for sexing tilapia. From selecting for breeding to reducing aggression, there are some great reasons to figure out the sex of your fish.

Selecting Individuals for Breeding

If you’re thinking of breeding your fish, you’ll want to carefully select the males and females you use based on favorable traits that they display. First, though, you must select candidates from both genders.

Separating Genders to Reduce Agression

Many aquaponic growers use only male tilapia to avoid aggressive behavior that can be sparked by the presence of a female.

How to Identify Gender

The dye accentuates the anus and genitalia of the fish and the difference is clear.

Male tilapia have a tapered shape below the anus, whereas the female have a more rounded shape with a triangular indentation in the center.Male tilapia have a tapered shape below the anus, whereas the female have a more rounded shape with a triangular indentation in the center. In this picture, the female is on the left and the male is on the right.

Male tilapia are also usually smaller and more aggressive than females.