Curious about the gender of your koi? There are a few key differences to look for! Female koi tend to have rounder, fuller bodies, while males stay sleek and streamlined no matter how much they eat.

During spawning season, males develop small, rough bumps on their gills and pectoral fins—this helps them during mating.

As the weather warms up and your koi start swimming near the surface again, take a closer look. With a little observation, you can start identifying the males and females in your pond!