How to Tell if It's a Male or Female Flowerhorn Fish

If you want to tell the difference between a male and a female Flowerhorn fish, you won't have to look any further than inside your fish tank. That's because Flowerhorn fish have never lived outside of captivity. They are a hybrid fish, created through breeding techniques over the years. So check out your fish tank and look for the few signs that can help you tell the difference between the males and the females.

Things You'll Need

  • Flowerhorn fish
  • 200 liter tank
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Instructions

    • 1

      Wait until your Flowerhorn fish has reached at least 4 inches (10 cm) in length before you try to determine which sex it is. Differentiated features haven't fully developed before they enter this stage of their lives.

    • 2

      Identify the shape of the anal pore on each Flowerhorn fish. A female's will be shaped like a "U," while a male's will be shaped like a "V."

    • 3

      Compare the hump sizes of each Flowerhorn fish. The Flowerhorn fish is known for its large hump on the top of its head, and as the fish become adults, the male will grow a larger hump than the female.

    • 4

      Pay close attention to the actions of each fish during the breeding process. Once the female Flowerhorn fish lays her eggs, she will stay close to them. The male, on the other hand, will protect the surrounding area to make sure other fish stay away from the eggs.