How to Determine the Sex of a Fish

Intermediate 10 min 11 steps 48988 views Rating: 4.4/5 Published: 2026-01-05

Compare the size of the fish during spawning season.. Look for a bump on the forehead of the fish to identify a male.. Watch for designs and growths during mating season.

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Steps

1

Compare the size of the fish during spawning season.

Step 1

Compare the size of the fish during spawning season.

2

Look for a bump on the forehead of the fish to identify a male.

Step 2

Look for a bump on the forehead of the fish to identify a male.

3

Watch for designs and growths during mating season.

Step 3

Watch for designs and growths during mating season.

4

Compare the size of the dorsal fins on cichlid fish.

Step 4

Compare the size of the dorsal fins on cichlid fish.

5

Watch for seasonal bumps on goldfish to identify a male.

Step 5

Watch for seasonal bumps on goldfish to identify a male.

6

Look for aggressive pleco fish to identify the males.

Step 6

Look for aggressive pleco fish to identify the males.

7

Spot triangular fins near the tail of guppies and mollies to identify a male.

Step 7

Spot triangular fins near the tail of guppies and mollies to identify a male.

8

Visit a local pet store or hatchery to talk to an expert.

Step 8

Visit a local pet store or hatchery to talk to an expert.

9

Consult online resources like informational videos and pictures.

Step 9

Consult online resources like informational videos and pictures.

10

Read about the types of fish that you have in your tank.

Step 10

Read about the types of fish that you have in your tank.

11

Ask questions on online forums to get answers from fish enthusiasts.

Step 11

Ask questions on online forums to get answers from fish enthusiasts.

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