Instructions
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Female guppies are larger, less colorful fish, while males are smaller and brightly colored.
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Inspect the caudal, or tail fin, distinctly defined by size in males and females. While both male and female caudal fins appear fan-shaped, the male's fin is much larger, more colorful, and has a flowing appearance.
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3
Notice the size and shape of the anal fin in both sexes, located approximately mid-way down the underside of the body. Females have a distinct fan-shaped fin, while males display a sword-shaped fin (gonopodium) used in mating.
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4
Note the size of the dorsal fin, located parallel to the anal fin, on the top side of the body. Males have a larger dorsal fin than females.
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