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Every part of the male Guppy helps him to attract a potential partner who will let him impregnate her. From his size, to his colouring, to his fins it all counts. However the actual bit that transfers his milt (sperm) into her is called a "gonopodium". It is a modified anal fin situated on the underside of the fish between the ventral fins and the caudal (tail) fin

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16y ago

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