• Ovipositor

The ovipositor is an external sexual organ in the female of some fish, which is a modified urogenital papilla that elongates during spawning. It consists of a maximum of three pairs of appendages that are used to transfer the egg, prepare a place for it and position it correctly.

For example, Rhodeus sericeus has an ovipositor, a modified anal fin used to lay eggs in the mantle cavity of pond molluscs.

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