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What is an andropodium?

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Anonymous

 ∙ 9y ago
Updated: 8/21/2019

An andropodium is a modified anal fin of certain types of livebearing fish.

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Wiki User

 ∙ 10y ago

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What is a gonopodium?

In many species of fish, fins have been modified to allow internal fertilization. A gonopodium is an anal fin that is modified into an intromittent organ in males of certain species of live-bearing fish in the families Anablepidae and Poeciliidae. It is movable and used to impregnate females during mating. The male's anal fin's 3rd, 4th and 5th rays are formed into a tube like structure in which the sperm of the fish is ejected. In some species, the gonopodium may be as much as 50% of the total body length. Occasionally the fin is too long to be used, as in the "lyretail" breeds of Xiphophorus helleri. Hormone treated females may develop gonopodia. These are useless for breeding. One finds similar organs having the same characteristics in other types of fish, for example the andropodium in the Hemirhamphodon or in the Goodeidae. When ready for mating, the gonopodium becomes "erect" and points forward, towards the female. The male shortly inserts the organ into the sex opening of the female, with hook-like adaptations that allow the fish to grip onto the female to insure impregnation. If a female remains stationary and her partner contacts her vent with his gonopodium, she is fertilized. The sperm is preserved in the female's oviduct. This allows females to, at any time, fertilize themselves without further assistance of males. [1][1] http://en.wikipedia.org/wiki/Gonopodium#Internal_fertilization

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