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Swordtails are some of the easiest fish for amateur aquarist to breed, if the conditions of the tank are appropriate and it contains both males and females reproduction will occur without intervention. Often all female groups which have come from a mixed gender tank will be pregnant on arrival, creating a breeding population when the fry sexually mature at around three months of age, later stages of pregnancy can be seen without much difficulty as a dark gravid spot will develop near the anal fin. Males can be distinguished from females by the presence of a Gonopodium, a modified anal fin used to impregnate the female during breeding. A ratio of one male to three or four females is recommended to ensure that individual females will not be overly harassed to breed.
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