How do guppies have sex

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TORONTO, ON - Some males will go to great lengths to pursue a female and take extreme measures to hold on once they find one that interests them, even if that affection is unrequited. New research from evolutionary biologists at the University of Toronto shows that the male guppy grows claws on its genitals to make it more difficult for unreceptive females to get away during mating. Genitalia differ greatly in animal groups, even among similar species - so much so that even closely related species may have very different genitalia. The reasons for these differences are unclear but sexual conflict between males and females may be a source. Sexual conflict occurs when the fitness interests of males and females differ, which is rooted in differences in egg and sperm sizes.
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Sexual harassment in the fish world—male guppies suffer most

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Male guppies ensure successful mating with genital claws | EurekAlert! Science News

The guppy Poecilia reticulata , also known as millionfish and rainbow fish , [2] is one of the world's most widely distributed tropical fish and one of the most popular freshwater aquarium fish species. It is a member of the family Poeciliidae and, like almost all American members of the family, is live-bearing. They are highly adaptable and thrive in many different environmental and ecological conditions. Wild guppies generally feed on a variety of food sources, including benthic algae and aquatic insect larvae. Guppies were first described in Venezuela as Poecilia reticulata by Wilhelm Peters in and as Lebistes poecilioides in Barbados by De Filippi in Then in , Rosen and Bailey brought it back to its original name, Poecilia reticulata.
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All rights reserved. Guppies are small freshwater fishes that are popular in aquariums around the world. Unlike many fishes, where males and females squirt sperm and eggs into the surrounding water, guppy males fertilise females by delivering sperm into their bodies. Instead, they have modified a fin into a penetrating organ called a gonopodium.
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February 14, Male guppies pay a high cost for their sexual harassment of female guppies — including much higher mortality rates — a new study from Macquarie University has found. Sexual harassment in guppies, or unwanted male attention, is a product of males attempting to mate as many times as possible due to the low energy cost of sperm production. In the study published in the journal Ethology , males spent more than 45 per cent of their day chasing females , and their mortality rate was more than three times higher when housed with females compared to being housed with males. In contrast to the males, females seemed to show very little costs of constant male attention other than a reduction in social behaviour schooling.
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