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    Male Lampreys Heat Up Before Sex

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    Geo Beats

    by Geo Beats

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    According to a study from Michigan State University, male sea lampreys heat up their bodies when a female gets close to them.

    According to a study from Michigan State University, male sea lampreys heat up their bodies when a female gets close to them.

    This is a mating technique that scientists were previously unaware of.

    Fat cells next to the anterior dorsal fin of the mature male lampreys increases their body temperatures by approximately point 5 degrees Fahrenheit.

    This is the first time researchers have observed a thermogenic heat producing body part in a cold blooded animal.

    Since lampreys die after mating, they use up all of their energy producing this heat from their bodies.

    They also release a pheromone to attract the females, and then when an ovulating female lamprey comes by, the males turn up the heat.

    Professor Weiming Li, a neurobiologist from Michigan State University that worked on the study said: “We initially thought this might be a mechanical device. Females are more passive and the male will wrap its body around the female's belly, almost like he's stripping the eggs out of her.”

    Lampreys are a parasite that attach themselves to larger fish and suck their blood and bodily fluids.