By Jon Copley. Female brown trout do it too, to dupe potential partners into premature ejaculation. The trick may help females avoid mating with undesirable males or attract more partners, biologists suggest. As courting pairs of brown trout prepare to spawn, both fish quiver violently with their mouths open.
BBC - Earth - Fish faking orgasms and other lies animals tell for sex
Animals are driven to find a mate by any means necessary, and that can mean telling some staggering lies. Boy, was he right. There are all sorts of obstacles to a successful relationship, but perhaps there's none bigger than our tendency to lie all the time. Animals are just as deceitful towards their lovers. The drive to attract a mate, make sure no one else gets near them, and have offspring has driven animals to get up to all sorts of trickery. Take a female brown trout.
Fish reproduce by squirting out eggs and fertilising them, so where's the joy in that? Is there any form of pleasure that fish can experience through reproducing? We explore this fishy conundrum in Question of the Week.
After watching pairs of trout couple in an aquarium, biologists at Sweden's National Board of Fisheries have discovered that female trout deceived males on 69 occasions. As the courting pairs of fish prepared to spawn, both quivered violently with their mouths open. In usual circumstances, the pair would then share sexual congress by simultaneously releasing eggs and sperm to maximise the chances of fertilisation.