http://www.abc.net.au/news/2015-04-01/b ... ts/6365196New research has shown traces of a potent androgenic steroid used to beef up Australian cattle can cause male guppies to forcibly mate with unconsenting female guppies.
Trenbolone is an endocrine-disrupting chemical that has been banned in the European Union since 1988, but is widely used in beef production in Australia, the United States, South America, Japan and New Zealand.
In the study, scientists from Monash University and Abo Akademi University in Finland exposed guppies to extremely low concentrations of the steroid to mimic the levels caused by agricultural run-off.
They then monitored the mating behaviour of the fish.
Monash PhD candidate Michael Bertram said male fish exposed to the steroid stopped exhibiting their usual elaborate mating behaviour.
"Usually they'll either dance for the female, which involves the male sort of presenting himself in front of the female, hanging in the air in front of her," Mr Bertram said.
"So he will kind of get in front of her and display his colours and then if she is receptive, he will move up behind her and fertilise the female."
Instead, researchers found male guppies who had been exposed to Trenbolone at just 22 parts per trillion were using what scientists call a "sneaking behaviour" to mate with females from behind, without any courtship efforts.
Beef Steroid Turns Male Guppies Into Rapists
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Beef Steroid Turns Male Guppies Into Rapists
This is probably why European males aren't macho idiots like us Aussies and Merkins.
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