Transgender Fish? Yep….
By angelamontana


Apparently, one fifth of male fish are now “transgender because of chemicals from the contraceptive pill being flushed down household drains,” according to a study.  An article from Telegraph.co.uk, male river fish have reduced sperm rate and are even producing eggs.  The report says the male fish are also displaying “less aggressive and competitive behavior, which makes them less likely to breed successfully.”

The study shows that contraceptive pills, by-products of cleaners, plastics and cosmetics being flushed down the toilet and drains are all causing these fish to turn transgender.

Many other chemicals that are discharged through sewage treatment works can affect fish, including antidepressant drugs that reduce the natural shyness of some fish speciesProfessor Charles Tyler

“Using specially created transgenic fish that allow us to see responses to these chemicals in the bodies of fish in real time, for example, we have shown that oestrogens found in some plastics affect the valves in the heart.”

Professor Tyler will present his findings in the opening lecture of the 50th Anniversary Symposium of the Fisheries Society in the British Isles at Exeter University from July 3 to 7.

Dr Steve Simpson, who has organised the symposium, said the week of talks would give “fish biologists from around the world a chance to exchange ideas and discuss how to protect dwindling fish populations in rapidly changing seas and rivers, before it is too late.”

So, there you have it.  Just because you think a fish is male, doesn’t mean it is–and vice versa.

To read the full article, click here.

(Photo via Anglers Mail)





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