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Fish exposed to even small amounts of estrogen produce fewer males

Fish exposed to even small amounts of estrogen produce fewer males

A biologist conducted experiments with North American freshwater fish called least killifish. She found that fish exposed to estrogen in concentrations of 5 nanograms per liter in controlled lab conditions had fewer males and produced fewer offspring. Scientists have found estrogen at as much as 16 times that concentration in streams adjacent to sewage treatment plants.
Source: Fish exposed to even small amounts of estrogen produce fewer males

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