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Hormone Disruptors Broken Down by Sunlight, but Regenerate at Night
Trenbolone acetate, a synthetic anabolic steroid used as a growth promoter in more than 20 million cattle in the United States could be having a lasting impact the environment.

Cattle metabolize the steroid into compounds such as 17a-trenbolone, a potent endocrine disruptor commonly found in agricultural run-off water. In laboratory tests, just a few tens of nanograms of these compounds per litre can skew sex ratios and decrease fertility in fish.
Manufacturers argue that these metabolites pose little risk in rivers, because sunlight breaks them down rapidly.

After testing the 17a-trenbolone though several cycles of light and dark, scientists were surprised to see that levels rebounded during the dark periods. This information could help explain harmful effects in aquatic wildlife when concentrations tested during the day seemed too low to be harmful.

Endocrine disruptors are known to harm fish and there is growing evidence linking them to health problems in human, including infertility and various cancers.

 
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Non-Native Species Impacts Plant and Animal Communities - Large colonies of alien crayfish can impact submerged aquatic vegetation — the plants that help aerate the water. Losing this vegetation reduces dissolved oxygen, which further degrades water quality.


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