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Female sex hormones can weaken the ability of fish to protect themselv

Harlequinmania

By Harlequinmania,
in General Reefkeeping_

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Harlequinmania

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It is well known that female sex hormones (estrogens) that end up in rivers and lakes, primarily via spillage from sewers and livestock farming, pose a threat to the environment. Some environmental toxins can also have the same impact as estrogens. One example of such substances are degradation products (metabolites) from the pollutant PCB.

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1000 Gallon Tank in the Hole 

http://www.sgreefclub.com/forum/topic/120957-1000-gallon-3d-hole-in-the-wall/ 

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