Endocrine Disruptors In Their Environment Had Changed Majority Of Male Fish Into Females

Necropsy of a largemouth bass. Photo by Luke Iwanowicz.

Speaking of endocrine disruptors contributing to weight gain, I saw:

A Sex Change Phenomenon In Fish Suggests There Is Something In The Water, Mongabay, 5 April 2016

A new study* published in Ecotoxicology and Environmental Safety finds that male fish are turning into females – a phenomenon known as intersex – due to chemical pollution, specifically estrogenic endocrine disrupting chemicals or EEDCs.

Researchers have found evidence [“having female egg cells in their testis“] of intersex in 85 percent of smallmouth bass (Micropterus dolomieu) and 27 percent of largemouth bass (Micropterus salmoides) tested on 19 National Wildlife Refuges from Maine to Virginia.

“It’s hard not to make the leap to ask if fish are effected, then are amphibians, birds, wildlife, and then are humans?” noted Luke Iwanowicz, lead scientist with U.S. Geological Survey (USGS), on the study.

At certain concentrations, estrogen, the primary female sex hormone, is capable of derailing the natural hormone system of fish, wildlife, and humans. … It can cause reduced sperm count and viability, reproductive failure, and population decline.

Researchers also found that EEDCs were present in all types of water bodies sampled — rivers, reservoirs, lakes, ponds, and effluent.

One active ingredient in birth control pills, a very potent estrogen, is known to pass right through waste water treatment plants.

* Evidence Of Estrogenic Endocrine Disruption In Smallmouth And Largemouth Bass Inhabiting Northeast US National Wildlife Refuge Waters: A Reconnaissance Study, Ecotoxicology and Environmental Safety, February 2016

Highlights:
– Intersex in male smallmouth bass ranged from 60% to 100%.
– Intersex in male largemouth bass from ranged from 60% to 100%.
– Estrogenic activity was above the PNOEC (probable no effects concentration, 0.73 ng E2/L) from 73% of sites.

Endocrine disruptors can act like estrogen, feminizing males of the species.

The thing about hormones – natural or synthetic – is that you only need a tiny bit to have a profound effect.

Did you know that glyphosate, the active ingredient in Monsanto’s weedkiller Roundup is an endocrine disruptor?

Glyphosate-Based Herbicides Are Toxic And Endocrine Disruptors In Human Cell Lines, Toxicology, August 2009

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