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Mercury in fresh water fish

by Angeline Booher / August 21, 2009 12:36 AM PDT
A study released by the U.S. Geological Survey found mercury in every freshwater fish from nearly 300 streams that were tested, an astonishing result because mercury has usually been associated with large saltwater fish.

After testing mercury levels in more than 1,000 fish over seven years, the USGS is warning Americans to limit the amount of large, predator freshwater fish they eat, such as large-mouth bass, pickerel, walleye and some catfish.


The lists of highs and lows:


I live downstream of a chemical plant that was often fined for polluting the river. When I see what people throw in, I woldn't eat anything caught from these waters.

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Where can I get some of these fish?
by Steven Haninger / August 21, 2009 5:21 AM PDT

My mercury levels are below the mean. Happy

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(NT) (Chuckle!) :-)
by Angeline Booher / August 21, 2009 5:50 AM PDT
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The problem with mercury
by Roger NC / August 21, 2009 12:01 PM PDT

and some other heavy metal contaminants, is it accumulates in higher and higher doses up the food chain.

You take a 100 2 lb fish with one ounce of merury each. They get eaten by 50 larger fish that now have 2 ounces each. They get eaten by 10 larger fish that now have 20 ounces each. All of those get eaten by a single large fish, and it has 200 ounces of mercury in it's tissue. And

A crude over simple example, but it's easy to see. Mercury never leaves a body once it is absorbed in the tissues.


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Not quite that concentration
by Steven Haninger / August 21, 2009 7:25 PM PDT

You won't find a 2 lb fish with an ounce of mercury in it. I found

this table

that gives some numbers. And, mercury does leave the body though very, very slowly. So, if your rate of intake is greater than the rate of expulsion, it will accumulate to the point of being toxic.

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(NT) that'll pay the cannibals back!
by James Denison / August 22, 2009 4:46 AM PDT
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The contamination of watersheds and groundwater by
by Ziks511 / August 22, 2009 11:27 PM PDT

businesses and individuals is one of the legacies of 18th and 19th century law making where the rights of companies were defended more strongly than the rights of the individual. If you poison one person, you get arrested for any number of crimes from simple assault up to Second Degree Murder. But if a company or a corporation does the same thing, it requires the most strenuous proof and the most incredibly drawn out court cases, and rarely if ever do Company officers who ordered the practice ever go to jail.

It is my understanding that the settlement from the Love Canal site in Niagara Falls New York has still not been fully paid.

Sadly there is a case in northern Ontario north of Lake Superior whenre Reed Paper has contaminated much of an entire watershed leading into Lake Superior and which is the primary hunting and fishing area for the native population there. I know that the Federal Department of Native Affairs was trucking in drinkable water, but I have heard nothing further regarding the court case, and the natives are now dependent on commercially available food, which isn't healthy for regular folks and is particularly bad for natives causing obesity and Type II Diabetes.


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