Fish From Iowa Lakes Exceed Mercury Level

Discussion in 'Fishing General' started by blake, Mar 12, 2008.

  1. blake

    blake Life Member

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    From the IDNR:

    Fish From Iowa Lakes Exceed Mercury Advisory Level

    DES MOINES - The Iowa Department of Natural Resources has confirmed the presence of mercury above consumption advisory levels in tissue samples from largemouth bass collected from Morman Trail Lake, Lake Geode, North Banner and South Banner lakes.

    Individuals should consume no more than one meal per week of largemouth bass caught from Morman Trail Lake, Lake Geode and North Banner and South Banner lakes.

    Mercury was also found above consumption levels in tissue samples from redhorse collected from the Upper Iowa River, prompting the DNR to issue an advisory for all species of fish caught from County Road 76 to County Road W20, in Allamakee County. Individuals should consume no more than one meal per week of any fish caught from the Upper Iowa River from County Road 76 to County Road W20.

    The Upper Iowa River was on the consumption advisory list previously for mercury in predator species, from the lower dam in eastern Winneshiek County upstream to County Road W20, northwest of Decorah. The new advisory extends the length of river covered by the advisory downstream and expands the advisory to include all species.

    Every year Iowa DNR biologists collect samples of fish for laboratory analysis to determine the wholesomeness of fish for human consumption. Edible portions of these fish are analyzed by certified labs and results are compared to consumption advisory levels as identified by the DNR and Iowa Department of Public Health in the state's consumption advisory protocol. The risk-based protocol went into effect in 2006 and is based on US EPA and FDA guidance. This protocol is the basis for issuing consumption advisories for Iowa waters.

    This marks the eleventh current consumption advisory for fish in Iowa.

    Iowa has an existing one meal per week consumption advisory for largemouth bass due to elevated levels of mercury in Nine Eagles Lake in Decatur County.

    Existing river advisories of one meal per week of predator fish species for mercury include the Cedar River from Floyd County north to the Minnesota border, mercury in the Upper Iowa River from the lower dam in eastern Winneshiek County upstream 24 miles and for mercury in the Volga River, including the Little Volga and the North Branch Volga River from the town of Volga upstream in Clayton County.

    Mississippi River Pool 12, which is the area between Lock and Dam 11 in Dubuque and Lock and Dam 12 at Bellevue in Jackson County, has a consumption advisory of one meal per week for walleye, sauger, largemouth bass, smallmouth bass, white bass and northern pike.

    The DNR has information on these contaminants and consumption advisories on its Fish and Fishing webpage at http://www.iowadnr.gov/fish/index.html then click on Fish Consumption Advisories in the navigation bar on the left.

    Fish are part of a healthy diet. For information on the benefits of eating fish or what types of fish are safe to eat, visit the Iowa Department of Public Health's webpage at:
    http://www.idph.state.ia.us/eh/common/pdf/enf/fish_health_issues.pdf

    CHLORDANE ADVISORY DROPPED AT TWO IOWA LAKES; NEW PCB ADVISORY ISSUED AT ONE LAKE

    The Iowa DNR has removed the one meal per week advisory due to elevated levels of chlordane in Cedar Lake in Cedar Rapids and the Ottumwa Lagoons in Ottumwa after samples collected in 2004 and 2006 showed chlordane was below the one meal per week advisory level.

    The advisory included carp and channel catfish at Cedar Lake and channel catfish at the Ottumwa Lagoons.

    Although the chlordane advisory has been removed at Cedar Lake, the current one meal per week advisory for carp and channel catfish due to elevated levels of Polychlorinated Biphenyls, referred to as PCBs, remains in place.

    The DNR has issued a new fish consumption advisory for Cedar Bend Lake, in Linn County. Individuals should consume no more than one meal per week of carp due to elevated levels of PCBs found in tissue samples collected in 2005 and 2006.

    For more information, contact Marion Conover, chief of fisheries, at 515-281-5208.
     
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  3. muddy

    muddy Administrator

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    DNR Biologists aren't the only ones out there collecting fish tissue. Unfortunately a lot of the streams/lakes we've been too have higher than what I'd consider safe levels as well.

    Unfortunate, very very unfortunate.
     
  4. Blaster

    Blaster PMA Member

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    That sucks. It will be very sad if a day comes were we can't eat fish out of our lakes and rivers!
     
  5. sofakingfast_1

    sofakingfast_1 Active Member

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    Does the high mercury level harm the fish?
     
  6. muddy

    muddy Administrator

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    No, the mercury and other heavy metals simply settle out in their body tissue. They could hurt them if they got really high.
     

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