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Study shows Asian carp could establish in Lake Erie with little effect to fishery
Date:8/7/2014

According to a study published in the journal Conservation Biology by a group of scientists from the University of Notre Dame, Resources for the Future, U.S. Forest Service, University of Michigan and the NOAA Great Lakes Environmental Laboratory, if bighead and silver carp were to establish in Lake Erie, local fish biomass is not likely to change beyond observations recorded in the last 3 decades.

"Bighead and silver carp will continue to have access to the Great Lakes it is important understand what the consequences could be if they were to establish" Marion Wittmann, the paper's lead author and University of Notre Dame scientist, said. Since 1995 at least three bighead carp have been recovered from Lake Erie. There is no evidence to date whether bighead or silver carp are established in the lake.

The Notre Dame study used expert elicitation, a process of formalizing and quantifying experts' judgments to estimate Asian carp impact to Lake Erie fishery biomass, a method designed by co-author Roger Cooke, senior fellow with Resources for the Future. Federal agencies such as the U.S. EPA, NASA, U.S. Army Corps of Engineers and the U.S. Department of Transportation have successfully used similar expert elicitation in support of risk analysis and decision-making on issues ranging from food safety to radio-active waste management.

Eleven experts estimated that if the carp become established in Lake Erie, bighead and silver carp biomass in Lake Erie could range from close to zero but up to over 25 metric-tons/km2 which is greater than the sum of walleye and yellow perch biomass in Lake Erie.

Experts estimated that Yellow perch biomass would not decrease as a result of bighead and silver carp, and could possibly increase by 15 to 50% of recently recorded biomass for this fish in Lake Erie. Experts estimated that walleye biomass would most likely experience a small decrease of about 10% in Lake Erie. However, experts
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Contact: David Lodge
dlodge@nd.edu
574-631-6094
University of Notre Dame
Source:Eurekalert

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