A paper, to be published Wednesday, suggests that some Asian carp have breached electronic barriers designed to keep them from entering the Great Lakes.
Four scientists prepared the article, published online by Conservation Letters. They report Asian carp DNA was detected in 58 samples taken from Chicago-area waterways over a period of nearly one year.
The group says that while its findings suggest the presence of bighead and silver carp, it is unclear how many live fish could be in the waters.
Michigan and other states have been warning that an invasion of Asian carp, which grow to four feet in length and weigh up to 100 pounds, could devastate the multi-billion dollar Great Lakes sport fishing industry.
Federal officials have contended that an electric barrier 25 miles south of Lake Michigan has thus far been successful in delaying the carp’s advance.
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