Scientists say a new study on Asian carp's ability to find food in Lake Michigan reinforces the importance of preventing the invasive fish from getting a foothold in the Great Lakes.
FILE - In this June 13, 2012, file photo, Asian carp, jolted by an electric current from a research boat, jump from the Illinois River near Havana, Ill. A newly released study says if Asian carp reach Lake Michigan, they probably would find enough food to spread far and wide. Some experts have questioned whether there’s enough plankton in the lake to sustain the invasive carp away from shoreline areas. But the new report released Monday, Aug.
A study led by University of Michigan researchers found that despite a drop-off in plankton, the tiny plants and animals on which bighead and silver carp typically feed, the lake has enough dietary options to sustain individual fish that venture away from nutrient-rich shoreline areas where most would congregate.
Asian carp were imported in the late 1960s to gobble up algae in Deep South sewage lagoons and fish farms. They escaped into the Mississippi River and have migrated northward, branching into dozens of tributaries. Some experts have questioned whether the carp would venture from shallow bays and wetland areas into the lake’s deeper waters, where filter-feeding zebra and quagga mussels have coated the bottomlands and consumed huge volumes of plankton and nutrients such as phosphorus.
They concluded that the lake, with its average depth of 280 feet , has enough of the mussels’ fecal pellets to keep the carp from starving and even enable them to grow while seeking other fertile territory, such as Wisconsin’s Green Bay, Alsip said.Kevin Irons, aquatic nuisance species program director with the Illinois Department of Natural Resources, said Lake Michigan’s cold temperatures, depths and lack of food would pose challenges for the carp.
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