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DNR Adds Largemouth Bass To Griffy Lake To Combat Carp

Indiana Department of Natural Resources officials in Bloomington have added adult largemouth bass to Griffy Lake in an effort to mitigate the lake's growing population of common carp.

DNR District 5 Fish Management Biologist Dave Kittaka says large numbers of common carp - which grow quickly - can ruin a fishery.

"These fish are primarily what they call insectivores - they eat insects off the bottom," he says. "They use their mouths to dredge up the sediment in search of their food. In that process, they severely degrade the water quality by suspending sediments and uprooting vegetation."

Kittaka says common carp - not to be confused with similarly invasive species Asian carp - were not originally part of the Griffy Lake equation.

"When we manage our reservoirs, lakes and ponds, the balance is very important to start off with because it's an artificial system - we're starting completely over," he says. "If we start off with the wrong ratio of predator versus prey, that's going to affect the population down the road."

And he says when he realized there was a population of common carp that needed to be addressed in the lake, he wasn't sure there was a way to do it.

That was until an opportunity to acquire adult largemouth bass came along.

"When that email came out telling me these fish were available, I thought this would be a perfect opportunity to add an additional large predator to a lake where, right now, the primary predators'…numbers just aren't there yet to control carp numbers," he says.

Although the bass may help control the carp population in Griffy Lake, Kittaka says it's unlikely the same solution would work in combatting the invasive Asian carp.

That species mostly lives in streams, and Kittaka says largemouth bass prefer lakes.

"I'm sure they do eat them," he says. "But the Asian carp reproduce at such a tremendous rate. There's really no magic bullet for them right now."

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