YANKTON, S.D. (AP) — Wildlife officials have used poison to kill all the fish in Lake Yankton in southeastern South Dakota to remove undesirable species such as carp.

Flooding in 2011 caused Missouri River water to backfill into the lake just west of Yankton and led to an increasing number of the invasive species.

Yankton Daily Press and Dakotan reports that work crews dumped about 700 gallons of poison into the lake on Wednesday.

The lake at Gavins Point Dam was lowered about four feet and anglers were allowed liberal fishing limits in preparation for the fish kill.

The poison is expected to take a week to detoxify. The dead fish will be allowed to decompose in the lake.

Officials say the lake will be restocked.

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