TRAVERSE CITY — Authorities plan another intensive search for Asian carp next week after repeatedly detecting DNA from the invasive fish in Chicago's Lake Calumet.
Officials said Friday that genetic material from silver carp was found in samples taken in May and June. Policy requires stepped-up efforts to find the fish whenever their DNA turns up during three consecutive rounds of sampling in the same area.
Lake Calumet is on Chicago's South Side. A live Asian carp was caught there in 2010 — the only one found beyond an electric barrier meant to keep them out of the Great Lakes.
Crews will use nets and electrofishing in their search from Tuesday through Friday. Among the nets will be a new type designed to prevent fish from moving in and out of the lake.