Officials say no invasive silver or bighead carp have been found during a recent search of Lake Erie, where the fish's genetic fingerprints turned up in water samples taken a year ago.
The Michigan and Ohio natural resources departments teamed with the U.S. Fish and Wildlife Service on a carp detection mission that began last week.
Officials say they took 500 additional water samples and used electric currents and nets to catch fish in Sandusky and Maumee bays, besides the Sandusky and Maumee rivers. That's where Asian carp DNA was found in water collected in August 2011.
Tammy Newcomb of the Michigan DNR said Thursday that no bighead or silver carp were among the fight that were caught.
Federal scientists will search for carp DNA in the new water samples.