PORTER, Ind. (AP) _ The Asian carp's ability to adapt to its surroundings is alarming Indiana officials who are trying to keep the invasive species from spreading in the state's waterways.

Purdue University assistant professor Reuben Goforth tells The Times in Munster that the gills are changing on some species of Asian carp in the Wabash River. That makes them stronger and a greater threat to the river's native species.
 
He says students collecting data on Asian carp eggs found 300,000 eggs in three minutes in June. The most they had found previously was 1,000 in five minutes.
 
Federal Asian carp czar John Goss says an electric barrier in Chicago is keeping the fish from entering Lake Michigan. He says researchers are seeking a toxin that would affect only Asian carp.