Ten of thousands of other species of fish, from gizzard shad to drum, floated to the surface of the waterway Thursday after authorities dumped more than 2,000 gallons of toxins into a nearly six-mile stretch of the waterway the evening before.

The toxins were dumped while an electrical barrier normally used to prevent any Asian carp from the Great Lakes was turned off for maintenance. The kill operation — which will require the removal of an estimated 200,000 pounds of dead fish to a landfill — began Wednesday and was expected to last until Saturday.

The Asian carp — which can grow to 4 feet — were imported by Southern fish farms but escaped into the Mississippi River in large numbers during flooding in the 1990s and have been making their way northward ever since. No Asian carp have yet been found in Lake Michigan. -Associated Press

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