LINESVILLE, Pa. -- Officials are scrambling to figure out the cause of a fish kill at Pymatuning State Park in northwestern Pennsylvania.

Park officials say it doesn't appear the fish kill is affecting the carp that have made the park's Linesville Spillway a tourist attraction. The carp throng so thickly for bread tossed by visitors that ducks can walk on the fish.

Instead, 2,500 crappie, muskie, walleye and bass have died since May 16 in another part of the lake.

The Department of Environmental Protection has asked biologists to study the dead fish and today joined with the Fish and Boat Commission to issue a "Do Not Eat" consumption advisory for all species of fish taken from the Pymatuning Reservoir.