SHELLEY, Idaho (AP) -- State wildlife biologists say botulism may be the culprit for killing nearly 200 ducks at an eastern Idaho sewage lagoon.

The die-off involves several species, including mallards, wood ducks, green-winged and blue-winged teal and some Canada geese. The birds were recovered over the last few weeks at a Shelley Public Works sewage lagoon.

Idaho Department of Fish and Game investigators say clinical signs indicate signs of botulism, but are awaiting confirmation from toxicology tests.

Agency officials say the combination of low flows at the lagoon and high air temperatures created a large algae bloom. Those three factors, along with the breakdown of aerator's reduced oxygen levels in the lagoon, creating the perfect environment for the bacteria that emits the toxin tied to botulism.

Copyright 2009 The Associated Press.

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