Abstract
A thermal fish kill due to "cold shock" caused by a mechanical failure in the steam electric generating unit was observed in Lake Wabamun, Alberta on February 8, 1973 in the region of the discharge canal. The most rapid temperature decline occurred in the initial 30 min after shutdown when the temperature dropped 16.9 C (21.8 to 4.9 C). The major fish species affected included spottail shiners (Notropis hudsonius) and northern pike (Esox lucius). The freshwater clam Anodonta sp. did not appear to be affected.
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