| Brought to Seattle for the World's Fair (probably the 1909 Alaska-Yukon Pacific Exposition); then dumped into a pond on the University of Washington campus and was later introduced into the Columbia River system. Scattered populations are found in Washington, California, Oregon, Idaho, Colorado, Connecticut, New Mexico, New York, Maryland and Delaware (Ref. 1998). The species is sometimes regarded as a nuisance. Introduced by the US Fish Commission for food and sport (Ref. 6029).
Ref:
Courtenay, W.R. Jr. and D.A. Hensley, 1980
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