The Chattahoochee River near Atlanta, Georgia, USA is a stocked tailwater trout (Salmonidae) fishery and rainbow trout (Oncorhynchus mykiss) have been found to spawn in selected warmwater tributary streams. Because these stocked fish enter non-stocked waters and produce offspring that reside year-round, they are technically invasive. One tributary in particular, Cabin Creek, has had documented spawning activity for three consecutive years since the stream was monitored. We chronicled the production of the 2006 year-class of rainbow trout in this small, warmwater tributary to the Chattahoochee River. Creek is one of the least urbanized in the area, protected from development within lands owned by the National Park Service, with high levels of forest cover, which facilitates rainbow trout young-of-year survival through the summer. Thus, the documented spawning and young-of-year survival of this invasive species appears to be indicative of high forested watershed integrity.
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