Which major drainage system confirms established introduced populations according to the NAS database?
Answer
Columbia River basin
The expansion of the white catfish population beyond its native range in the Eastern and Central United States involved intentional introductions into other large watersheds. The U.S. Geological Survey Nonindigenous Aquatic Species (NAS) database specifically verifies these established non-native populations. While the Great Lakes basin is mentioned as another area of introduction, the text explicitly names the Columbia River basin as another major drainage system where these introduced populations have taken hold. These successful introductions showcase the species' high degree of adaptability outside its original ecological niche.
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