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To infer the distribution pattern of introduced rainbow trout, Oncorhynchus mykiss, we compared abiotic factors among tributaries with and without rainbow trout in the Atsuta River, Hokkaido, Japan. Rainbow trout were present in 10 of the 24 tributaries. Stepwise logistic regression analysis indicated that the occurrence of rainbow trout was more likely in low-gradient tributaries and was negatively...
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