Migration of wild juvenile chinook salmon Oncorhynchus tshawytscha during the first 80 km of their 254 km migration through the Rogue River, Oregon, was significantly slower than that during the last 170 km. Gill Na + , K + ‐ATPase specific activity did not increase significantly during the first 38 km of migration. Specific activities during the next 43 km did increase significantly. Specific activities continued to increase as the fish moved downstream, reaching a maximum within 44 km from the Pacific Ocean.
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Ewing et al. (2001) studied this question.
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