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Differences in the physiological status of Atlantic salmon smolts in three tributaries of the River Teno


Differences in the physiological status of Atlantic salmon smolts in three tributaries of the River Teno



Aquaculture 168(1-4): 85-94



ISSN/ISBN: 0044-8486

DOI: 10.1016/s0044-8486(98)00341-x

Physiological characteristics of wild Atlantic salmon smolts at the beginning of their migration were compared between three tributaries of the River Teno in northernmost Finland. Samples were collected during or just prior to the peak of smolt migration. Two of the tributaries are not spawning rivers but juveniles ascend into them from the main stem. The smolts in these tributaries were significantly larger when compared to those in a spawning tributary. Though smolts of all the tributaries survived a salt water challenge test, significant differences were found in the physiological smolting indices of the smolts between the rivers. The energy stores of smolts were significantly smaller in the spawning river than in the two other tributaries. The smolts sampled at the beginning of the main migration showed high concentrations of plasma glucose and protein and a low one for chloride ion, all reflecting an early state of smolting. The size differences of the smolts between the tributaries did not explain the physiological differences of the smolts, but the physiological status of the smolts was dependent on the tributary.

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Accession: 010462204

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