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The onset of downstream movement of juvenile Atlantic salmon, Salmo salar L., in a chalk stream

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The downstream movements of wild Atlantic salmon, Salmo salar L., from their established feeding territories in the River Itchen, Hampshire, UK, were logged continuously over an 11-month period using a passive integrated transponder (PIT) antenna system. The time of these movements was then related to a number of monitored and calculated environmental parameters. Initial downstream movement of smolts in April was correlated with the onset of darkness, at which time salmon moved from their established feeding territories alone. No relationship was found between the number of smolts migrating and river flow or maximum daily water temperature. The timing of downstream movement of parr between October and March was random with regard to sunset and time of maximum daily water temperature, suggesting the environmental cue that initiates movement may be different outside the spring smolt period.
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Keywords: Salmo salar; juvenile salmon; movement; passive integrated transponder (PIT)

Document Type: Research Article

Affiliations: The Centre for Environment, Fisheries and Aquaculture Science, Lowestoft, Suffolk, UK

Publication date: 2002-04-01

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