Development of schooling behaviour during the downstream migration of Atlantic salmon Salmo salar smolts in a chalk stream

The downstream migratory behaviour of wild Atlantic salmon Salmo salar smolts was monitored using passive integrated transponder (PIT) antennae systems over 10 years in the lower reaches of a small chalk stream in southern England, U.K. The timing of smolt movements and the likely occurrence of scho...

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Bibliographic Details
Published in:Journal of fish biology 2014-10, Vol.85 (4), p.1042-1059
Main Authors: Riley, W. D., Ibbotson, A. T., Maxwell, D. L., Davison, P. I., Beaumont, W. R. C., Ives, M. J.
Format: Article
Language:English
Subjects:
anadromous species
Animal Identification Systems
Animal Migration
Animals
England
Fish
freshwater phase
Migration
movement
passive integrated transponder
Photoperiod
Rivers
Salmo salar - physiology
Salmon
salmonid
shoal
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Summary:The downstream migratory behaviour of wild Atlantic salmon Salmo salar smolts was monitored using passive integrated transponder (PIT) antennae systems over 10 years in the lower reaches of a small chalk stream in southern England, U.K. The timing of smolt movements and the likely occurrence of schooling were investigated and compared to previous studies. In nine of the 10 consecutive years of study, the observed diel downstream patterns of S. salar smolt migration appeared to be synchronized with the onset of darkness. The distribution of time intervals between successive nocturnal detections of PIT‐tagged smolts was as expected if generated randomly from observed hourly rates. There were, however, significantly more short intervals than expected for smolts detected migrating during the day. For each year from 2006 to 2011, the observed 10th percentile of the daytime intervals was
ISSN:0022-1112
1095-8649
DOI:10.1111/jfb.12457