Abstract：
:Migration behaviour and estuarine mortality of cultivated Atlantic salmon Salmo salar smolts in a 16 km long estuary were studied using two methods: (1) acoustic telemetry and (2) group tagging in combination with trap nets. Progression rates of surviving individuals through the estuary were relatively slow using both methods [0·38 LT (total length) s-1 v. 0·25 LT s-1 ]. In 2012, the progression rate was slow from the river to the estuary (0·55 LT s-1 ) and the first part of the estuary (0·31 LT s-1 ), but increased thereafter (1·45-2·21 LT s-1 ). In 2013, the progression rate was fast from the river to the estuary (4·31 LT s-1 ) but was slower thereafter (0·18-0·91 LT s-1 ). Survival to the fjord was higher in 2012 (47%) compared to 2013 (6%). Fast moving individuals were more likely to migrate successfully through the estuary compared to slower moving individuals. Adult recapture of coded-wire-tagged S. salar was generally low (0·00-0·04%). Mortality hot spots were related to topographically distinct areas such as the river outlet (in 2012) or the sill separating the estuary and the fjord (in 2013). At the sill, an aggregation of cod Gadus morhua predating on cultivated smolts was identified. The results indicate that slow progression rates through the estuary decreases the likelihood of smolts being detected outside the estuary. The highly stochastic and site-specific mortality patterns observed in this study highlight the complexity in extrapolating mortality patterns of single release groups to the entire smolt run of wild S. salar.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Vollset KW,Mahlum S,Davidsen JG,Skoglund H,Barlaup BTdoi
10.1111/jfb.13097subject
Has Abstractpub_date
2016-10-01 00:00:00pages
1974-1990issue
4eissn
0022-1112issn
1095-8649journal_volume
89pub_type
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