Journal
JOURNAL OF FISH BIOLOGY
Volume 89, Issue 3, Pages 1641-1650Publisher
WILEY-BLACKWELL
DOI: 10.1111/jfb.13066
Keywords
biotelemetry; migration; tag burden; transmitter effects
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Funding
- European Union's INTERREG IVA Programme [2859 'IBIS']
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Mortality rates of wild Atlantic salmon Salmo salar smolts implanted with acoustic transmitters were assessed to determine if mortality was size dependent. The routinely accepted, but widely debated, 2% transmitter mass: body mass' rule in biotelemetry was tested by extending the transmitter burden up to 127% of body mass in small [mean fork length (L-F) 1383mm, range 115-168mm] downstream migrating S. salar smolts. Over the short timescale of emigration (range 119-445days) through the lower river and estuary, mortality was not related to S. salar size, nor was a relationship found between mortality probability and transmitter mass: body mass or transmitter length: L-F ratios. This study provides further evidence that smolt migration studies can deviate from the 2% rule' of thumb, to more appropriate study-specific measures, which enables the use of fishes representative of the body size in natural populations without undue effects.
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