Abstract
Fish tagging methods are important tools in the research and management of salmonids; the Carlin tag is widely used, especially in anadromous salmonids. However, this tagging method may interfere with fish behaviour and increase post-smolt mortality. To estimate Carlin-tag-inflicted mortality in Arctic charr, we used jet injection of alcian blue (colour tags) as a control. Recapture rates were higher for the colour-tagged fish than for the Carlin-tagged fish for both one- and two-year-old smolts. For one-year-old smolts in 1992, the recapture rate was 18.9% for colour-tagged fish and 10.0% for Carlin-tagged ones. For two-year-old smolts in the same year, 34.0% of colour- and 28.6% of Carlin-tagged fish were recaptured; in 1993, recapture rates were 17.2% and 6.3% for colour- and Carlin-tagged fish, respectively. Colour-tagged one-year-old Arctic charr also grew faster than their Carlin-tagged counterparts. No differences in growth rates were found between tagging methods in two-year-olds. These results imply that for hatchery-reared Arctic charr, survival rates using Carlin tagging may be half to one third that of colour tagging. Growth was also higher among colour-tagged fish, indicating that Carlin tags alter the behaviour of fish in the sea.
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Strand, R., Finstad, B., Lamberg, A. et al. The Effect of Carlin Tags on Survival and Growth of Anadromous Arctic Charr, Salvelinus Alpinus . Environmental Biology of Fishes 64, 275–280 (2002). https://doi.org/10.1023/A:1016091619937
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DOI: https://doi.org/10.1023/A:1016091619937