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Should all fish in mark-recapture experiments be double-tagged? Lessons learned from tagging coastal cod (Gadus morhua)
Björnsson, B.; Karlsson, H.; Thorsteinsson, V.; Solmundsson, J. (2011). Should all fish in mark-recapture experiments be double-tagged? Lessons learned from tagging coastal cod (Gadus morhua). ICES J. Mar. Sci./J. Cons. int. Explor. Mer 68(3): 603-610. http://dx.doi.org/10.1093/icesjms/fsq187
In: ICES Journal of Marine Science. Academic Press: London. ISSN 1054-3139; e-ISSN 1095-9289
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| Trefwoord |
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| Author keywords |
cod; double-tagging; mark-recapture; tag detection; tag loss; tagreporting |
| Auteurs | | Top |
- Björnsson, B.
- Karlsson, H.
- Thorsteinsson, V.
- Solmundsson, J.
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| Abstract |
Cod (Gadus morhua) were tagged outside and inside “herds” formed by anthropogenic feeding in an Icelandic fjord. Recapture rates were twice as high for fish double-tagged with one surgically implanted electronic tag and one anchor tag (46.6 and 62.2%) than with fish tagged with only a single anchor tag (20.0 and 29.2%) outside and inside the herds, respectively. The two main reasons for the differences observed in recapture rates were higher detection and reporting rates for the double-tagged fish. In cage experiments, 8% of the fish receiving implanted tags died during the first 2 d after tagging. For double-tagged fish, tag loss was ~10% for both tag types. About 80% of the tags were returned by fishers and 20% by fish processors. The tag detection rate by fishers was estimated at ~45 and ~80% for single- and double-tagged fish, and the reporting rate at ~74 and ~100% for single- and double-tagged fish, respectively. It is proposed for future tagging studies to double-tag all fish routinely, placing one tag dorsally and one ventrally, to enhance the detection rate and to account for tag loss. |
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