Direct Validation of Annual Growth Increments on Sectioned Otoliths from Adult Arctic Grayling and a Comparison of Otolith and Scale Ages
| Autor: | Randy J. Brown, Alfred L. DeCicco |
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| Rok vydání: | 2006 |
| Předmět: |
Scale (anatomy)
Ecology biology Grayling Management Monitoring Policy and Law Aquatic Science biology.organism_classification Body weight Annual growth % Mark and recapture Fishery Geography medicine.anatomical_structure Arctic medicine geographic locations Ecology Evolution Behavior and Systematics Thymallus arcticus Otolith |
| Zdroj: | North American Journal of Fisheries Management. 26:580-586 |
| ISSN: | 1548-8675 0275-5947 |
| Popis: | Accurate ages are essential for the responsible management of fish populations, and validation of ages ensures that accurate age estimates are available to managers. Scales have typically been used to estimate ages of Arctic grayling Thymallus arcticus in Alaska; however, the recapture of marked fish after several years at large has cast doubt on the accuracy of scale ages for this species. To validate age determinations from otoliths, we used oxytetracycline (OTC) to mark 102 Arctic grayling from the Eldorado River, Seward Peninsula, Alaska, during 1994 and 1995. Fish were tagged, fin-clipped, weighed, and injected with 25 mg of OTC/kg of body weight. Over the succeeding 4 years, 16 OTC-marked Arctic grayling were recaptured. Fluorescent marks were visible in thin-sectioned otoliths from 15 of the 16 recaptured fish, and annuli that were visible beyond the mark accurately recorded the passage of years between mark and recapture in all otoliths with OTC marks. Ages assigned from scales underestim... |
| Databáze: | OpenAIRE |
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