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• W749744898 abstract "Concern with the accuracy and precision of the current Greenland halibut (Reinhartius hippoglossoides) age determination method prompted us to examine two age validation methods, chemical marking with oxytetracycline (OTC) and bomb radiocarbon dating ( 14 C released during atmospheric testing of nuclear bombs in the 1960s). In addition we analyzed growth of tag-recaptured fish and the precision of three age determination methods, left whole otoliths, otolith sections and scales. Our growth model for tag-recaptured data suggests a growth rate of approximately 2-3 cm/yr for fish in the size range of 55-70 cm. Age bias plots comparing the age interpretations among structures showed that whole otolith age and otolith section age tended to be similar across all ages. However, both otolith preparations underestimated scale ages in older fish, particularly after age 15. Repeated age readings indicated that ageing precision was somewhat lower for the otolith-based methods (coefficient of variation of 8.4% and 11.1% for whole otoliths and otolith sections, respectively) than for the scale ages (5.2%). Three OTC marked otoliths were examined. One of these, a 66 cm female that had been at-large for 3 years, 10 months had an annual growth rate of approximately 1.5 cm/yr. The OTC mark was visible at the edge on the whole otolith but we could not determine what should have been 3 annuli within the new growth area. We were able to make out what we presumed to be three annuli on the otolith cross-section. However, in some areas of the section it was not as distinct as in others and the subsequent interpretation of annuli prior to the mark was difficult. The 14 C based age values of mature otoliths indicate that the ages for all but one of these samples were beyond the age determined by either the whole otolith method or the otolith section (the maximum observed age from whole and section ages was 20 years and from 14 C it was 33 years). While the section ages were somewhat closer to the minimum age determined by the 14 C we were not always able to match the assumed true age based on the 14 C. Comparable scale ages were not available." @default.
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• W749744898 date "2005-01-01" @default.
• W749744898 modified "2023-09-27" @default.
• W749744898 title "An Assessment of Age Determination Methods, with Age Validation of Greenland Halibut from the Northwest Atlantic" @default.
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