Longitudinal Length Back-Calculations from Otoliths and Scales Differ Systematically in Haddock

Autor: Hannes Baumann, Sandra J. Sutherland, Richard S. McBride
Rok vydání: 2013
Předmět:
Zdroj: Transactions of the American Fisheries Society. 142:184-192
ISSN: 1548-8659
0002-8487
DOI: 10.1080/00028487.2012.728168
Popis: Parallel macrostructure analysis of otoliths versus scales was conducted on Georges Bank Haddock Melanogrammus aeglefinus sampled in spring 2011 to test whether annuli widths of both structures yield comparable estimates of back-calculated length at age. While generally similar in number, scale and otolith annuli were found to differ systematically in their relative widths, mainly because initial annuli are deposited closer to the origin in scales than in otoliths. Accounting for the delayed onset of scale versus otolith formation did not remove the systematic bias. To make both structures comparable, we developed an age-independent correction approach that can adjust cumulative relative annuli widths (RAWs) of Haddock scales to otolith RAWs by the quadratic formula log e (RAW oto ) = 0.7244·log e (RAW scale ) + 0.0751·log e (RAW scale )2. Our study comprises a necessary step towards extracting and comparing longitudinal growth data over the entire time series of archived Haddock scales (1931–199...
Databáze: OpenAIRE
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