Research Document - 2002/076
An Evaluation of Georges Bank Yellowtail Flounder Age Determination Based on Otolith Thin-Sections
By Heath Stone and Peter Perley
Abstract
An evaluation of Georges Bank yellowtail flounder age interpretations using otolith thin sections collected from DFO surveys and commercial port samples was conducted. Age interpretations made within and between DFO and NMFS fisheries research laboratories were compared using age frequency tables, percent agreement (PA=(nagree/n)x100) and age bias plots to examine systematic difference (bias) and precision. Precise age determination was hampered by the presence of weak, diffuse or split opaque zones and strong checks that made interpretation of annulii subjective and difficult. The implications of using these age interpretations on the 1999-2001 DFO spring survey indices and the 2000 commercial fishery catch at age are examined and recommendations for future research are provided.
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