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Are morphometric indices accurate indicators of stored energy in herring Clupea harengus?

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The accuracy of the morphometric indices Fulton's K, somatic K and relative condition factor, Kn, as measures of individual North Sea herring Clupea harengus muscle fat content was investigated using the Distell Fish Fat meter. The accuracy of fat-meter readings from an individual fish was validated by comparison with Soxhlet extraction analysis. The studies conducted demonstrated that Fulton's K is not consistently or strongly correlated with individual C. harengus muscle fat content, as defined by the fat-meter estimates. The study shows that somatic K and Kn may be better indices of individual North Sea C. harengus muscle fat content than Fulton's K. These morphometric indices, however, should only be used after prior validation against a more direct measure of fat content.

Keywords: Fulton's K; condition; fat; fatmeter

Document Type: Regular Paper


Affiliations: Institute of Biological and Environmental Sciences, University of Aberdeen, Aberdeen AB24 2TZ, Scotland, U.K.

Publication date: March 1, 2010


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