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Otolith growth and age estimation in the European hake

AuthorsMorales-Nin, Beatriz ; Torres, G. J. ; Lombarte, Antoni ; Recasens, Laura
KeywordsMerluccius merluccius
Gulf of Lions
Age validation
Issue DateDec-1998
PublisherBlackwell Publishing
Fisheries Society of the British Isles
CitationJournal of Fish Biology 53(6): 1155-1168 (1998)
AbstractThe internal sulcal rings in Merluccius merluccius otoliths cannot be considered as annuli. In the absence of a strong seasonal Zeitgeber, hake otoliths in the Mediterranean did not lay down an interpretable ring pattern that would be useful for age determination. A total of 484 sagittal otoliths from specimens ranging between 6 and 94 cm L T was studied in monthly samples from the Gulf of Lions in 1989–1990. Transverse, burnt otolith sections was analysed with an image analysis system using enhanced and filtered images and using a fast Fourier transform (FFT) function to avoid subjectivity in ring interpretation. The otolith radius-fish length relationship showed allometric growth and sexual dimorphism. The ring pattern was consistent for the sulcal rings in both sexes. Changes in the marginal increment showed the formation of multiple sulcal rings, of both environmental and physiological origin. The ring pattern depended on the sex and sexual activity
Description14 pages, 7 figures, 1 table
Publisher version (URL)http://dx.doi.org/10.1111/j.1095-8649.1998.tb00239.x
Appears in Collections:(ICM) Artículos
(IMEDEA) Artículos
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