Journal Article

Verification of first annulus formation in the illicia and otoliths of white anglerfish, <i>Lophius piscatorius</i> using otolith microstructure

P. J. Wright, D. A. Woodroffe, F. M. Gibb and J. D. M. Gordon

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 59, issue 3, pages 587-593
Published in print January 2002 | ISSN: 1054-3139
Published online January 2002 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1006/jmsc.2002.1179
Verification of first annulus formation in the illicia and otoliths of white anglerfish, Lophius piscatorius using otolith microstructure

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Microincrements in the lapilli otoliths of Lophius piscatorius L. were used to validate the age of fish <27 cm TL collected in spring and autumn. Contrary to published estimates of size at age based on illicia by Dupouy et al. (1986) and Duarte et al. (1997), these small specimens were found to be either 0- or 1-group. Comparison between the macrostructures of illicia and sagittae indicated that a translucent zone is formed in the illicia of most 0-group by autumn but not in sagittae. Hence, earlier estimates of small size at age may have arisen from incorrect interpretation of the time of first translucent zone formation in illicia. In addition to enabling age validation, microstructure provided a means of distinguishing between the translucent material that forms false rings and annuli. Annuli appeared as a sequence of gradually declining increment widths whereas false rings were characterized by an abrupt check in otolith formation followed by increments similar in width to adjacent opaque material. The implications of these findings to age reading and interpretation are discussed.Copyright 2002 International Council for the Exploration of the Sea. Published by Elsevier Science Ltd. All rights reserved.

Keywords: anglerfish; daily increment analysis; Lophius piscatorius

Journal Article.  0 words. 

Subjects: Environmental Science ; Marine and Estuarine Biology

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