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Surface bands on deepwater squalid dorsal-fin spines: an alternative method for ageing Centroselachus crepidater

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Bands on the external surface of the second dorsal-fin spine proved to be a novel method of estimating the age and growth of Centroselachus crepidater. Bands that followed the shape of the spine base were enhanced with an alizarin red derivative. Internal bands in spine cross sections were also examined. The number of both external and internal bands increased with animal size, although most spines had more external than internal bands. External bands were more reliable and were assumed to be annuli. The rate of band formation differed after five bands had been formed, and internal bands ceased forming after 30 years. Females to 54 years old and males to 34 years old were examined. Maturity occurred over a wide age range, with estimates of 20 years for females and 9 years for males. The youngest pregnant female was 27 years old. The Francis reparameterized von Bertalanffy growth model found similar growth for males and females, and the von Bertalanffy equations were Lt = 96.12(1 – e(–0.072(t+6.13))) for females and Lt = 73.22(1 – e(–0.141(t+2.99))) for males.

L'étude des bandes sur la surface externe de la seconde épine dorsale s'est avérée être une nouvelle méthode d'estimation de l'âge et de la croissance chez Centroselachus crepidater. Nous avons accentué le contraste des bandes qui suivent la forme de la base de l'épine à l'aide d'un dérivé du rouge d'alizarine. Nous avons aussi examiné les bandes internes sur des coupes transversales d'épines. Le nombre de bandes, tant externes qu'internes, augmente en fonction de la taille de l'animal, bien que la plupart des épines portent plus de bandes externes qu'internes. Les bandes externes sont plus fiables et nous considérons qu'il s'agit d'annulus. Le taux de formation des bandes est différent après la formation des cinq premières bandes et la formation de bandes internes cesse au bout de 30 ans. Nous avons examiné des femelles d'âge maximal de 57 ans et des mâles de 34 ans. La maturité est atteinte sur une gamme étendue d'âges et nous estimons l'âge de la maturité à 20 ans chez les femelles et de 9 ans chez les mâles. La femelle gravide la plus jeune avait 27 ans. Le modèle de croissance de von Bertalanffy avec les paramètres déterminés par la méthode de Francis indique une croissance semblable chez les mêles et les femelles; les équations de von Bertalanffy sont Lt des femelles = 96,12(1 – e(–0,072(t+6,13))) et Lt des mâles = 73,22(1 – e(–0,141(t+2,99))).[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2006-03-01

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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