Verification of Atlantic sea scallop (Placopecten magellanicus) shell growth rings by tracking cohorts in fishery closed areas

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Abstract:

We tracked the growth of large cohorts of sea scallops (Placopecten magellanicus) at four sites located in areas closed to scallop fishing and compared the observed growth with that inferred from rings on sea scallop shells collected at the same sites. Stochastic growth transition matrices were constructed for each site based on the shell growth increments, assuming annual ring formation. These matrices were used to predict the annual growth of the scallops, which were compared with direct observations of growth obtained by repeated sampling. Additionally, the observed growth of the scallops was used to estimate the parameters of a stochastic von Bertalanffy model for each site, which were used to estimate the mean annual growth increments as a function of starting shell height. These were compared with the mean growth increments on the shells. There was a close correspondence, in most cases, between the observed growth and the growth inferred from the shell rings, implying that the shell rings were formed annually. The lack of fishing mortality in the areas meant that there was no confounding of size-selective fishing with growth and allowed us to track cohorts longer than would otherwise have been possible.

Nous avons suivi la croissance de grandes cohortes de pétoncles géants (Placopecten magellanicus) à quatre stations situées dans des zones interdites à la pêche de pétoncles et comparé la croissance observée à celle déduite de la lecture des anneaux de la coquille de pétoncles géants récoltés dans les mêmes stations. Nous avons élaboré des matrices stochastiques de transition de la croissance pour chaque station d’après les incréments de croissance des coquilles, en présupposant que la formation des anneaux de croissance est annuelle. Ces matrices ont servi à prédire la croissance annuelle des pétoncles, qui a pu être comparée aux observations directes de la croissance obtenues par échantillonnage répété. De plus, la croissance observée des pétoncles a servi à estimer les paramètres d’un modèle stochastique de von Bertalanffy pour chaque station qui ont permis d’estimer les incréments annuels moyens de croissance en fonction de la hauteur initiale de la coquille. Il y a, dans la plupart des cas, une forte correspondance entre la croissance observée et la croissance déduite des anneaux de la coquille, ce qui laisse croire que ces anneaux de la coquille se forment annuellement. L’absence de mortalité due à la pêche dans ces zones fait qu’il n’y a pas de confusion entre la pêche sélective en fonction de la taille et la croissance, ce qui nous a permis de suivre les cohortes pendant plus longtemps qu’il n’aurait été possible autrement.

Document Type: Research Article

Publication date: May 1, 2009

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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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