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Seston supply to sea scallops (Placopecten magellanicus) in suspended culture

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Abstract:

The filtration activity of dense aggregations of bivalves can locally reduce the concentration of seston, potentially limiting production. Under these conditions, the currents that supply seston cannot offset ingestion by the bivalves and the carrying capacity is exceeded. We conducted a field and modelling study to examine factors affecting seston supply to a culture of suspended sea scallops (Placopecten magellanicus) in Whitehaven Harbour, Nova Scotia. Even though seston flux to the scallops was reduced by 40% due to the attenuation of flow by culture gear, a reduction in seston concentration was not observed. The field data were then used to parameterize a quasi two-dimensional advection-diffusion model that quantified the relationship between the tidally driven seston supply and consumption by scallops. The model predicted a minimal reduction in seston concentration (<5%) within the lease (80 × 50 m), consistent with field observations. However, expanding the lease to occupy the area available for cultivation (1000 × 250 m) reduced the seston concentration in the centre of the lease by 20-50%, potentially limiting growth. Modelling results emphasized that by altering the lease geometry (lease width to length ratio), the supply of seston can be optimized.

Les activités de filtration opérées par de grands rassemblements de bivalves peuvent, à l'échelle locale, réduire la concentration du seston et, ainsi, potentiellement limiter la production. Dans de telles circonstances, les courants qui assurent la distribution du seston n'arrivent pas à compenser l'ingestion par les bivalves et le stock limite est alors dépassé. Des études sur le terrain et des modélisations ont permis d'étudier les facteurs qui affectent l'approvisionnement en seston d'une culture de pétoncles (Placopecten magellanicus) en suspension à Whitehaven Harbour en Nouvelle-Écosse. Bien que l'obstruction par l'équipement d'élevage ait diminué de 40% le flux du seston vers les pétoncles, il n'y avait pas de réduction de la concentration de seston. Les observations de terrain ont ensuite été intégrées dans un modèle d'advection-diffusion quasi-bidimensionnel qui permet de quantifier la relation entre l'approvisionnement du seston par la marée et la consommation par les pétoncles. La modèle prédit une réduction minime de la concentration du seston (<5%) à l'intérieur de la concession d'élevage (80 m × 50 m) qui correspond aux observations. Cependant, si on élargissait la concession de manière à couvrir toute la surface propre à l'élevage (1000 m × 250 m), on réduirait la concentration du seston dans le centre de la concession de 20-50%, limitant ainsi potentiellement la croissance. Les prédictions du modèle illustrent comment, en modifiant la géométrie de la concession (largeur:longueur), on peut obtenir un apport optimal de seston.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: February 1, 2001

More about this publication?
  • 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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