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Functional responses of haemocytes in the clam Tapes philippinarum from the Lagoon of Venice: fishing impact and seasonal variations

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Abstract:

In the last few years, the Manila clam (Tapes philippinarum) has been subjected to intense fishing effort in the Lagoon of Venice owing to their commercial importance. Because of the lack of data concerning fishing-induced immunomodulation in bivalves, the consequences of fishing impact on functional responses of clam haemocytes were investigated. Clams were seasonally collected from September 2000 to July 2001 from three sites: S. Angelo, a free-fishing area, and Chioggia, inside a licensed area for clam culture, in two zones characterised by fishing and non fishing, respectively. Haematocrit, phagocytosis, Neutral Red retention time, and lysozyme and superoxide dismutase activities were evaluated. No clear fishing effect was recorded, whereas a seasonal pattern of the cell para meters analysed was revealed. Alterations in functional responses of haemocytes seem to be more closely dependent on seasonal variations in both environmental parameters and physiological status of clams than on stress caused by fishing, and they may also be related to adaptation strategies of bivalves.

Ces dernières années, la palourde japonaise (Tapes philippinarum) a été, à cause de son importance commerciale, l'objet d'une pêche intense dans le lagon de Venise. Nous avons étudié les impacts de la pêche sur les réponses fonctionnelles des hémocytes des palourdes, car il y a peu d'information sur l'immunomodulation causée par la pêche chez les bivalves. Nous avons récolté des palourdes à toutes les saisons de septembre 2000 à juillet 2001 à trois endroits, une région de pêche libre à S. Angelo et une région de culture de moules réglementée par permis à Chioggia à deux sites, l'un avec pêche et l'autre sans. Nous avons évalué l'hématocrite, la phagocytose, la durée de rétention du rouge neutre, ainsi que les activités des lysozymes et de la superoxyde dismutase. Il n'y a pas d'effet net de la pêche; cependant, il existe un pattern saisonnier de variation des paramètres cellulaires étudiés. Les changements dans les réponses fonctionnelles des hémocytes semblent donc dépendre davantage des variations saisonnières des variables du milieu et de l'état physiologique des palourdes que du stress causé par la pêche; ils peuvent aussi être reliés aux stratégies adaptatives des bivalves.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2003

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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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