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Distribution of Atlantic salmon (Salmo salar) postsmolts of different origins in the Bay of Fundy and Gulf of Maine and evaluation of factors affecting migration, growth, and survival

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Abstract:

Atlantic salmon (Salmo salar) postsmolts surveyed by surface trawling in the Bay of Fundy and Gulf of Maine during 2001–2003 were aggregated in several areas in the Bay of Fundy and dispersed over a broader area in the Gulf of Maine. Postsmolt distribution reflected the major surface-current vectors and was independent of origin (wild vs. hatchery, inner vs. outer Bay of Fundy). Migration proceeded without disruption, and marked wild postsmolts from both the inner and outer Bay of Fundy were recaptured in the outer Bay of Fundy and the Gulf of Maine, where their distribution overlapped the commercial fishery for Atlantic herring (Clupea harengus). Marked postsmolts of wild origin were recaptured more frequently than those of hatchery origin but the overall density was low, and no schools of postsmolts were encountered that could offer protection from predators. Temperature and salinity in postsmolt habitat were favourable for growth and survival. Postsmolts were in excellent condition and had no bacterial or viral pathogens or salmon lice (Lepeophtheirus salmonis). They were feeding on pelagic prey (amphipods, euphausiids, and fish larvae) and the period of accelerated marine growth had started, indicating that environmental conditions and food supply were not limiting growth and survival.

Des post-saumoneaux du saumon atlantique (Salmo salar) inventoriés au chalutage de surface dans le baie de Fundy et le golfe du Maine en 2001–2003 étaient rassemblés dans quelques points de la baie de Fundy et dispersés sur une plus grande surface dans le golfe du Maine. La répartition des post-saumoneaux correspond aux principaux vecteurs de courants de surface et elle est indépendante de leur origine (nature ou pisciculture, régions interne ou externe de la baie de Fundy). La migration s'est faite sans problème et les post-saumoneaux sauvages marqués provenant des régions interne ou externe de la baie de Fundy ont été capturés dans la région externe de la baie de Fundy et dans le golfe du Maine où leur répartition chevauche celle de la pêche commerciale du hareng atlantique (Clupea harengus). Il y a plus de recaptures de post-saumoneaux marqués d'origine sauvage que de post-saumoneaux de pisciculture, mais leur densité est faible et il ne semble pas se former de bancs de post-saumoneaux pour offrir une protection contre les prédateurs. La température et la salinité dans les habitats de post-saumoneaux sont favorables à la croissance et la survie. Les post-saumoneaux sont en excellente condition et ne portent ni pathogènes bactériens et viraux, ni poux du saumon (Lepeophtheirus salmonis). Ils se nourrissent de proies pélagiques (amphipodes, euphausiacés et larves de poissons) et leur période de croissance accélérée en mer est commencée, ce qui indique que les conditions environnementales et l'approvisionnement alimentaire ne limitent pas la croissance ni la survie.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: June 1, 2005

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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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