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The catchability of large American lobsters (Homarus americanus) from diving and trapping studies off Grand Manan Island, Canadian Maritimes

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Abstract:

Catchability (q) in traps was estimated for American lobsters (Homarus americanus) in Flagg Cove, off Grand Manan Island (New Brunswick, Canada), where large females (>100 mm carapace length (CL)) aggregate in late summer and early fall. In 2001 and 2002, diver surveys were used to estimate lobster density, and traps were then deployed to obtain catch rates. Bayesian generalized linear models were fit to the densities of different size groups (81–100, 101–130, 131–160, and >160 mm CL) of ovigerous females, non-ovigerous females, and males. Catchability was strongly affected by year. Differences in q due to sex and size for ovigerous females, non-ovigerous females, and males were apparent but were not consistent between years. Size was not an important factor for the catchability of lobsters between 81 and 160 mm CL. In comparison with lobsters of a similar size in other areas, Flagg Cove lobsters in the size range of 81–100 mm CL were less catchable. We hypothesize that this resulted from the high densities and larger sizes of lobsters in Flagg Cove, which likely lead to increased agonistic interactions and reduced entry of lobsters into traps.

Nous avons estimé la capturabilité (q) des homards américains (Homarus americanus) dans les casiers à Flagg Cove, au large de l'île du Grand Manan (Nouveau-Brunswick, Canada), où les femelles de grande taille (>100 mm de longueur de carapace, CL) se rassemblent à la fin de l'été et au début de l'automne. En 2001 et 2002, des inventaires par des plongeurs ont permis d'estimer la densité des homards; des casiers ont ensuite été placés pour obtenir les taux de capture. Nous avons ajusté des modèles linéaires généralisés bayésiens aux densités des différents groupes de taille (81–100, 101–130, 131–160 et >160 mm de CL) de femelles ovigères et non ovigères et de mâles. La capturabilité est fortement affectée par l'année. Des différences de q reliées au sexe et à la taille sont évidentes ches les femelles ovigères, les femelles non ovigères, et les mâles, mais elles sont variables d'une année à l'autre. La taille n'est pas un facteur important de capturabilité des homards dans l'intervalle de 81 et 160 mm de CL. Les homards de Flagg Cove dans l'intervalle de tailles de 81–160 mm ont une capturabilité plus faible que les animaux de taille semblable dans d'autres régions. Nous croyons que cette situation résulte des fortes densités et des tailles plus importantes des homards à Flagg Cove, ce qui entraîne vraisemblablement une augmentation des interactions agonistes et réduit l'entrée des homards dans les casiers.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2006

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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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