Estimating natural and fishing mortality and tag reporting rate of southern rock lobster (Jasus edwardsii) from a multiyear tagging model

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Abstract:

Fishing and natural mortality rates and tag reporting rate for rock lobsters (Jasus edwardsii) in northwest Tasmania, Australia, were estimated using multiyear tagging models. These estimates are necessary for assessment of the resource. Several models were examined that had either two or three tagging events each year, and either combined sexes or kept sexes separate. The model that best described the dynamics of the fishery utilized three tagging events within a year. The year was divided into discrete periods and, within each year, fishing effort and duration of period were used to apportion fishing and natural mortalities, respectively, to the periods. The separation of fishing mortalities by sex was not found to improve the models. Although high (1.0–1.2·year–1), the instantaneous fishing mortality estimates were comparable to estimates obtained from other methods and the relative standard errors were low. Reporting rate estimates were also precise and indicated a lack of participation by the fishing industry. Estimates of natural mortality were low (0.00–0.02·year–1) but imprecise.

Les taux de mortalité naturelle et de mortalité due à la pêche ainsi que les taux de signalisation des étiquettes chez la langouste Jasus edwardsii dans le nord-ouest de la Tasmanie en Australie ont pu être estimés à l'aide de modèles pluri-annuels de marquage. Ces estimations sont nécessaires pour l'évaluation de la ressource. Plusieurs modèles ont été examinés qui comportaient deux ou trois sessions de marquage chaque année et qui combinaient ou séparaient les sexes. Le modèle qui décrit le mieux la dynamique de cette pêche commerciale utilise trois sessions de marquage dans l'année. L'année est divisée en périodes distinctes et, au cours de chaque année, l'intensité de la pêche et la durée de la période servent à répartir la mortalité naturelle et la mortalité due à la pêche dans les périodes. La répartition des mortalités dues à la pêche entre les sexes n'améliore pas les modèles. Bien qu'élevées (1,0–1,2·année–1), les estimations des taux instantanés de mortalité due à la pêche se comparent aux taux obtenus par d'autres méthodes et les erreurs types relatives sont peu importantes. Les taux de signalisation sont aussi précis et démontrent un manque de coopération de la part de l'industrie de la pêche. Les estimations de la mortalité naturelle sont basses (0,00–0,002·année–1), mais imprécises.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: December 1, 2001

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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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