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Properties of abundance indices obtained from acoustic data collected by inshore herring gillnet boats

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Abstract:

Acoustic data collection during fishing activities can be used to obtain an abundance index. A simulation, calibrated against an experiment conducted during the Pictou, Nova Scotia, Canada, 1997 inshore herring fishery, is used to understand how survey design affects the properties of abundance indices derived from these data. Two fishing survey protocols and random and systematic transect surveys were simulated. During the complete fishing survey protocol, the simulated survey boat collected acoustic data before and after a management-imposed nightly boat limit was caught. In contrast, during the incomplete fishing survey protocol, data collection was terminated when the boat limit was caught. Properties of abundance indices derived from the fishing and transect surveys were examined over five levels of fish dispersion, two conditions of fish mobility, and in the presence and absence of concurrent fleet fishing. All indices were subject to change caused by changing fish dispersion, but only the incomplete fishing survey index was highly unsatisfactory. The complete fishing survey index is more susceptible to change than the transect indices but displays a lower sampling variation across conditions than the transect indices. We conclude that the complete fishing survey index is a viable alternative to the transect indices.

La récolte de données acoustiques pendant les activités de pêche commerciale peut servir à établir un indice d'abondance. Une simulation, calibrée d'après une expérience menée durant la saison 1997 de pêche côtière de Harengs à Pictou, Nouvelle-Écosse, Canada, a permis de comprendre comment le plan d'inventaire affecte les propriétés de l'indice d'abondance dérivé de ces données. Deux protocoles d'inventaire de pêche, le transect aléatoire et le transect systématique, ont été simulés. Dans le protocole complet d'inventaire de pêche, le bateau de l'inventaire simulé a récolté des données acoustiques avant et après que le quota de la nuit imposé par les gestionnaires au bateau ait été atteint. En revanche, dans le protocole incomplet, la récolte de données s'est arrêtée lorsque le quota du bateau a été atteint. Les propriétés des indices d'abondance obtenus à partir des inventaires de pêche et les transects ont été examinés sur cinq niveaux de dispersion et deux conditions de mobilité des poissons, ainsi qu'en présence et en absence de pêche par une flottille concurrente. Tous les indices étaient portés à changer d'après la dispersion des poissons, mais seul l'indice obtenu par l'inventaire incomplet était insatisfaisant. L'indice provenant de l'inventaire de pêche complet est plus sujet à changement que les indices obtenus des transects, mais il a une variation d'échantillonnage plus faible dans toute la gamme des conditions d'étude. L'indice obtenu à partir de l'inventaire de pêche complet est donc une alternative acceptable aux indices dérivés des transects.[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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