Data/hora: 09/06/2024 02:27:32

Provedor de dados: | Institutional Archive of Ifreme (ArchiMer)
País: | France
Título: | Estimating end effects in trawl catches
Autores: | Battaglia, Andre; Trenkel, Verena; Rochet, Marie-joelle.
Data: | 2006-06
Ano: | 2006
Palavras-chave: | Trawl survey; Bias; Abundance index.
Resumo: | The end effect in trawl catches is defined as the proportion of the fish catch taken during shooting and hauling of the net, a period excluded from that nominally referred to as haul duration. If important, this effect will lead to biased abundance estimates, because the swept area will be underestimated. An experimental survey was carried out to compare catch numbers obtained in standard research 30-min hauls with those from 0-min hauls, the latter referring to the trawl being hauled as soon as the trawl geometry stabilized on the seabed. Average catch ratios (0-min/30-min hauls) ranged from 0.05 (s.d. 0.06) for sole to 0.34 (s.d. 0.64) for hake, indicating that the end effect might be more important and more variable for highly mobile species. As a consequence, the bias in abundance indices derived from swept area estimates that ignore end effects will be species-dependent. (c) 2006 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All rights reserved.
Tipo: | Text
Idioma: | Inglês

Identificador:

https://archimer.ifremer.fr/doc/2006/publication-1686.pdf

DOI:10.1016/j.icesjms.2006.03.002

https://archimer.ifremer.fr/doc/00000/1686/

Editor: | Elsevier
Formato: | application/pdf
Fonte: | ICES Journal of Marine Science (1054-3139) (Elsevier), 2006-06 , Vol. 63 , N. 5 , P. 956-959

Fonte:

2006 International Council for the Exploration of the Sea Published by Elsevier Ltd

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