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Title: Escape of hake (Merluccius merluccius), horse mackerel (Trachurus trachurus) and blue whiting (Micromesistiuspoutassou) in codends with shortened lastridge ropes
Authors: Cuende, Elsa; Sistiaga, Manu; Herrmann, Bent; Basterretxea, Mikel; Arregi, Luis
Citation: MEDITERRANEAN MARINE SCIENCE, 2022, 23, 917-934
Abstract: Diamond meshes in trawl codends have limited openness, which reduces escape opportunities for roundfish. Shortening the lastridge ropes (LR) attached to codend selvedges can increase the availability of open meshes resulting in higher chances of escape. However, this availability does not imply optimal mesh openness, nor does it guarantee use. We estimate the escape prob-ability of hake, horse mackerel and blue whiting through a 20\% shortened LR codend and a standard codend, and quantify the contribution of different mesh opening angles (OAs) to their size selectivity. The results confirm that high OAs increase escape opportunities for all species. However, shortened LR only improved size selectivity significantly for horse mackerel and blue whiting. This difference between species may be related to behavioural differences. The mesh openness achieved with 20\% short-ened LR was below that necessary to obtain optimal escape opportunities for these species. The study highlights the relevance of considering fish morphology and behaviour to optimally exploit size selectivity when designing shortened LR codends.
Keywords: lastridge ropes; mesh opening angle; escape opportunities; fish morphology; size selectivity; BETWEEN-HAUL VARIATION; MESH COD-ENDS; DIAMOND-MESH; SIZE-SELECTIVITY; CATCH SIZE; SQUARE; CIRCUMFERENCE; NUMBER; TRIALS; MODEL
Issue Date: 2022
Type: Article
DOI: 10.12681/mms.31041
ISSN: 1108-393X
Funder: Secretaria General de Pesca (MAPA)
Marine Research [1114]
Basque Research and Technology Alliance (BRTA)
Appears in Publication types:Artículos científicos

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