Escape of hake (Merluccius merluccius), horse mackerel (Trachurus trachurus) and blue whiting (Micromesistius poutassou) in codends with shortened lastridge ropes

 
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2022 (EL)

Escape of hake (Merluccius merluccius), horse mackerel (Trachurus trachurus) and blue whiting (Micromesistius poutassou) in codends with shortened lastridge ropes (EN)

BASTERRETXEA, MIKEL
SISTIAGA, MANU
HERRMANN, BENT
ARREGI, LUIS
CUENDE, ELSA

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 probability 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% shortened 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. (EN)

info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion

escape opportunities (EN)
size selectivity (EN)
mesh opening angle (EN)
lastridge ropes (EN)
fish morphology (EN)


Mediterranean Marine Science

Αγγλική γλώσσα

2022-11-09


Hellenic Centre for Marine Research (EN)

1791-6763
1108-393X
Mediterranean Marine Science; Τόμ. 23 Αρ. 4 (2022): VOL 23, No 4 (2022); 917-934 (EL)
Mediterranean Marine Science; Vol. 23 No. 4 (2022): VOL 23, No 4 (2022); 917-934 (EN)

Copyright (c) 2022 Mediterranean Marine Science (EN)



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