The efficiency of sieve-panels for bycatch separation in Nephrops trawls

Juan Santos*, Bent Herrmann, Bernd Mieske, Ludvig Ahm Krag, Stefanie Haase, Daniel Stepputtis

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This study investigated the efficiency of a sieve-panel concept, intended to separate bycatch species from Nephrops (Norway lobster) in a trawl gear via mechanical and behavioural means. Four different designs of varying panel mesh size or inclination were tested in experimental fishing. For each design, the length-dependent sieving efficiency, defined as the fraction of Nephrops
or fish passing through the panel to the lower codend, was estimated. The sieving efficiency for Nephrops increased from ~17% to ~71% as mesh size increased, and decreased with increasing carapace length, but did so less as panel inclination and mesh size increased. The sieving efficiency for
roundfish was low, as intended, while the efficiency for flatfish decreased with fish size. Although results are promising, the sieving efficiency for the largest, most valuable Nephrops remained too low. Therefore, further improvements are necessary before the concept is acceptable to the commercial fishing fleet
Original languageEnglish
JournalFisheries Management and Ecology
Volume25
Issue number6
Pages (from-to)464-473
ISSN0969-997X
DOIs
Publication statusPublished - 2018

Cite this

Santos, Juan ; Herrmann, Bent ; Mieske, Bernd ; Krag, Ludvig Ahm ; Haase, Stefanie ; Stepputtis, Daniel. / The efficiency of sieve-panels for bycatch separation in Nephrops trawls. In: Fisheries Management and Ecology. 2018 ; Vol. 25, No. 6. pp. 464-473.
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title = "The efficiency of sieve-panels for bycatch separation in Nephrops trawls",
abstract = "This study investigated the efficiency of a sieve-panel concept, intended to separate bycatch species from Nephrops (Norway lobster) in a trawl gear via mechanical and behavioural means. Four different designs of varying panel mesh size or inclination were tested in experimental fishing. For each design, the length-dependent sieving efficiency, defined as the fraction of Nephrops or fish passing through the panel to the lower codend, was estimated. The sieving efficiency for Nephrops increased from ~17{\%} to ~71{\%} as mesh size increased, and decreased with increasing carapace length, but did so less as panel inclination and mesh size increased. The sieving efficiency for roundfish was low, as intended, while the efficiency for flatfish decreased with fish size. Although results are promising, the sieving efficiency for the largest, most valuable Nephrops remained too low. Therefore, further improvements are necessary before the concept is acceptable to the commercial fishing fleet",
author = "Juan Santos and Bent Herrmann and Bernd Mieske and Krag, {Ludvig Ahm} and Stefanie Haase and Daniel Stepputtis",
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Santos, J, Herrmann, B, Mieske, B, Krag, LA, Haase, S & Stepputtis, D 2018, 'The efficiency of sieve-panels for bycatch separation in Nephrops trawls', Fisheries Management and Ecology, vol. 25, no. 6, pp. 464-473. https://doi.org/10.1111/fme.12323

The efficiency of sieve-panels for bycatch separation in Nephrops trawls. / Santos, Juan; Herrmann, Bent; Mieske, Bernd; Krag, Ludvig Ahm; Haase, Stefanie; Stepputtis, Daniel.

In: Fisheries Management and Ecology, Vol. 25, No. 6, 2018, p. 464-473.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Santos, Juan

AU - Herrmann, Bent

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AU - Krag, Ludvig Ahm

AU - Haase, Stefanie

AU - Stepputtis, Daniel

PY - 2018

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