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

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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
Issue number6
Pages (from-to)464-473
Publication statusPublished - 2018

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