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Eighani, Morteza; Malta, Tiago Veiga; Melli, Valentina; O'Neill, Finbarr G.
Canadian journal of fisheries and aquatic sciences, 04/2024, Letnik: 81, Številka: 4Journal Article
In this study, we investigate whether replacing conventional seabed-contacting otter boards with semi-pelagic self-adjusting otter (SAO) boards, which have the ability to maintain a given height above the seabed, affects the catch efficiency of a demersal fish trawl. Experimental fishing trials, using the alternate haul method, were conducted in the Kattegat and Skagerrak with three otter board configurations using conventional seabed-contacting otter boards; the SAO set to maintain a target height over the seabed of 1 m; and the SAO set to maintain a target height of 5 m. Replacing conventional otter boards with SAO resulted in a loss of catch efficiency for haddock ( Melanogrammus aeglefinus), whiting ( Merlangius merlangus), and plaice ( Hippoglossoides platessoides), while no significant difference was found for cod ( Gadus morhua), common dab ( Limanda limanda), and lemon sole ( Microstomus kitt). When comparing the SAO-1 m and SAO-5 m, it was observed that SAO-5 m resulted in a loss of catch efficiency for haddock and plaice, a minimal reduction for cod, and no significant difference for whiting, common dab, and lemon sole.
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