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Theoretical study of the effect of round straps on the selectivity in a diamond mesh cod-end ArchiMer
Herrmann, B; Priour, Daniel; Krag, L.
FEMNET, a numerical tool based on the finite element method, was applied to estimate the shapes of various diamond-mesh cod-end designs during fishing. The only design differences rest in the use of round straps of different lengths, positions and numbers. The cod-end shape estimates were then entered in the selectivity simulation tool PRESEMO to simulate the selectivity processes of the various cod-end designs under the same varying fishing conditions. This enabled us to demonstrate how one or two round straps along the cod-end axis may change the selectivity of the cod-end compared with a reference cod-end, without round straps. We predict that in cod-end designs, which comply with the EU legislation, the 50% retention length (L50) may be reduced by up...
Tipo: Text Palavras-chave: Catch weight; FEMNET; PRESEMO; Round straps; Cod end selectivity.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1870.pdf
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Simulation-based study of the combined effect on cod-end size selection of turning meshes by 90 degrees and reducing the number of meshes in the circumference for round fish ArchiMer
Herrmann, Bent; Priour, Daniel; Krag, Ludvig A..
FEMNET, a numerical tool based on the finite element method, was used to estimate the shapes of four different designs of trawl cod-ends during fishing operations. Compared to a traditional diamond-mesh cod-end the design differences were the following: (i) the netting orientation was turned by 90 degrees (T90), (ii) the number of meshes in the circumference was reduced by 50% or (i) and (ii) were combined. The cod-end shape estimates were then entered into the simulation tool PRESEMO, to estimate their influence on the selectivity processes in the cod-end. This enabled us to predict how these design alterations - alone or combined - may act on the selectivity of each cod-end under identical fishing conditions. For instance, we predict that for a I 10 mm...
Tipo: Text Palavras-chave: FEMNET; PRESEMO; T90; Cod end selectivity.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2588.pdf
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