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Experimental and theoretical study of red mullet (Mullus barbatus) selectivity in codends of Mediterranean bottom trawls ArchiMer
Sala, Antonello; Priour, Daniel; Herrmann, Bent.
The objective of this study was to investigate the effect on Mullus barbatus (red mullet) codend selectivity by increasing the codend mesh size or reducing the number of meshes in the codend circumference. This was performed through experimental sea trials and computer simulations. The sea trials were carried out in the Adriatic Sea using a polyamide codend in order to assess its selectivity, to record morphological (height, width and length) and population size structure parameters of red mullet (Mullus barbatus). The selectivity process in the codend was also simulated with an individual-based model (PRESEMO) and a finite element model (FEMNET) to calculate the codend shapes. By adjusting the behavioural description of red mullet in the simulation, the...
Tipo: Text Palavras-chave: Mediterranean Sea; Mullus barbatus; Red mullet; Codend shape simulation model; Trawl; Codend selectivity.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-2200.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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