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Modelling axisymmetric cod-ends made of different mesh types ArchiMer
Priour, Daniel; Herrmann, B.; O'Neill, F. G..
Cod-ends are the rearmost part of trawl fishing gears. They collect the catch, and for many important species it is where fish selection takes place. Generally speaking they are axisymmetric, and their shape is influenced by the catch volume, the mesh shape, and the material characteristics. The shape of cod-ends is of importance as it determines mesh opening and consequently influences the selectivity of fish from the cod-end. Selectivity is the process whereby a gear retains large fish and releases small ones. In recent years, as many fish stocks have become more threatened, understanding the selectivity process has become more important. This paper presents a model of the deformation of an axisymmetric cod-end. The twine tension and the catch pressure...
Tipo: Text Palavras-chave: Cod-ends; Mesh shape; Trawl selectivity simulation; Bycatch reduction; Twine tensions; Catch force.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00006/11757/8497.pdf
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Modelling axisymmetric codends made of hexagonal mesh types ArchiMer
Priour, Daniel.
Codends are the rear parts of trawls, which collect the catch and where most of the selectivity process occurs. Selectivity is the process by which the large sh are retained while the small ones are released. The codends applied in many sheries often consist of only one type of mesh. Therefore it is reason- able to consider these codends as being axisymmetric. Their shapes depend mainly on the volume of catch, on the shape of meshes (diamond, square, hexagonal) and on the number of meshes along and around the codend. The shape of the codends is of prime importance in order to understand the se- lectivity process. This paper presents a model of deformation of codends made up of hexagonal meshes. Two types of hexagonal meshes have been investigated: the T0...
Tipo: Text Palavras-chave: Codends; Hexagonal meshes; Trawl selectivity; Simulation; Twine tensions; Catch force.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00215/32597/31061.pdf
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