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| 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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| Rijnsdorp, A. D.; Bastardie, F.; Bolam, S. G.; Buhl-mortensen, L.; Eigaard, O. R.; Hamon, Katell; Hiddink, J. G.; Hintzen, N. T.; Ivanovic, A.; Kenny, A.; Laffargue, Pascal; Nielsen, J. R.; O'Neill, F. G.; Piet, G. J.; Polet, H.; Sala, A.; Smith, C.; Van Denderen, P. D.; Van Kooten, T.; Zengin, M.. |
| A framework to assess the impact of mobile fishing gear on the seabed and benthic ecosystem is presented. The framework that can be used at regional and local scales provides indicators for both trawling pressure and ecological impact. It builds on high-resolution maps of trawling intensity and considers the physical effects of trawl gears on the seabed, on marine taxa, and on the functioning of the benthic ecosystem. Within the framework, a reductionist approach is applied that breaks down a fishing gear into its components, and a number of biological traits are chosen to determine either the vulnerability of the benthos to the impact of that gear component, or to provide a proxy for their ecological role. The approach considers gear elements, such as... |
| Tipo: Text |
Palavras-chave: Benthos; Biological traits; Good environmental status; Indicators; Method; Mobile gear; Physical impacts. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00310/42136/44229.pdf |
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