Abstract
Demersal shrimp fisheries, which are not very selective, generate significant discards and / or bycatch, generally composed of crustaceans, fish and molluscs of different size classes. As part of the implementation of the management plan for the deepwater shrimp Parapenaeus longirostris in Senegal, selectivity tests of the Nordmore device were conducted. Thus, three Nordmore grids characterized by different spacings between the bars (24, 28 and 30 mm) were tested on the experimental trawl in the Senegalese Economic Zone. Regardless of spacing, the Nordmore Grid completely removed large individuals from several species of commercial interest (John dory and Bearded brotula) or not (rays, sharks, etc.). Gamba shrimp loss analyzes indicate a significant difference (α <0.05) between the three spacer grids 24, 28 and 30 mm. Regardless of the type of grid, the amount of shrimp sorted per minute is larger for the experimental trawl; and this quantity increases with the spacing of the grid. The 30mm grid stands out with percentages of gamba shrimp losses ranging from 3 to 20% with an average of 8%; and a ratio of bycatch / gamba shrimp catch around 2.2 / 1, below the world average for this type of fishery (5/1).
Highlights
The ecosystem approach to fisheries has to prevent bycatch and discard for their impact on trophic web and habitat (Bellido et al 2001) as well as their economic impact on whole fisheries (Pascoe and Revill, 2004)
The sustainability of marine resource fisheries in Senegalese water is threatened by shrimp trawl
To Square mesh netting (Mbye, 2005), selectivity system used by the Direction of Marine Fisheries of Senegal (Senegalese acronym: DPM) is the Nordmøre grid already used in Nigeria (Ambrose and Lebo 2009), which is a mechanical system of sorting according to organisms size, removing individuals larger than the spacing between bars
Summary
The ecosystem approach to fisheries has to prevent bycatch and discard for their impact on trophic web and habitat (Bellido et al 2001) as well as their economic impact on whole fisheries (Pascoe and Revill, 2004). To Square mesh netting (Mbye, 2005), selectivity system used by the Direction of Marine Fisheries of Senegal (Senegalese acronym: DPM) is the Nordmøre grid already used in Nigeria (Ambrose and Lebo 2009), which is a mechanical system of sorting according to organisms size, removing individuals larger than the spacing between bars. To our knowledge this was the first time that the Nordmøre grid has been tested in Senegalese shrimp fishery. The aim of this work was to test and evaluate the efficiency of the Nordmøre grid (Silva et al 2012) in deep shrimp fishery of large prawns Parapenaeus longirostris in Senegal in the field in collaboration with the professional i.e. under commercial conditions (real condition), before to propose them this kind of gear
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