using flexible sorting grids
to improve the selectivity of the Mediterranean bottom trawl fishery
Target species:
hake, Norway lobster, and red shrimp
Area, Vessel
21 hauls were carried out in the Balearic Islands multispecies bottom trawl fishery on board the FV Moralti Nou (22.05 m, 365 HP).
hake, Norway lobster, and red shrimp
Area, Vessel
21 hauls were carried out in the Balearic Islands multispecies bottom trawl fishery on board the FV Moralti Nou (22.05 m, 365 HP).
Gear type:
demersal
Gear modification
The catching performance of two flexible sorting grids, installed in the extension piece, were compared on a divided bottom trawl. The lower 25% of the grids did not have bars and led to a 40 mm diamond mesh codend. The upper 75% had bar spacing of either 15 mm (SG15) or 20 mm (SG20).
demersal
Gear modification
The catching performance of two flexible sorting grids, installed in the extension piece, were compared on a divided bottom trawl. The lower 25% of the grids did not have bars and led to a 40 mm diamond mesh codend. The upper 75% had bar spacing of either 15 mm (SG15) or 20 mm (SG20).
Results:
The 15 mm grid gear retained more smaller individuals of all species. The 20 mm grid gear was more selective and had fewer discards. It was concluded that using a 20 mm grid with a 40 mm square mesh codend could be a plausible additional measure to improve selectivity.
The 15 mm grid gear retained more smaller individuals of all species. The 20 mm grid gear was more selective and had fewer discards. It was concluded that using a 20 mm grid with a 40 mm square mesh codend could be a plausible additional measure to improve selectivity.
Further information:
INFORMATION enric.massuti@ba.ieo.es; Massutí E., et al.- 2009. Efficiency of flexible sorting grids to improve size selectivity of bottom trawl in the Balearic Islands (western Mediterranean), with comparison to a change in mesh cod-end geometry. Journal of Applied Ichthyology, 25: 153-161.
INFORMATION enric.massuti@ba.ieo.es; Massutí E., et al.- 2009. Efficiency of flexible sorting grids to improve size selectivity of bottom trawl in the Balearic Islands (western Mediterranean), with comparison to a change in mesh cod-end geometry. Journal of Applied Ichthyology, 25: 153-161.
Citation :
Massuti, E. et al.
, 2017.
using flexible sorting grids
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.