using a 35mm Swedish grid and 120mm square mesh panels (smp)
to reduce capture of fish in a Nephrops trawl
Target species:
Nephrops
Area, Vessel
24 twin trawl hauls in the west of Scotland on board the Ocean Trust OB38 (375kW) and 34 twin trawl hauls in the North Sea on board the Fruitful Bough PD 109 (522kW)
Nephrops
Area, Vessel
24 twin trawl hauls in the west of Scotland on board the Ocean Trust OB38 (375kW) and 34 twin trawl hauls in the North Sea on board the Fruitful Bough PD 109 (522kW)
Gear type:
twin trawl
Gear modification
The catches of a standard nephrops trawl with (i) a 35 mm Swedish grid, (ii) a 120 mm SMP at 6-9 m from the codline and (iii) a 120 mm SMP at 12-15 m from the codline, were compared with those of a 40 mm codend.
twin trawl
Gear modification
The catches of a standard nephrops trawl with (i) a 35 mm Swedish grid, (ii) a 120 mm SMP at 6-9 m from the codline and (iii) a 120 mm SMP at 12-15 m from the codline, were compared with those of a 40 mm codend.
Results:
There were no loss of smaller Nephrops (< 40 mm carapace length) from the Swedish grid gear, but there were losses of between 10-25% in the length range 41-58 mm. The SMP gears retain all large prawns but lose between 12 and 30% of those below about 37 mm. The grid gear did not catch any large fish. The position of the SMPs did not influence catches of Nephrops, cod, haddock, or whiting.
There were no loss of smaller Nephrops (< 40 mm carapace length) from the Swedish grid gear, but there were losses of between 10-25% in the length range 41-58 mm. The SMP gears retain all large prawns but lose between 12 and 30% of those below about 37 mm. The grid gear did not catch any large fish. The position of the SMPs did not influence catches of Nephrops, cod, haddock, or whiting.
Further information:
Jim Drewery (j.drewery@marlab.ac.uk) Drewery J. et al., 2010. The selectivity of the Swedish grid and 120mm square mesh panels in the Scottish Nephrops trawl fishery. Fisheries Research, 106, 454 – 459.
Jim Drewery (j.drewery@marlab.ac.uk) Drewery J. et al., 2010. The selectivity of the Swedish grid and 120mm square mesh panels in the Scottish Nephrops trawl fishery. Fisheries Research, 106, 454 – 459.
Citation :
Drewery, J. et al.
, 2017.
using a 35mm Swedish grid and 120mm square mesh panels (smp)
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.