fitting square mesh panels
to improve bottom trawl selectivity on the Mediterranean continental slope
Target species:
red shrimp
Area, Vessel
10 pairs of hauls were carried out in the Balearic Islands bottom trawl fishery on the FV Nueva Joven Josefina (21 m, 150 HP) at depths between 600 – 700 m.
red shrimp
Area, Vessel
10 pairs of hauls were carried out in the Balearic Islands bottom trawl fishery on the FV Nueva Joven Josefina (21 m, 150 HP) at depths between 600 – 700 m.
Gear type:
demersal
Gear modification
The traditional four-panel bottom trawl net which is fished with semi-pelagic Thyborøn type 15VFS doors, was fitted with 10 square mesh panels. 4 in the upper section (58, 40, 17 and 9 m2) and 3 in each lateral section (16, 5 and 1 m2). The square mesh panels were made from 54 mm knotless Dyneema netting (1.2 mm twine thickness). The codend was made from 40 mm square mesh netting of 3 mm twine thickness.
demersal
Gear modification
The traditional four-panel bottom trawl net which is fished with semi-pelagic Thyborøn type 15VFS doors, was fitted with 10 square mesh panels. 4 in the upper section (58, 40, 17 and 9 m2) and 3 in each lateral section (16, 5 and 1 m2). The square mesh panels were made from 54 mm knotless Dyneema netting (1.2 mm twine thickness). The codend was made from 40 mm square mesh netting of 3 mm twine thickness.
Results:
There was no loss of target species in the trawl with the square mesh panels. Discards of non-commercial meso-pelagic crustaceans and fish reduced significantly and fuel consumption was reduced by up to 10%. It was concluded that the incorporation of square mesh netting panels could be a plausible additional measure to improve the selectivity of the 40 mm square mesh codend currently in force.
There was no loss of target species in the trawl with the square mesh panels. Discards of non-commercial meso-pelagic crustaceans and fish reduced significantly and fuel consumption was reduced by up to 10%. It was concluded that the incorporation of square mesh netting panels could be a plausible additional measure to improve the selectivity of the 40 mm square mesh codend currently in force.
Further information:
enric.massuti@ba.ieo.es; DISCATCH project (DG MARE Contract Nº MARE/2012/24 Lot 2) Final Report: http://en.med-ac.eu/progetti.php
enric.massuti@ba.ieo.es; DISCATCH project (DG MARE Contract Nº MARE/2012/24 Lot 2) Final Report: http://en.med-ac.eu/progetti.php
Citation :
Massuti, E.
, 2017.
fitting square mesh panels
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.