using a large square mesh panel (90 mm mesh size) in the last tapered section of a trawl
to improve trawl selectivity
Target species:
Whiting >32cm, haddock >34cm, monkfish, squid, cuttlefish and red mullet
Area, Vessel
39 pairs of alternate hauls were carried out from December 2016 to February 2017 on board 20-24 m bottom trawlers fishing in the Western Channel.
Whiting >32cm, haddock >34cm, monkfish, squid, cuttlefish and red mullet
Area, Vessel
39 pairs of alternate hauls were carried out from December 2016 to February 2017 on board 20-24 m bottom trawlers fishing in the Western Channel.
Gear type:
demersal
Gear modification
A four panel trawl with an 80 mm codend was fitted with a large 90 mm square mesh panel in its last tapered section.
demersal
Gear modification
A four panel trawl with an 80 mm codend was fitted with a large 90 mm square mesh panel in its last tapered section.
Results:
The device has been effective in selecting whiting above the target size (32 cm), although tests ashore, of passing fish through square meshes, indicate that the 90 mm mesh size may be slightly too large. Overall, the large vertical opening of the four-sided trawl at the level of the device limited the escapement, leading to differences in catch between the two gears. Nevertheless, pelagic fish such as mackerel which are capable of swimming rapidly in the upper part of the baitings, seem to have escaped better. Finally, no commercial losses were observed.
The device has been effective in selecting whiting above the target size (32 cm), although tests ashore, of passing fish through square meshes, indicate that the 90 mm mesh size may be slightly too large. Overall, the large vertical opening of the four-sided trawl at the level of the device limited the escapement, leading to differences in catch between the two gears. Nevertheless, pelagic fish such as mackerel which are capable of swimming rapidly in the upper part of the baitings, seem to have escaped better. Finally, no commercial losses were observed.
Further information:
OP COBRENORD 02 96 70 81 04, contact@cobrenord.com http://www.cobrenord.com/2018/07/17/parution-du-rapport-final-du-projet-rejemcelec/
OP COBRENORD 02 96 70 81 04, contact@cobrenord.com http://www.cobrenord.com/2018/07/17/parution-du-rapport-final-du-projet-rejemcelec/
Citation :
, 2017.
using a large square mesh panel (90 mm mesh size) in the last tapered section of a trawl
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.