an 80 mm square mesh panel in the extension and last tapered section with a 4-panel codend
to improve trawl selectivity
Target species:
Whiting >32cm, haddock >34cm, monkfish, squid, cuttlefish and red mullet
Area, Vessel
46 pairs of alternate hauls were carried out from January to March 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
46 pairs of alternate hauls were carried out from January to March 2017 on board 20-24 m bottom trawlers fishing in the Western Channel.
Gear type:
demersal
Gear modification
A trawl with a 2-panel 100 mm mesh size codend and extension was compared with a test trawl that had a 4-panel 100 mm codend and extension and an 80 mm smp in the last tapered section and extension.
demersal
Gear modification
A trawl with a 2-panel 100 mm mesh size codend and extension was compared with a test trawl that had a 4-panel 100 mm codend and extension and an 80 mm smp in the last tapered section and extension.
Results:
There are decreases of unwanted catches of haddock, mackerel and horse mackerel. There are also reductions of catches of marketable whiting and red mullet which are estimated to represent a 17% decrease in whiting turnover and 6% decrease of overall turnover. It was thought that the 4-panel codend and extension would increase the vertical opening of the extension and limit squid contact with the smp. Unfortunately, it was not possible to confirm this hypothesis with the video footage.
There are decreases of unwanted catches of haddock, mackerel and horse mackerel. There are also reductions of catches of marketable whiting and red mullet which are estimated to represent a 17% decrease in whiting turnover and 6% decrease of overall turnover. It was thought that the 4-panel codend and extension would increase the vertical opening of the extension and limit squid contact with the smp. Unfortunately, it was not possible to confirm this hypothesis with the video footage.
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.
an 80 mm square mesh panel in the extension and last tapered section with a 4-panel codend
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.