reducing codend twine thickness
to reduce capture of undersized fish in the Italian demersal trawl fishery
Target species:
European hake, Whiting, Poor-cod, Red mullet, Common pandora and all marketable species
Area, Vessel
54 hauls took place during 2004 on board the RV “G. Dallaporta” (810 kW; 35.30 m; 285 GT) in the Central Adriatic.
European hake, Whiting, Poor-cod, Red mullet, Common pandora and all marketable species
Area, Vessel
54 hauls took place during 2004 on board the RV “G. Dallaporta” (810 kW; 35.30 m; 285 GT) in the Central Adriatic.
Gear type:
demersal trawl
Gear modification
The catches from two codends with the same mesh size (44 mm) but with different twine thicknesses are compared. The twine thicknesses are as follows (i) light PA: R3644tex, Ø 2.38 mm (ii) heavy PA: R5312tex, Ø 2.89 mm.
demersal trawl
Gear modification
The catches from two codends with the same mesh size (44 mm) but with different twine thicknesses are compared. The twine thicknesses are as follows (i) light PA: R3644tex, Ø 2.38 mm (ii) heavy PA: R5312tex, Ø 2.89 mm.
Results:
Using a codend made from thinner twine (2.38 mm) instead of one made from thicker twine (2.89 mm) improves the selectivity for all species. There is an improvement of 25% for European hake, 23% for whiting, 30% for poor cod, 20% for red mullet and 23% for common pandora.
Using a codend made from thinner twine (2.38 mm) instead of one made from thicker twine (2.89 mm) improves the selectivity for all species. There is an improvement of 25% for European hake, 23% for whiting, 30% for poor cod, 20% for red mullet and 23% for common pandora.
Further information:
a.sala@ismar.cnr.it
a.sala@ismar.cnr.it
Citation :
Sala, A.
, 2017.
reducing codend twine thickness
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.