inserting an excluder grid
to avoid catching Blackmouth catshark in the Mediterranean bottom trawl fishery.
Target species:
Norway lobster, greater forkbeard and all marketable species.
Area, Vessel
6 hauls took place during 2012 on board the FV “Angela Madre” (206 kW, 22.7 m, 67 GT) in the Tyrrhenian Sea.
Norway lobster, greater forkbeard and all marketable species.
Area, Vessel
6 hauls took place during 2012 on board the FV “Angela Madre” (206 kW, 22.7 m, 67 GT) in the Tyrrhenian Sea.
Gear type:
demersal trawl
Gear modification
An excluder grid of 90 mm bar spacing was inserted in front of the 50 mm diamond mesh codend of a standard commercial demersal trawl.
demersal trawl
Gear modification
An excluder grid of 90 mm bar spacing was inserted in front of the 50 mm diamond mesh codend of a standard commercial demersal trawl.
Results:
Bigger individuals of Blackmouth catshark escaped ahead of the grid. A large proportion of greater forkbeard were excluded by the grid and a small percentage of marketable Norway lobster were excluded by the grid. Reducing the grid bar spacing to 70 mm could provide a good trade-off between the reduction of Blackmouth catshark catches while keeping a high catch rate of greater forkbeard and Norway lobster.
Bigger individuals of Blackmouth catshark escaped ahead of the grid. A large proportion of greater forkbeard were excluded by the grid and a small percentage of marketable Norway lobster were excluded by the grid. Reducing the grid bar spacing to 70 mm could provide a good trade-off between the reduction of Blackmouth catshark catches while keeping a high catch rate of greater forkbeard and Norway lobster.
Further information:
a.sala@ismar.cnr.it
a.sala@ismar.cnr.it
Citation :
Sala, A.
, 2017.
inserting an excluder grid
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.