Using 40mm square mesh codend
to reduce capture of undersized fish in the Italian demersal trawl fishery.
Target species:
Mediterranean scaldfish, broad-tail shortfin squid, European hake, red mullet, Norway lobster, common pandora, deepwater rose shrimp, Mediterranean horse mackerel, poor-cod and all marketable species.
Area, Vessel
47 hauls took place during 2004 on board the RV Andrea (29.15 m; 285 GT) in the Central Adriatic Sea.
Mediterranean scaldfish, broad-tail shortfin squid, European hake, red mullet, Norway lobster, common pandora, deepwater rose shrimp, Mediterranean horse mackerel, poor-cod and all marketable species.
Area, Vessel
47 hauls took place during 2004 on board the RV Andrea (29.15 m; 285 GT) in the Central Adriatic Sea.
Gear type:
demersal trawl
Gear modification
The catch from a 40 mm diamond mesh codend is compared with that of a 40 mm square mesh codend.
demersal trawl
Gear modification
The catch from a 40 mm diamond mesh codend is compared with that of a 40 mm square mesh codend.
Results:
The 40 mm square mesh codend was more selective then 40 mm diamond mesh for all species except for the flatfish, Mediterranean scaldfish. The improvement was 76% for broad-tail shortfin squid, 70% for European hake, 36% for red mullet, 23% for Norway lobster, 27% for common pandora, 26% for deepwater rose shrimp, 36% for Mediterranean horse mackerel and 36% for poor-cod. For Mediterranean scaldfish the square mesh codend was 8% less selective than the 40 mm diamond mesh codend.
The 40 mm square mesh codend was more selective then 40 mm diamond mesh for all species except for the flatfish, Mediterranean scaldfish. The improvement was 76% for broad-tail shortfin squid, 70% for European hake, 36% for red mullet, 23% for Norway lobster, 27% for common pandora, 26% for deepwater rose shrimp, 36% for Mediterranean horse mackerel and 36% for poor-cod. For Mediterranean scaldfish the square mesh codend was 8% less selective than the 40 mm diamond mesh codend.
Further information:
a.sala@ismar.cnr.it
a.sala@ismar.cnr.it
Citation :
Sala, A.
, 2017.
Using 40mm square mesh codend
. In O’Neill, F.G. and Mutch, K. (Eds): Selectivity in Trawl Fishing Gears. Scottish Marine and Freshwater Science Vol 8 No 1.