Acronym RAI-AP-6/2002
Category
Fisheries
Title Pilot action RAI/AP-06/2002 of trawl nets selectivity off Mallorca (Illes Balears) Programme National Programme
Instrument (FP6)
Contact Type (FP7)
Strand (Interreg)
NA
Theme (FP7)
Activity Area (FP6)
Regional Area (Interreg)
Action (COST)
NA
Specific Programme (FP7)
NA
Funding source National Coordinator Enric Massuti Coordinator email enric.massuti@ba.ieo.es
Coordinator institution
IEO - Spanish Institute of Oceanography (Spain)
Institutions involved
NA
Start year 2003 End year 2003 Funding (€) € 20,600 Website NA Summary Scientific monitoring report of a selectivity pilot action of trawl nets off Mallorca (Illes Balears). From 12 May to 6 June 2002, 32 bottom trawls have been developed, between 130 and 772 m depth, using 40 mm diamond and square mesh in the codend. The objective has been to compare commercial yields, selectivity parameters and discards with both mesh types for the main target species in this fishery off Mallorca (western Mediterranean). From 59 analysed species, only in one higher yield with diamond mesh has been found, whereas the 50% retention lengths with square mesh have been higher than ones with diamond mesh in all the species, excepting one. The discards percentage has been also smaller with square mesh, being the deepest range considered (600-800 m) in which the lowest proportion of commercial species in the discards has been estimated.
Goal:
To continue fishing with bottom trawls and 40 mm rhombic and square mesh codends in waters of the continental shelf and the slope of Mallorca, evaluating the selectivity of this type of gear and the profitability of regular exploitation with mesh codends square. The partial objectives that were proposed were: (1) To quantify the yields of some of the main target species of trawling in the area (e.g. red mullet, Eledone spp., hake, Norway lobster Nephrops norvegicus, white shrimp Parapenaeus longirostris, blue whiting Micromesistius poutassou and pink shrimp) using rhombic and square mesh flakes with a mesh size of 40 mm; (2) Calculate the selection ranges and the size at first capture for these species and these mesh types; (3) Estimate the biomass and the composition of the discards for both types of mesh.
Keywords
Red mullet;
Discard;
Lobster;
Fishing technology;
Cephalopod;
Octopus;
Fish;
Gear selectivity;
Environmental impact;
Shellfish;
Shrimp;
Crustacean;
Trawling;
Hake;
Marine Region
54
Balearic Island (GSA 5)
1
Marine Region Map
