Bioeconomic impacts of two simple modifications to trawl nets in the NW Mediterranean

A bioeconomic model was built to assess the contribution of more selective trawl nets objectives European Multi-Annual Plan for demersal fisheries in Western Mediterranean (WM MAP). The biological submodel parameterized with age-structured population parameters five target stocks WM MAP (European hake, red mullet, deep-water rose shrimp, Nephrops and shrimp) a sixth stock combining remaining commercial by catch following biomass dynamics model. fleet composed three segments, according Vessel Length class (VL1218, VL1824, VL2440), practicing two métiers: coastal mixed fishery crustacean fishery. technological solutions analyzed are simple technical modifications otter bottom based on i) using panel meshes turned 90° (T90) extension net, ii) inserting grid from 40 mm square mesh (SM40) netting into net. Results show that, terms policy objectives, reduction values fishing mortality achieved these selectivity would be insufficient reach at maximum sustainable yield (Fmsy) prescribed 2025. However, results project substantial recovery hake mullet biomass. important help improve evolution economic indicators, resulting generally higher income, profits salaries short (2025) mid term (2030).