Acronym NA
Category
Fisheries
Title Studio dell'influenza del diametro del monofilo sull'efficienza e sulla selettività delle reti ad imbrocco da sogliole - Study of the influence of monofilament diameter on the efficiency and selectivity of sole gill nets Programme Nat. Programme (supported by ESIF)
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-European Coordinator Fabio Grati Coordinator email fabio.grati@cnr.it
Coordinator institution
CNR - National Research Council (Italy)
Institutions involved
NA
Start year 2010 End year 2011 Funding (€) € 29,225 Website NA Summary Experimental fishing trials were carried out on an Italian commercial vessel analysing the total catches of the gill nets used to catch common sole (Solea solea). A comparison was made of five gill nets differing only by the nominal monofilament diameter: 0.18, 0.20, 0.22, 0.25, and 0.30 mm. The nominal mesh size (stretched) was 72 mm. All the species caught were identified, counted for number of specimens and categorized as commercial, discard of commercial species, and discard of non-commercial species. Each specimen of S. solea and tub gurnard Chelidonichthys lucerna was measured for the total length. Method of capture was assessed for each specimen of common sole. A total of 47 taxa were caught. The mean number of species caught with 0.30 mm monofilament was significantly lower than those obtained with the three thinnest diameters. Total abundance, abundance of commercial and discard of non-commercial species significantly decreased with the increase of monofilament diameter. The abundance of S. solea and C. lucerna were statistically similar among diameters. No statistical differences were observed for the demography of common sole and tub gurnard caught with the different monofilament diameters. The analysis of the methods of capture for the common sole showed that in all diameters the main ways of retention were mouth clapped and gilled, and the percentage of individuals retained by the mouth decreased with the increase of diameters, while an opposite trend was observed for the soles caught by gilled. Monofilament thickness had a substantial effect upon the fishing power of the gill nets.
Goal:
Assess the effect of monofilament thickness upon the efficiency and species selection of gill nets used to catch common sole in the Adriatic.
Keywords
Gillnets;
Gear selectivity;
Fishing technology;
Sole;
Flatfish;
Fish;
Marine Region
74
Northern Adriatic (GSA 17)
1
Marine Region Map
