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The impact of the  gillnet fishery on Merluccius merluccius (European hake) was investigated in the northern Tyrrhenian Sea, western Mediterranean. Four mesh sizes were tested: 53, 62.5,  70 and 82 mm. Horse mackerel (Trachurus trachurus), hake and tub gurnard (Chelidonichthys lucerna) dominated the catches, from a minimum of 89% (82 mm mesh) to a maximum  of 97.8% (70 mm) of the biomass caught. Efficiency of the four meshes was not  significantly different with respect to the total hake catches. Selectivity on M. merluccius was assessed by Sechin and SELECT methods.  Tangling was an important catch modality for hake, as evidenced by the results  of the Sechin model which described only the first mode of the size  distributions corresponding to the entangled specimens. SELECT showed that the  bi-modal function gave the best adjustment to the length-frequency  distributions; the modal catch sizes were 33, 39.2, 43.6 and 51 cm total length  respectively for the 53, 62.5, 70 and 82 mm mesh sizes. Taking into account the  size of first maturity for females (35.1 cm TL), 62.5 mm is the most adequate  mesh for exploiting hake as it gives some protection to both immature specimens  and large females

scientia marina

Comparison of the catches of European hake (Merluccius merluccius, L. 1758) taken with experimental gillnets of different mesh sizes in the northern Tyrrhenian Sea (western Mediterranean)