Istituto di Scienze Marine     
Fabi G., Sbrana M., Biagi F., Grati F., Leonori I., Sartor P. Trammel net and gill net selectivity for Lithognathus mormyrus (L., 1758), Diplodus annularis (L., 1758) and Mullus barbatus (L., 1758) in the Adriatic and Ligurian seas. In: Fisheries Research, vol. 54 (3) pp. 375 - 388. ELSEVIER SCIENCE BV, 2002.
The selectivity of a traditional trammel net, a monofilament trammel net and a gill net for Lithognathus mormyrus (striped sea-bream), Diplodus annularis (annular sea-bream) and Mullus barbatus (red mullet) was investigated in two coastal areas (central Adriatic sea and southern Ligurian sea). Three mesh sizes were tested for each set net: 45, 70 and 90 mm (stretched-mesh size). Selectivity was assessed by the indirect Sechin model based on the measurement of maximum body girth and head girth. The 45-mm mesh size was the most efficient for all the target species irrespective of net type. The catches obtained with the 90-mm meshes were always very low as were the catches of D. annularis and M. barbatus with the 70-mm mesh. Although most fishes of the three target species were caught by gilling and/or wedging, with all gears a number of individuals were also caught by virtue of the tangled and/or pocket effects. Their proportion, lowest and generally negligible in the gill net, higher in the monofilament and highest in the standard trammel net, caused a progressive widening of size-catch ranges, confirming the low selectivity of trammel nets. The 45-mm mesh appears to be the most suitable for the exploitation of the target species because it caught the highest number of specimens while it largely spared the juveniles.
DOI: 10.1016/S0165-7836(01)00270-3
Subject Lithognathus mormyrus
Diplodus annularis
Mullus barbatus
gill net
trammel net
Mediterranean sea

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