Abstract
The present study is the first concerning gill net selectivity in Greek marine waters. Selectivity estimates were made for Diplodus annularis and Mullus surmuletus. Sampling took place at 15 stations in the South Euboikos Gulf in 1992 and 1993 with a chartered commercial small-scale fishing vessel. Samples were collected with gill nets of mesh sizes (bar length) of 17, 19, 21 and 23 mm. Individual selection factors for M. surmuletus and D. annularis ranged between 4.83 and 7.42 whereas the optimum selection lengths increased from 12.2 to 16.5 cm for M. surmuletus and from 8.8 to 11.9 cm for D. annularis, for the 17 mm and 23 mm nets, respectively. Comparisons between the estimated optimum lengths and the minimum legal landing sizes and between the length frequency distributions of the catches of D. annularis and M. surmuletus in gill nets and those in trawl nets are also presented.
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