Gill net selectivity for Diplodus annularis and Mullus surmuletus in Greek waters
Published source details
Petrakis G. & Stergiou K.I. (1995) Gill net selectivity for Diplodus annularis and Mullus surmuletus in Greek waters. Fisheries Research, 21, 455-464
Published source details Petrakis G. & Stergiou K.I. (1995) Gill net selectivity for Diplodus annularis and Mullus surmuletus in Greek waters. Fisheries Research, 21, 455-464
This study is summarised as evidence for the following.
Use a larger mesh sizeAction Link
Use a larger mesh size
A replicated study in 1992-1993 of an area of seabed in the Aegean Sea, Greece (Petrakis & Stergiou 1995, same experimental set-up as Petrakis & Stergiou 1996) found that increasing the mesh size of a gillnet improved the size-selectivity of annular seabream Diplodus annularis and striped red mullet Mullus surmuletus compared to smaller mesh sizes. For both species, the average length of fish caught was greater for the largest mesh size of 23 mm (seabream: 119 mm, mullet: 165 mm) than a 21 mm mesh (seabream: 109 mm, mullet: 150 mm), a 19 mm mesh (seabream: 98 mm, mullet: 136 mm) and a 17 mm mesh (seabream: 88 mm, mullet: 122 mm). In addition, total catch decreased with increasing mesh size for seabream (23 mm: 121, 21 mm: 352, 19 mm: 123, 17 mm: 126 fish/1000 fathoms) and mullet (23 mm: 102, 21 mm: 73, 19 mm: 116, 17 mm: 352 fish/1000 fathoms). Fishing trials took place at 15 sites in the South Euboikos Gulf between August 1992 and April 1993. Nets were set two hours before sunrise and hauled two hours after sunrise at depths from 18–60 m. Gillnets with mesh sizes of 23 mm, 21 mm, 19 mm or 17 mm were switched monthly. Weight and length of captured fish were recorded.