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Turkish Journal of Fisheries and Aquatic Sciences 2008, Vol 8, Num, 2     (Pages: 373-376)

The Effects of Netting Twine on Discard Rates of Commercial Red Mullet Gillnets in Izmir Bay

İlker Aydın 1 ,Gökhan Gökçe 2 ,Cengiz Metin 3

1 Ege University, Faculty of Fisheries, 35100 Bornova, İzmir, Turkey
2 Çukurova University, Faculty of Fisheries, 01330 Balcalı, Adana, Turkey
3 Ege University, Underwater Research and Application Centre, 35440 Urla, İzmir, Turkey
Viewed : 3840 - Downloaded : 2440 In this study, discarded rates of the commercial red mullet (Mullus barbatus) gillnets made from different netting twine, monofilament and multifilament were presented. The nets were set near the shore which contains sea grasses (Posidonia oceanica) in İzmir Bay. These areas are sensitive habitats. During the fishing trials, totally 32 fish species have been caught, 21 of which were non-marketable. The rates of these non-marketable species are 77.8% and 22.8% in number for monofilament and multifilament gillnets, respectively. Serranidae and Labridae families were dominant in catch composition. The CPUE of the monofilament and multifilament gillnets for weight were calculated as 129.6±5.1 and 36.9±1.3 respectively. As a result, monofilament gillnets caught more non-marketable species than multifilament gillnets (P<0.05; z=0.007). Because of the high rate of discarded species, it is not advisable to use monofilament gillnets near the shore, which contains sensitive habitats. Keywords : Monofilament, Multifilament, Serranidae, Labridae, Sensitive habitats