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Turkish Journal of Fisheries and Aquatic Sciences
Turkish Journal of Fisheries and Aquatic Sciences 9: 133-136 (2009)
[DOI: 10.4194/trjfas.2009.0202] | | | | Bycatch Reduction in Trammel Net Fishery for Prawn (Melicertus kerathurus) by Using Guarding Net in İzmir Bay on Aegean Coast of Turkey |
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| Cengiz Metin1,*, Gökhan Gökçe2, İlker Aydın3, İsa Bayramiç3 |
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| 1Ege University, Underwater Research and Application Centre, 35440, İzmir, Turkey.2Çukurova University, Faculty of Fisheries, Department of Fishing Technology, 01330, Balcalı, Adana, Turkey.3Ege University, Faculty of Fisheries, Department of Fishing Technology, 35100, Bornova, İzmir, Turkey. |
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* Corresponding Author: Tel.: +90 232 7521163/170; Fax: +90 232 3747450;
E-mail: cengiz.metin@ege.edu.tr |
Received 10 October 2008
Accepted 07 April 2009 |
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Abstract:
In this study, by-catch reduction in trammel nets used for prawn fishery in İzmir Bay was studied between May and October 2003. In shrimp trammel net fishery catching of discard species is an important problem due to a series of reasons such as disentangle species causes extra work for fishermen and decreases the labour life of nets. A Guarding net was attached to lead line of traditional shrimp trammel net as a modification to minimize this problem. Control Nets (CNet), originated from traditional commercial nets, and were compared against two groups of Experimental nets (Exp1 and Exp2) in two periods. In the first period of the study Exp1 net group caught 36.46% fewer shrimp (Melicertus kerathurus) in comparison to CNet. In addition to this, 35.62% crab (Goneplax rhomboides), 40.71% mantis shrimp (Squila mantis) and 44.77% purple dye murex (Bolinus brandaris) were caught fewer than those in CNet net group. In the second period of the study Exp2 net group were put into the trial. In this period, Exp1 net group compared with CNet net group caught less shrimp (8.09%), crab (66.15%), mantis shrimp (26.79%) and purple dye murex (32.25%). Exp2 net group caught fewer shrimp (0.99%), crab (50.63%), mantis shrimp (17.33%) and purple dye murex (25.92%) than CNet net group. This study indicates that the net modification was capable of reducing bycatch. Raising of trammel net above the lead line from muddy ground prevent discarding of demersal species from net. Therefore the height of guarding net is an important criterion for bycatch reduction. |
| Keywords: By-catch reduction, trammel net, prawn, Aegean Sea. |
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| More: Full Text (PDF - 265 KB) |
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