Abstract

Deniz kaynaklarının sürdürülebilirliği için balıkçılık yönetimi son derece önemlidir. Bu nedenle balıkçılık alanları sürekli olarak izlenmelidir. Bu çalışmada kullanılan veriler İskenderun Körfezi'nde (Kuzeydoğu Levant Denizi) avlanan bir ticari trol teknesi ile toplanmıştır. Balıkçılığa bağlı veriler, 2012-2013 balıkçılık sezonunda tekne mürettebat yardımı ile kaydedilmiştir. 26 saat süren 33 trol çekimi 44 mm rombik ağ gözü boyutuna sahip torba kullanılarak gerçekleştirilmiştir. Trol çekim hızı 2,5 ila 3,0 knot arasında değişmiş ve en fazla 70 dakika sürmüştür. İskenderun Körfezi’nde 39-69 m derinlik konturu incelenmiştir. 32 tür ıskarta olarak değerlendirilirken, 35 tür ticari av içinde yer almıştır. Buna karşın, toplam av CPUEW (birim zamanda elde edilen biyokütle) açısından değerlendirildiğinde %67,2’sinin ticari ava %32,8'inin ise ıskarta ait olduğu saptanmıştır. 

Project Number

27457

THE COMMERCIAL AND DISCARD CATCH RATES OF THE TRAWL FISHERY IN THE İSKENDERUN BAY (NORTHEASTERN LEVANTINE SEA)

Abstract

The management of fishery is significant due to the sustainability of marine resources. Therefore, the fishing areas should be constantly monitored. In this study, the fishery data were collected from the Iskenderun Bay (Northeastern Levantine Sea) with a rented commercial trawl vessel. The fishery-dependent data was recorded during the 2012-2013 fishing season with the help of the crew. 33 tows were achieved using a trawl net (codend diamond mesh size of 44 mm) for 26 hours. Each tow was limited with 70 min and the towing speed varied between 2.5 to 3.0 knots. The depth contour ranged from 39 to 69 m. While 32 species were evaluated as discard, 35 species were included in the landed catch. The total catch consisted of 67.2% the landed and 32.8% of the discarded fish in terms of CPUEW (catch per unit effort by weight). 

Keywords

• Discard
• Landed Catch
• Turkey
• Levantine Sea
• Fish Species

Supporting Institution

Scientific Research Projects Coordination Unit of Istanbul University

Project Number

27457

Thanks

The author thanks Nur Bikem KESİCİ for contributions on an earlier version of this manuscript.

References

1. 1. Bayhan, K.Y., Çiçek, E., Ünlüer, T. & Akkaya, M. 2006. Guneydoğu Marmara’da Algarna ile Karides Avcılığında Av Kompozisyonu ve Hedef Dışı Av. Ege Universitesi Su Urunleri Fakultesi Yayınları, 23(3-4): 277-283.
2. 2. Bordalo-Machado, P. 2006. Fishing effort analysis and its potential to evaluate stock size. Reviews in Fisheries Science, 14: 369-393.
3. 3. Demirci, A. 2003. Non Target Demersal Species Inhabiting Iskenderun Bay and Their Biomass Estimation. Msc. Thesis, Mustafa Kemal Üniversitesi, Antakya, Turkey, 40 pp.
4. 4. D’onghia, G., Carlucci, R., Maiorano, P. & Panza, M. 2003. Discards from deep-water bottom trawling in the EasternCentral Mediterranean Sea and effects of mesh size changes. Journal of Northwestern Atlantic Fisheries Science, 31: 245-261.
5. 5. Gökçe, G. & Metin, C. 2006. Balıkçılıkta hedef dışı Av sorunu uzerine bir inceleme. Ege Universitesi Su Urunleri Dergisi, 23(3-4): 457-462.
6. 6. Gökçe, G., Saygu, İ. & Eryaşar, A.R. 2016. Catch composition of trawl fisheries in Mersin Bay with emphasis on catch biodiversity. Turkish Journal of Zoology, 40: 522-533. https://doi:10.3906/zoo-1505-35
7. 7. Gücü, A.C., Bingel, F., Avşar, D. & Uysal, N. 1994. Distribution and Occurrence of Red Sea Fish at The Turkish Mediterranean Coast-Northern Cilician Basin. Acta Adriatica, 34(1/2): 103-113.
8. 8. Gücü, A.C., Ok, M. & Sakınan, S. 2010. Sub Regional Technical Meeting on the Lesepsian Migration and Its Impact on Eastern Mediterranean Fishery, Past and Present of Fish Fauna in the NE Levant Sea and Factor Facilitating the Colonization by Lesepsian Fishes. FAO Eastmed Working Document, 7-9 December 2010 Nicosia, 88-108.

9. 9. Gücü, A.C. 2012. Impact of depth and season on the demersal trawl Discard. Turkish Journal of Fisheries and Aquatic Sciences, 12: 817-830.
10. 10. Karpuz, E. & Sakalli, A., 2019. Investigation of the Effect of Climate Change Affecting Sea Surface Temperature Mean between 1999 and 2012 on the Maritime Trade in the Gulf of Iskenderun. Natural and Engineering Sciences, 4(1): 55-64.
11. 11. Kınacıgil, T.H., Çıra, E. & İlkyaz, T.A. 1999a. Balıkçılıkta Hedeflenmeden Avlanan Turler Sorunu. Ege Universitesi Su Urunleri Dergisi, 16(3-4): 437-444.
12. 12. Kınacıgil, H.T., Çıra, E. & İlkyaz, A.T. 1999b. A Preliminary Study on the Shrimp Trawling Bycatch In Tasucu Bay (Northeastern Mediterranean). Journal of Fisheries and Aquatic Science, 16(1-2): 99-105.
13. 13. Machias, A., Vassilopoulou, V., Vatsos, D., Bekas, P., Kallianiotis, A., Papaconstantinou, C. & Tsimenides, N. 2001. Bottom trawl discards in the northeastern Mediterranean Sea. Fisheries Research, 53: 181-195.
14. 14. Morgan, A.C. & Burgess, G.H. 2005. Fishery-dependent sampling: total catch, effort and catch composition. pp. 182-215. In J. Musick and R.Bonfil, (Eds) Management techniques for elasmobranch fisheries. Food and Agricultural Organization of the United Nations, Rome, 251 pp.
15. 15. Özyurt C.E., Perker M., Kiyağa V.B., Mavruk S. & Kayaalp G. 2018. Biomass of some lessepsian fish species in the soft bottoms of Iskenderun Bay (Northeast Mediterranean). Review of Hydrobiology, 1: 23-39.
16. 16. Pérez Roda, M.A., Gilman, E., Huntington, T., Kennelly, S.J., Suuronen, P., Chaloupka, M. & Medley, P. 2019. A third assessment of global marine fisheries discards. FAO Fisheries and Aquaculture Technical Paper No. 633. Rome, FAO. 78 pp.
17. 17. Soykan, O., Kınacıgil, T.H. & Tosunoğlu, Z. 2006. Taşucu Körfezi (Doğu Akdeniz) Karides Trollerinde Hedefdışı Av. Ege Universitesi Su Urunleri Fakultesi Yayınları, 23(1-2): 67-70.
18. 18. Terbıyık Kurt, T. 2018. Contribution and acclimatization of the swarming tropical copepod Dioithona oculata (Farran, 1913) in a Mediterranean coastal ecosystem. Turkish Journal of Zoology, 42: 567-577. https://doi:10.3906/zoo-1802-42
19. 19. Weissenberger, J. 2014. Fisheries: why technical measures matter. In-depth. Analysis. Brussels: European Parliamentary Research Service.
20. 20. Yağlıoğlu, D., Deniz, T., Gürlek, M., Ergüden, D. & Turan, C. 2015. Elasmobranch bycatch in a bottom trawl fishery in the Iskenderun Bay, northeastern Mediterranean. Cahiers de Biologie Marine, 56(3): 237-243.
21. 21. Yazıcı, F.M., İşmen, A., Altınağaç, U. & Ayaz, A. 2006. Marmara Deniz’inde Karides Algarnasının Av Kompozisyonu ve Hedeflenmeyen Av üzerine Bir Çalışma. Ege Universitesi Su Urunleri Fakultesi Yayınları, 23(3-4): 269-275.
22. 22. Yemişken, E., Dalyan, C. & Eryılmaz, L. 2014. Catch and discard fish species of trawl fisheries in the iskenderun Bay (North-eastern Mediterranean) with emphasis on lessepsian and chondricthyan species. Mediterranean Marine Science, 15(2): 380-389. https://doi.org/10.12681/mms.538
23. 23. Zeller, D, Cashion, T, Palomares, M. & Pauly, D. 2018. Global marine fisheries discards: A synthesis of reconstructed data. Fish and Fisheries, 19: 30-39. https://doi.org/10.1111/faf.12233