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Comparison of selectivity of the trawl codends for whiting (Merlangius merlangus euxinus) in the Black Sea

Year 2019, Volume 36, Issue 3, 301 - 311, 15.09.2019
https://doi.org/10.12714/egejfas.2019.36.3.11

Abstract



A large part of the total whiting (Merlangius merlangus euxinus) fishing in the Black Sea is carried out with the traditional bottom trawl nets along the coast of Turkey. Diamond mesh shape with 40 mm mesh size (40D) has been used in the codends of these trawls. In this study, the traditional trawl codend (40D) and square-mesh codend with different size (36S and 40S) were compared for whiting size selectivity in August 2014. Selectivity data were collected by using a covered codend method and analysed taking between haul variations in to account. The selectivity parameters were estimated by using CC2000 software. Results showed that commercially used 40D trawl codend is not selective enough to release immature of whiting. However, the net change in square mesh (36S and 40S) instead of a diamond-shaped (40D) mesh significantly improved the mesh selectivity for whiting. The 40S trawl codend is even higher than the first maturity size (LM50) with a length at fifty percent retention (L50) of 15.74 cm. In conclusion all square mesh codends with different mesh size tested here supplied appropriate selection considering minimum landing size (MLS) of whiting.




References

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  • Deval, M.C., Bök, T., Ateş, C., Ulutürk, T. & Tosunoğlu Z. (2009). Comparison of the size selectivity of diamond (PA) and square (PE) mesh codends for deepwater crustacean species in the Antalya Bay, eastern Mediterranean. Journal of Applied Ichthyology, 25, 372–380. DOI:10.1111/j.1439-0426.2009.01239.x
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  • Fryer, R.J. & Shepherd, J.G. (1996). Models of codend size selection. Journal of Northwest Atlantic Fishery Science, 19, 91–102.
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Karadeniz’de Mezgit (Merlangius merlangus euxinus) avcılığındaki trol torba seçiciliklerinin karşılaştırılması

Year 2019, Volume 36, Issue 3, 301 - 311, 15.09.2019
https://doi.org/10.12714/egejfas.2019.36.3.11

Abstract



Karadeniz'de toplam mezgit (Merlangius merlangus euxinus) balığı avcılığının büyük bir kısmı, Türkiye kıyılarındaki geleneksel dip trol ağları ile gerçekleştirilmektedir. 40 mm ağ göz büyüklüğünde (40D) baklava gözlü ağlar bu trollerin torbalarında kullanılmaktadır. Bu çalışmada, geleneksel dip trol torbası (40D) ve farklı ağ göz büyüklüğündeki kare gözlü (36S ve 40S) trol torbaları mezgit balığının boy seçiciliği için mukayese edildi. Seçicilik verileri bir örtü torba yöntemi kullanılarak toplandı ve çekimler arası varyasyonlar hesaba katılarak analiz edildi. Seçicilik parametreleri CC2000 programı kullanılarak hesaplandı. Sonuçlar ticari olarak kullanılan 40D trol torbasının mezgit balığının olgunlaşmamış bireyleri için seçici olmadığını göstermiştir. Oysa baklava gözlü (40D) trol torbası yerine kare gözlü torba (36S ve 40D) değişikliği mezgit balığı için ağ göz seçiciliğini önemli ölçüde artırmıştır.  40S trol torbası 15,74 cm yüzde elli yakalanma oranı (L50) ile ilk üreme boyundan daha yüksektir (LM50). Sonuç olarak çalışmada denemeye alınan farklı ağ göz boyundaki tüm kare gözlü torbalar, mezgit balığının karaya çıkarılma büyüklüğü (MLS) göz önünde bulundurulduğunda uygun seçicilik sağlamıştır.




References

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  • Armstrong, D.W., Ferro, R.S.T., MacLennan, D.N. & Reeves, S.A. (1990). Gear selectivity and the conservation of fish. Journal of Fish Biology, 37, 261–262. DOI:10.1111/j.1095-8649.1990.tb05060.x
  • Ateş, C., Deval, M.C., Bök, T. & Tosunoğlu, Z. (2010). Selectivity of diamond (PA) and square (PE) mesh codends for commercially important fish species in the Antalya Bay, Eastern Mediterranean. Journal of Applied Ichthyology, 26, 465–471. DOI:10.1111/j.1439-0426.2010.01462.x
  • Aydın, C. & Tosunoğlu, Z. (2010). Selectivity of diamond, square and hexagonal mesh codends for Atlantic horse mackerel (Trachurus trachurus), European hake (Merluccius merluccius) and greater forkbeard (Phycis blennoides) in the eastern Mediterranean. Journal of Applied Ichthyology, 26, 71-77. DOI: 10.1111/j.1439-0426.2009.01376.x
  • Aydın, C., Tokaç, A., Ulaş, A., Maktay, B. & Şensurat, T. (2011). Selectivity of 40 mm square and 50 mm diamond mesh codends for five species in the Eastern Mediterranean demersal trawl fishery. African Journal of Biotechnology, 10, 5037–5047. DOI:10.5897/AJB11.082
  • Aydın, C. & Tokaç, A. (2015). Selectivity of 40 mm square- and 90º turned-mesh codend for the deepwater rose shrimp, Parapenaeus longirostris (Crustacea), and greater forkbeard, Phycis blennoides (Actinopterygii: Gadiformes: Phycidae), in the eastern Mediterranean. Acta Ichthyologica Piscatoria, 45(4), 353–362. DOI: 10.3750/AIP2015.45.4.03
  • Bahamon, N., Sardà, F. & Suuronen, P. (2006). Improvement of trawl selectivity in the NW Mediterranean demersal fishery by using a 40 mm square mesh codend. Fisheries Research, 81, 15–25. DOI:10.1016/j.fishres.2006.05.020
  • Bilgin, S., Bal H. & Taşcı, B. (2012). Length Based Growth Estimates and Reproduction Biology of Whiting, Merlangius merlangus euxinus (Nordman, 1840) in the Southeast Black Sea. Turkish Journal of Fisheries and Aquatic Science, 12, 871-881. DOI:10.4194/1303-2712-v12_4_15
  • Brčić, J., Herrmann, B. & Sala, A. (2018). Can a square-mesh panel inserted in front of the codend improve size and species selectivity in Mediterranean trawl fisheries? Canadian Journal of Fisheries and Aquatic Science, 75(5), 704-713. DOI:10.1139/cjfas-2017-0123
  • Broadhurst, M.K. & Millar, R.B. (2009). Square-mesh codend circumference and selectivity. ICES Journal of Marine Science, 66, 566-572. DOI:10.1093/icesjms/fsp001
  • Ceylan, Y., Şahin, C. & Kalaycı, F. (2014). Bottom trawl fishery discards on the Black Sea coast of Turkey. Mediterranean Marine Science, 15(1), 156-164. DOI:10.12681/mms.421
  • ConStat. (1995). CC Selectivity. Granspaettevej 10, DK 9800 Hjjlarring, Denmark
  • Dahm, E., Wienbeck, H., West, C.W., Valdemarsen, J.W. & O’Neill, F.G. (2002). On the influence of towing speed and gear size on the selective properties of bottom trawls. Fisheries Research, 55, 103-119. DOI:10.1016/S0165-7836(01)00301-0
  • Deval, M.C., Bök, T., Ateş, C., Ulutürk, T. & Tosunoğlu Z. (2009). Comparison of the size selectivity of diamond (PA) and square (PE) mesh codends for deepwater crustacean species in the Antalya Bay, eastern Mediterranean. Journal of Applied Ichthyology, 25, 372–380. DOI:10.1111/j.1439-0426.2009.01239.x
  • Düzbastilar, F.O., Breen, M., Aydın, C., Özbilgin, H., Özgül, A., Ulaş, A., Metin, G., Gül, B. & Lök A. (2017). Seasonal variation in mortality of red mullet (Mullus barbatus) escaping from codends of three different sizes in the Aegean Sea. Scientia Marina, 81(3), 339-349. DOI:10.3989/scimar.04600.19A
  • Düzbastılar, F.O., Laleli, T., Özgül, A. & Metin, G. (2015). Determining the severity of skin injuries of red mullet, Mullus barbatus (Actinopterygii: Perciformes: Mullidae), inflicted during escape from trawl codend. Acta Ichthyologica Piscatoria, 45(1), 75–83. DOI:10.3750/AIP2015.45.1.08
  • E.C. (2006). Council regulation (EC 1967/2006) concerning management measures for the sustainable exploitation of fishery resources in the Mediterranean Sea, amending Regulation (EEC) No. 2847/93 and repealing Regulation (EC) No.1626/94. Off. J. Eur. Union 409, 75.
  • Eryaşar, A.R. & Özbilgin, H. (2015). Implications for catch composition and revenue in changing from diamond to square mesh codends in the north-eastern Mediterranean. Journal of Applied Ichthyology, 31, 282–289. DOI:10.1111/jai.12643
  • Fryer, R. (1991). A model of the between-haul variation in selectivity. ICES Journal of Marine Science, 48(3), 281–290. DOI:10.1093/icesjms/48.3.281
  • Fryer, R.J. & Shepherd, J.G. (1996). Models of codend size selection. Journal of Northwest Atlantic Fishery Science, 19, 91–102.
  • Genç, Y., Mutlu, C., Zengin, M., Aydın, İ., Zengin, B. & Tabak İ. (2002). Doğu Karadeniz’deki av gücünün demersal balık stokları üzerine etkisinin tespiti. [Determination of the effect of catch effort on stocks of demersal fish in Eastern Black Sea]. (Report No: TAGEM/IY/97/17/03/006). Trabzon, Turkey, CFRI Press., 114 pp [In Turkish.]
  • GFCM. (2010). Report of the Transversal Workshop on Selectivity Improvement, By-Catch Reduction and Alternative Gears, Alexandria, Egypt, 25–27 October.
  • Graham, N., Kynoch, R.J. & Fryer R.J. (2003). Square mesh panel in demersal trawls: Further data relating haddock and whiting selectivity to panel position. Fisheries Research, 62(3), 361-375. DOI:10.1016/S0165-7836(02)00279-5
  • Guijarro, B. & Massuti, E. (2006). Selectivity of diamond- and square-mesh codends in the deep water crustacean trawl fishery off the Balearic Islands (western Mediterranean). ICES Journal of Marine Science, 63, 52–67. DOI:10.1016/j.icesjms.2005.08.011
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Details

Primary Language English
Subjects Science
Journal Section Articles
Authors

Mustafa ZENGİN
0000-0003-0225-9182
Türkiye


İlkay ÖZCAN AKPINAR
0000-0003-1421-984X
Türkiye


Muharrem Hakan KAYKAÇ (Primary Author)
EGE ÜNİVERSİTESİ, SU ÜRÜNLERİ FAKÜLTESİ
0000-0002-4807-707X
Türkiye


Zafer TOSUNOĞLU
EGE ÜNİVERSİTESİ, SU ÜRÜNLERİ FAKÜLTESİ
0000-0002-1168-9611
Türkiye

Supporting Institution European Union
Project Number EU-FP7-312008
Thanks This work was financed by the European Project “BENTHIS (EU-FP7-312008)”. The authors would like to thanks and gratitude to the project leader Prof. Dr. Adrian RJINSDORP providing all kinds of support. Thanks are also due to all the project researchers for participating the sea trials.
Publication Date September 15, 2019
Application Date February 13, 2019
Acceptance Date July 1, 2019
Published in Issue Year 2019, Volume 36, Issue 3

Cite

APA Zengin, M. , Özcan Akpınar, İ. , Kaykaç, M. H. & Tosunoğlu, Z. (2019). Comparison of selectivity of the trawl codends for whiting (Merlangius merlangus euxinus) in the Black Sea . Ege Journal of Fisheries and Aquatic Sciences , 36 (3) , 301-311 . DOI: 10.12714/egejfas.2019.36.3.11