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Selectivity of turned meshes codends for Deepwater Rose Shrimp (Parapenaeus longirostris), Horse Mackerel, (Trachurus trachurus) and European Hake (Merluccius merluccius) in the Aegean Sea

Year 2018, Volume: 35 Issue: 2, 157 - 168, 15.06.2018

Tuğçe Şensurat Genç , Muhammed Atamanalp Celalettin Aydın

https://doi.org/10.12714/egejfas.2018.35.2.08
Cited By: 2

Abstract

More than fifty published on demersal trawl codend selectivity studies have been carried out in the Mediterranean waters of Turkey since the mid-1980s. In this study, in an attempt to enhance the size selectivity of three species in the Aegean Sea trawl fisheries, three 90o turned meshes codens were investigated. Experiments were carried out in the Kuşadası Bay of the Eastern Mediterranean, between 19 January and 29 March 2015 with commercial stern trawler. The meshes of tested codends were turned 90o , two of them have 44 mm mesh size with 300 and 150 meshes around codend circumferences (44T300 and 44T150). The other has 40 mm mesh size with 165 meshes around codend circumferences (40T165). Individual hauls and mean selectivity parameters were estimated by using the CC2000 and EC-Modeller softwares, respectively. The mean L50 values of 44T300, 44T150 and 40T165 were 17.5 ± 0.2 mm, 18.6 ± 0.1 mm and 17.1 ± 0.2 mm carapace length for shrimp, 16.4 ± 0.4 cm, 17.1 ± 0.4 cm and 14.8 ± 0.2 cm total length for horse mackerel, respectively. The pooled L50 values of, 12.8 ± 0.5 cm, 13.2 ± 0.6 cm and 12.1 ± 0.1 cm total length for hake. While there are no differences between L50 values of 40T165 and 44T300 for deepwater rose shrimp (p>0.05), there are significant differences for horse mackerel (p<0.05). The likelihood ratio test results showed that there were no significant differences among all codends for European hake. In conclusion, any effort such as using square mesh, turned mesh codends or halved the number of meshes in the codend to release immatures of some species, is probably to cause the loss of marketable sizes of other species in the Mediterranean. This economical loss of revenues is the essential concern of fishermen that prevents them using alternative codend designs, though such designs are technically applicable. Consequently, the losses of income caused by using T90 mesh codend and halving the number of meshes around codend circumference should also be investigated in future studies

Keywords

demersal trawl turned meshes deepwater rose shrimp horse mackerel European hake Aegean Sea

References

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Ege Denizi’nde Derinsu Pembe Karidesi (Parapenaeus longirostris), İstavrit (Trachurus trachurus) ve Bakalyaro için (Merluccius merluccius) döndürülmüş ağ gözü torba seçiciliği

Year 2018, Volume: 35 Issue: 2, 157 - 168, 15.06.2018

Tuğçe Şensurat Genç , Muhammed Atamanalp Celalettin Aydın

https://doi.org/10.12714/egejfas.2018.35.2.08
Cited By: 2

Abstract

Türkiye’nin Akdeniz sularında 1980’lerin ortalarından beri demersal trol torba seçiciliği üzerine elliden fazla çalışma yürütülmüştür. Bu çalışmada Ege Denizi trol balıkçılığında 3 türün boy seçiciliğini geliştirmek için 3 farklı döndürülmüş ağ göz torbaları araştırılmıştır. Denemeler Doğu Akdeniz’de bulunan Kuşadası Körfezi’nde 19 Ocak ve 29 Mart 2015 tarihleri arasında ticari trol teknesiyle gerçekleştirilmiştir. Deneme torbalarının ağ gözleri 90o döndürülmüş olup ikisi 44 mm ağ göz boyunda, 300 ve 150 torba çevre göz sayısına sahiptir (44T300 ve 44T150). Diğer torba 165 çevre göz sayısına sahip 40 mm ağ göz boyundadır. Bireysel çekimler ve ortalama seçicilik parametreleri sırasıyla CC2000 ve EC-Modeller yazılımları kullanılarak hesaplanmıştır. Derinsu pembe karidesinin 44T300, 44T150 ve 40T165 torbalarında ortalama L50 değerleri sırasıyla 17,5 ± 0,2 mm, 18,6 ± 0,1 mm ve 17,1 ± 0,2 mm karapas boyu, istavritin 16,4 ± 0,4 cm, 17,1 ± 0,4 cm and 14,8 ± 0,2 cm total boydur. Bakalyaronun birleştirilmiş L50 değerleri 12,8 ± 0,5 cm, 13,2 ± 0,6 cm ve 12,1 ± 0,1 cm total boydur. Derinsu pembe karidesi için 40T165 ve 44T300’den elde edilen L50 değerleri arasında fark yokken (p>0,05), istavrit için önemli fark vardır (p<0,05). Olabilirlik oran test sonuçları bakalyaro için tüm torbalar arasında istatistiksel olarak önemli bir fark bulunamamıştır. Sonuç olarak Akdenizde bazı türlerin jüvenillerini serbest bırakmak için kare gözlü, döndürülmüş gözlü torba kullanma veya torba etrafındaki göz sayısını yarıya düşürme gibi çabalar, pazarlanabilir boydaki diğer türlerin kaybına neden olabilmektedir. Alternatif torbalar teknik olarak uygulanabilir olmalarına rağmen, ekonomik gelir kaybı balıkçıların torbaları kullanmalarını önleyen esas kaygıdır. Bu nedenle, T90 torba ve torba çevre göz sayısının yarıya indirilmesinin sebep olacağı gelir kayıpları gelecek çalışmalarda araştırılmalıdır. 

Keywords

döndürülmüş torba derinsu pembe karidesi istavrit bakalyaro Ege Denizi Demersal trol

References

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  • Anonymous (2012). Notification 3/1 Regulating Commercial Fishing (in Turkish). Republic of Turkey, Minister of Agriculture and Rural Affair, General Directorate of Conservation and Inspection, Ankara, 112 pp.
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  • Arkley, K. (2008). Reducing drag in towed fishing gear – fishing trials to evaluate the performance of a trawl constructed from T90 (‘turned mesh’) netting. Final Report, SR595, 37 pp.
  • 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 et Piscatoria, 45 (4), 353-362. DOI: 10.3750/AIP2015.45.4.03
  • 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(25), 5037-5047. DOI: 10.5897/AJB11.082
  • Aydın, C., & Tosunoğlu, Z. (2009). Selectivity of square and hexagonal mesh codends for the deep water rose shrimp, Parapenaus longirostris (Lucas, 1846) (Decapoda, Penaidae) in the Aegean Sea. Crustaceana, 82(1), 89–98. DOI: 10.1163/156854008x363704
  • 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(1), 71-77. DOI: 10.1111/j.1439-0426.2009.01376.x
  • Aydın, C., Tosunoğlu, Z., & Özbi̇lgi̇n, H. (2009). Selectivity of double and single codends for the deep-water rose shrimp, Parapenaeus longirostris (Lucas, 1846) (Decapoda, Penaeidae) in the Aegean Sea trawl fishery. Crustaceana, 82(2), 233-240. DOI: 10.1163/156854008x380264
  • Bahamon, N., Sarda, F., & Suuronen, P. (2006). Improvement of trawl selectivity in the NW Mediterranean demersal fishery by using a 40mm square mesh codend. Fisheries Research, 81(1), 15-25. DOI: 10.1016/j.fishres.2006.05.020 Broadhurst, M. K., & Kennelly, S. J. (1996). Effects of the circumference of codends and a new design of square-mesh panel in reducing unwanted by-catch in the New South Wales oceanic prawn-trawl fishery, Australia. Fisheries Research, 27(4), 203-214. DOI: 10.1016/0165-7836(95)00469-6
  • Broadhurst, M. K., Millar, R. B., Kennelly, S. J., Macbeth, W. G., Young, D. J., & Gray, C. A. (2004). Selectivity of conventional diamond-and novel square-mesh codends in an Australian estuarine penaeid-trawl fishery. Fisheries Research, 67(2), 183-194. DOI: 10.1016/j.fishres.2003.09.043
  • Campos, A., Fonseca, P., & Henriques, V. (2003). Size selectivity for four fish species of the deep groundfish assemblage off the Portuguese southwest coast: evidence of mesh size, mesh configuration and cod end catch effects. Fisheries research, 63(2), 213-233. DOI: 10.1016/S0165-7836(03)00060-2
  • ConStat (1995). CC selectivity. Gronspaettevej 10, DK-9800 Hjorring, Denmark.
  • Dereli, H. (2010). Sığacık Körfezi’nde dip troll ağları ile yakalan derinsu pembe karidesi (Parapenaeus longirostris Lucas, 1846)’nin bazı biyolojik ve populasyon özellikleri. Ege Üniversitesi Fen Bilimleri Enstitüsü, Doktora Tezi, İzmir (in Turkish).
  • Dereli, H., & Aydın, C. (2016). Selectivity of Commercial and Alternative Codends for Four Species in the Eastern Mediterranean Demersal Trawl Fishery. Turkish Journal of Fisheries and Aquatic Sciences, 16(4), 971-992. DOI: 10.4194/1303-2712-v16_4_25
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There are 56 citations in total.

Details

Primary Language English
Journal Section Articles
Authors

Tuğçe Şensurat Genç 0000-0002-5528-3322

Muhammed Atamanalp 0000-0002-2038-3921

Celalettin Aydın 0000-0001-8993-6013

Publication Date June 15, 2018
Submission Date January 4, 2018
Published in Issue Year 2018 Volume: 35 Issue: 2

Cite

APA Şensurat Genç, T., Atamanalp, M., & Aydın, C. (2018). Selectivity of turned meshes codends for Deepwater Rose Shrimp (Parapenaeus longirostris), Horse Mackerel, (Trachurus trachurus) and European Hake (Merluccius merluccius) in the Aegean Sea. Ege Journal of Fisheries and Aquatic Sciences, 35(2), 157-168. https://doi.org/10.12714/egejfas.2018.35.2.08

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