Güllük Körfezi’nde (Ege Denizi) balık çiftlikleri etrafında yapılan kupes (Boops boops) uzatma ağı avcılığından elde edilen hedef-dışı av oranları

Okan Ertosluk; Okan Akyol; Tevfik Ceyhan; Aytaç Özgül

doi:10.12714/egejfas.40.2.08

EN TR

By-catch ratios from the bogue (Boops boops) gillnet fishery around the sea-cage fish farms in Güllük Bay (Aegean Sea)

Abstract

This study aims to reveal the by-catch rates for gillnet fishery, targeted Boops boops by small-scale fisheries around fish farms in Güllük Bay (Aegean Sea), and to determine the by-catch per unit effort (BPUE) rates. The study was carried out through deck sampling at Göltürkbükü, Gündoğan, Yalıkavak, and Torba fishing ports during two seasons between November and April (2017-2018 / 2018-2019). A total of 147 fishing operations from 13 boats were randomly monitored. In gillnet fishing for bogue, a total of 18163 kg of the catch was caught from 48 species belonging to 30 families, including invertebrates. The target Boops boops was the most common species with a rate of 91.9%, of which 8.1% was determined as a by-catch. The most caught by-catch species are Diplodus annularis (Linnaeus, 1758), Scomber colias (Gmelin, 1789), Trachurus trachurus (Linnaeus, 1758), Pagellus acarne (Risso, 1827), Scomber scombrus (Linnaeus, 1758). While the average BPUE was 4.77 ± 0.85 kg.1000 m-1 in 2018, it was 3.20 ± 0.58 kg.1000 m-1 in 2019. November gives the highest average in terms of BPUE values. The average BPUE ranged from 0 to 19.1 kg.1000 m-1 (mean: 7.97 ± 2.83 kg.1000 m-1). Statistically, there is a significant difference in BPUE values between the months (Kruskal-Wallis test, p < 0.05).

Keywords

Güllük Körfezi’nde (Ege Denizi) balık çiftlikleri etrafında yapılan kupes (Boops boops) uzatma ağı avcılığından elde edilen hedef-dışı av oranları

Öz

Bu çalışma, Güllük Körfezi'ndeki (Ege Denizi) balık çiftlikleri çevresinde küçük ölçekli balıkçı tekneleri tarafından uzatma ağlarıyla hedeflenen Boops boops avcılığı sırasındaki hedef dışı avı ortaya koymak ve birim çaba başına hedef dışı av (BPUE) oranlarını belirlemeyi amaçlamaktadır. Çalışma, Kasım-Nisan arasındaki iki sezon boyunca (2017-2018 / 2018-2019), Göltürkbükü, Gündoğan, Yalıkavak ve Torba limanlarında rıhtım örneklemeleri yoluyla gerçekleştirilmiştir. Toplam 13 kupes avcısı tekneden 147 balıkçılık operasyonu rastgele izlenmiştir. Kupes uzatma ağı ile avcılıkta omurgasızlar dâhil 30 familyaya ait 48 türden toplam 18163 kg av yakalanmıştır. Hedef balık olan Boops boops en bol (%91,9) bulunan tür olup, bunun %8,1’si hedef dışı av olarak kaydedilmiştir. Hedef dışı avda en çok yakalanan türler sırasıyla Diplodus annularis (Linnaeus, 1758), Scomber colias (Gmelin, 1789), Trachurus trachurus (Linnaeus, 1758), Pagellus acarne (Risso, 1827), Scomber scombrus (Linnaeus, 1758)’tur. 2018 yılı ortalama BPUE 4,77 ± 0,85 kg.1000 m-1, 2019 yılı BPUE ise 3,20 ± 0,58 kg.1000 m-1 olarak hesaplanmıştır. Kasım ayı BPUE değerleri açısından en yüksek ortalamayı vermektedir. Ortalama BPUE 0 ile 19,1 kg.1000 m-1 arasında (ortalama: 7,97 ± 2,83 kg.1000 m-1) değişmiştir. İstatistiki olarak aylar arasında BPUE değerleri bakımından önemli bir fark vardır (Kruskal-Wallis test, p < 0,05).

Anahtar Kelimeler

Supporting Institution

Aydın Adnan Menderes Üniversitesi Bilimsel Araştırma Projeleri Koordinasyon Birimi

Project Number

17002

Thanks

Yazarlar, finansal destekleri için Aydın Adnan Menderes Üniversitesi Bilimsel Araştırma Projeleri Koordinatörlüğü birimine [Proje No: BOMYO-17002] teşekkür ederler.

References

Akyol, O., & Ertosluk, O. (2010). Fishing near sea-cage farms along the coast of the Turkish Aegean Sea. Journal of Applied Ichthyology, 26(1), 11–15. https://doi.org/10.1111/j.1439-0426.2009.01348.x
Akyol, O., Kara, A., & Sağlam, C. (2014). Maximum size of saddled bream Oblada melanura Linnaeus, 1758 Osteichthyes Sparidae in the Southern Aegean Sea Turkey. Journal of the Black Sea/Mediterranean Environment, 20, 270-273.
Akyol, O., Özgül, A., Şen, H., Düzbastılar, F.O., & Ceyhan, T. (2019). Determining potential conﬂicts between small-scale fisheries and sea-cage fish farms in the Aegean Sea. Acta Ichthyologica Piscatoria, 49(4), 365–372.https://doi.org/10.3750/AIEP/02681
Akyol, O., Özgül, A., Düzbastılar, F.O., Şen, H., Ortiz de Urbina, J.M., & Ceyhan, T. (2020). Seasonal variations in wild fish aggregation near sea-cage fish farms in the Turkish Aegean Sea. Aquaculture Reports, 18, 100478. https://doi.org/10.1016/j.aqrep.2020.100478
Alverson, D. L., Freeberg, M. H., Murawski, S. A., & Pope, J. G. (1994). A Global Assessment of Fisheries Bycatch and Discards. FAO Fisheries Technical Papers, 339, 233.
Anonim. (2016). 4/2 Communiqué No. 4/2 on the Regulation of Fishery for Amateur Purposes (in Turkish) [4/2 Numaralı Amatör Amaçlı Su Ürünleri Avcılığının Düzenlenmesi Hakkında Tebliğ]. Gıda, Tarım ve Hayvancılık Bakanlığı, Tebliğ No: 2016/36.
Arechavala-Lopez, P., Sanchez-Jerez, P., Bayle-Sempere, J., Fernandez-Jover, D., Martinez-Rubio, L., Lopez-Jimenez, J.A., & Martinez-Lopez, F.J. (2011). Direct interaction between wild fish aggregations at fish farms and fisheries activity at fishing grounds: a case study with Boops boops. Aquaculture Research, 42, 996–1010. https://doi.org/10.1111/j.1365-2109.2010.02683.x
Bacher, K., & Gordoa, A. (2016). Does marine fish farming affect local small-scale fishery catches? A case study in the NW Mediterranean Sea. Aquaculture Research, 47(8): 2444–2454. https://doi.org/10.1111/are.12692

Ceyhan, T., Ertosluk, O., Akyol, O., & Özgül, A. (2018). The maximum size of bogue, Boops boops (Perciformes: Sparidae) for the Mediterranean. Acta Aquatica Turcica, 14, 399-403. https://doi.org/10.22392/egirdir.463612
de Metrio, G., & Megalafonou, P. (1988). Catch, Size Distribution, Growth and Sex Ratio of Swordfish (Xiphias gladius L.) in the Gulf of Taranto. FAO Fish Report, No. 394, 91-102, Rome.
Dempster, T., Sanchez-Jerez, P., Bayle-Sempere, J.T., Gimenez-Casalduero, F., & Valle, C. (2002). Attraction of wild fish to sea-cage fish farms in the South-Western Mediterranean Sea: Spatial and short-term temporal variability. Marine Ecology Progress Series, 242, 237–252. https://doi.org/10.3354/meps242237
Dempster, T., & Taquet, M. (2004). Fish aggregation device (FAD) research: gaps in current farming and its appeal to common bottlenose dolphins: modeling habitat use in a Mediterranean embayment. Aquatic Conservation Journal, 24, 696–711. https://doi.org/10.1002/aqc.2401
Fernandez-Jover, D. Sanchez-Jerez, P., Bayle-Sempere, J.T., Vale, C., & Demster, T. (2008). Seasonal patterns and diets of wild fish assemblages associated with Mediterranean coastal fish farms. ICES Journal of Marine Science, 65(7): 1153–1160. https://doi.org/10.1093/icesjms/fsn091
Izquierdo-Gomez, D., Gonzalez-Silvera, D., Arechavala-Lopez, P., Lopez-Jimenez, J.A., Bayle-Sempere, J.T., & Sanchez-Jerez, P. (2015). Exportation of excess feed from Mediterranean fish farms to local fisheries through different targeted fish species, ICES Journal of Marine Science. 72(3): 930–938. https://doi.org/10.1093/icesjms/fsu179
R Core Team (2022). R: A Language and Environment for Statistical Computing. Vienna, Austria. Retrieved from https://www.R-project.org/
Saila, S.B. (1983). Importance and Assessment of Discards in Commercial Fisheries, FAO Fisheries Circular, 765, 62.
Sanchez-Jerez, P., Bayle-Sempere, J., Fernandez-Jover, D., Valle, C., & Dempster, T. (2007). Ecological relationship between wild fish populations and Mediterranean aquaculture in floating fish cages. Impact of mariculture on coastal ecosystems. Lisboa, 21-24 Feb., CIESM Workshop Monographs, No. 32 86.
Şensurat-Genç, T., Akyol, O., Özgül, A., & Özden, U. (2019). Food composition of whiting Merlangius merlangus, captured around the sea-cage fish farms in Ordu, South-Eastern Black Sea. Journal of the Marine Biological Association of the United Kingdom, 99, 1651-1659. https://doi.org/10.1017/S0025315419000626
Valle, C., Bayle-Sempere, J.T., Dempster, T., Sanchez-Jerez, P., & Gimenez-Casalduero, F. (2007). Temporal variability of wild fish assemblages associated with a sea-cage fish farm in the South-Western Mediterranean Sea. Estuarine, Coastal and Shelf Science, 72, 299-307. https://doi.org/10.1016/j.ecss.2006.10.019
Wickham, H., Averick, M., Bryan, J., Chang, W., McGowan, L.D., François, R., Grolemund, G., Hayes, A., Henry, L., Hester, J., Kuhn, M., Pedersen, T.L., Miller, E., Bache, S.M., Müller, K., Ooms, J., Robinson, D., Seidel, D.P., Spinu, V., Takahashi, K., Vaughan, D., Wilke, C., Woo, K., & Yutani, H. (2019). Welcome to the tidyverse. Journal of Open-Source Software, 4(43), 1686. https://doi.org/10.21105/joss.01686

Details

Primary Language

Turkish

Subjects

Fisheries Management

Journal Section

Research Article

Authors

Okan Ertosluk ^*
0000-0003-3579-6910
Türkiye

Okan Akyol
0000-0001-7738-2156
Türkiye

Tevfik Ceyhan
0000-0002-4799-5709
Türkiye

Aytaç Özgül
0000-0001-7706-9012
Türkiye

Early Pub Date

June 10, 2023

Publication Date

June 15, 2023

Submission Date

April 11, 2022

Acceptance Date

August 10, 2022

Published in Issue

Year 2023 Volume: 40 Number: 2

DOI

https://doi.org/10.12714/egejfas.40.2.08

IZ

https://izlik.org/JA68BW69ZA

Cite

RIS / Bibtex

APA

Ertosluk, O., Akyol, O., Ceyhan, T., & Özgül, A. (2023). Güllük Körfezi’nde (Ege Denizi) balık çiftlikleri etrafında yapılan kupes (Boops boops) uzatma ağı avcılığından elde edilen hedef-dışı av oranları. Ege Journal of Fisheries and Aquatic Sciences, 40(2), 140-144. https://doi.org/10.12714/egejfas.40.2.08