Some Morphometric Measurements of the Critically Endangered Angular Rough Shark (Oxynotus centrina (Linnaeus, 1758) Caught by Trammel Nets in the Sea of Marmara

Year 2022, Volume: 34 Issue: 1, 141 - 146, 30.03.2022

Yusuf Şen , Uğur Özekinci

https://doi.org/10.7240/jeps.1053889

Cited By: 3

Abstract

Angular rough shark is a rare occurrence and one of the critically endangered species. In this study, angular rough shark caught as bycatch with trammel nets was investigated in the Southern coasts of the Marmara Sea, Turkey. The weight of this species, which was caught in these nets, was measured as 212 gr due to the degradation by parasites. The actual weight before degradation was determined as 2623 gr from the length-weight relationship formulation. Morphometric measurements of the species were performed and compared with previous studies. As a result, the population structure and biology of critically endangered species, such as limited information about angular rough shark as bycatch in fisheries should be investigated. Fishing methods will prevent catching angular rough sharks are improved and their survival should be ensured through appropriate protective measures.

Keywords

Angular Rough Shark, By-catch, Marmara Sea, Oxynotidae, Trammel Nets

Supporting Institution

Çanakkale Onsekiz Mart University Scientific Coordination Unit.

Project Number

FDK-2020-3411

Thanks

This study was obtained from the thesis of Yusuf ŞEN, PhD student of Çanakkale Onsekiz Mart University School of Graduate Studies, Department of Fishing and Processing Technology. The authors would like to thank the research project (FDK-2020-3411) was supported by Çanakkale Onsekiz Mart University Scientific Coordination Unit.

Marmara Denizi'nde Fanyalı Uzatma Ağlarına Yakalanan Kritik Tehlike Altındaki Domuz Köpek Balığının (Oxynotus centrina (Linnaeus, 1758) Bazı Morfometrik Özellikleri

Abstract

Domuz köpek balığı, nadir bulunan ve kritik yok olma tehlikesi altında bir türdür. Bu çalışmada Marmara Denizi’nin güney kıyılarında fanyalı uzatma ağları ile tesadüfi olarak yakalanan domuz köpek balığı incelenmiştir. Ağlara yakalanan türe parazitik canlıların zarar vermesi nedeniyle ağırlığı 212 gr ölçülmüştür. Bozulmadan önceki gerçek ağırlığının ise boy-ağırlık ilişkisi formülasyonuna göre 2623 gr olduğu belirlenmiştir. Türün morfometrik ölçümleri gerçekleştirilerek, önceki çalışmalar ile karşılaştırılmıştır. Sonuç olarak, balıkçılıkta tesadüfi olarak avlanan, hakkında az bilgi bulunan yok olma tehlikesi altındaki domuz köpek balığı gibi türlerin popülasyon yapısı ve biyolojileri araştırılmalıdır. Bu türlerin ağlara yakalanmasının önüne geçecek avlama teknikleri geliştirilerek, uygun koruma önlemleri ile hayatta kalmaları sağlanmalıdır.

Keywords

Domuz Köpekbalığı, Fanyalı Uzatma Ağları, Hedefdışı Av, Marmara Denizi, Oxynotidae

Project Number

FDK-2020-3411

References

• [1] Compagno, L.J.V. (1984). FAO Species catalogue. sharks of the world. An annotated and illustrated catalogue of sharks species known to date. Part 1. Hexanchiformes to Lamniformes. FAO Fish Synopsis, 125(4): 24-129.
• [2] Serena, F. (2005). Field Identification Guide to the Sharks and Rays of the Mediterranean and Black Sea. Food and Agriculture Organization of The United Nation. ISSN 1020-6868.
• [3] Ebert, D.A. & Stehmann, M.F. (2013). Sharks, Batoids and Chimaeras of the North Atlantic. FAO Species Catalogue for Fishery Purposes 7. Rome: FAO. 523 p.
• [4] Kousteni, V. & Megalofonou, P. (2010). Occurrence of the Rare Angular Rough Shark, Oxynotus centrina, (Chondrichthyes: Oxynotidae) in the Greek Seas. GFCM-Transversal Expert Meeting on the Status of Elasmobranches in the Mediterranean and the Black Sea. Tunisia, Salammbô, 20-22 September 2010, 23 p.
• [5] Compagno, L., Dando, M. & Fowler, S. (2005). A Field Guide to the Sharks of the World. Harper Collins, London. 368 p.
• [6] Guallart, J. & Soldo, A. (2015). Oxynotus centrina. The IUCN Red List of Threatened Species Europe 2015. e.T63141A48921792. Website https://www.iucnredlist.org/species/63141/97834254 [accessed 12.07.2021].
• [7] Sion. L., Bozzano, A., D’Onghia, G., Capezzuto, F. & Panza, M. (2004). Chondrichthyes species in deep waters of the Mediterranean Sea. Scientia Marina, 68(3), 153-162. dx.doi.org/10.3989/scimar.2004.68s3153
• [8] FAO. (2021). Food and Agriculture Organization of the United Nations. Fisheries Division. Species Fact Sheets. Website http://www.fao.org/fishery/species/2843/en [accessed 12.07.2021].
• [9] Bradai, M.N., Serena, F., Bianchi, I. & Ebert, D.A. (2007). Oxynotus centrina. The IUCN Red List of Threatened Species 2007: e.T63141A12622296. Website http://dx.doi.org/10.2305/IUCN.UK.2017-3.RLTS.T10066A20191442.en [accessed 12.07.2021].
• [10] Soldo, A. & Guallart, J. (2016). Oxynotus centrina. The IUCN Red List of Threatened Species 2016: e.T63141A97834254. Website https://www.iucnredlist.org/species/63141/97834254 [accessed 12.07.2021].
• [11] Dragičević, B., Dulčić, J. & Capapé, C. (2009). Capture of a rare shark, Oxynotus centrina (Chondrichthyes: Oxynotidae) in the Eastern Adriatic Sea. Journal of Applied Ichthyology, 25(1), 56-59. doi.org/10.1111/j.1439-0426.2009.01265.x
• [12] FAO. (2009). Sharks and Rays of the Mediterranean and Black Sea. FAO Species Identification Cards. Rome, FAO. 113 p.
• [13] Eryılmaz, L. (2003). A study on the fishes of Bozcaada Island (North Aegean Sea). Turkish Journal of Marine Sciences, 9(2), 121-137.
• [14] Kabasakal, H. & Kabasakal, E. (2004). Sharks captured by commercial fishing vessels off the coast of Turkey in the Northern Aegean Sea. In Annales, Series Historia Naturalis, 14(2),171-180.
• [15] Bayhan, Y.K., Çiçek, E., Ünlüer, T. & Akkaya, M. (2006). Güneydoğu Marmara’da algarna ile karides avcılığında av kompozisyonu ve hedef dışı av. Ege Üniversitesi Su Ürünleri Dergisi, 23(3-4), 277-283.
• [16] Ismen, A., Yigin, C.C., Inceoglu, H., Arslan, M., Daban, B., Kale, S., Kocabas, E. & Sirin, M. (2013). Chondrichthyan Bycatches in the Beam Trawl Shrimp Fishery of the Marmara Sea. Conference: CIESM , France, 2 pp.
• [17] Öztekin, A., Özekinci, U. & Daban, İ.B. (2016). Length-weight relationships of 26 fish species caught by longline from the Gallipoli Peninsula, Turkey (Northern Aegean Sea). Cahiers de Biologie Marine, 57(4), 335-342.
• [18] Yığın, C.Ç., İşmen, A., Önal, U. & İhsanoğlu, M.A. (2016a). Elasmobranchs of The Sea of Marmara: Catch, Biodiversity and Conservation. The Sea of Marmara: Marine Biodiversity, Fisheries, Conservation and Governanc. Turkish Marine Research Foundation. 42, 644-654.
• [19] Yığın, C.Ç., İşmen, A. & Önal, U. (2016b). Occurrence of a rare shark, Oxynotus centrina (Chondrichthyes: Oxynotidae), from Saros Bay, north Aegean Sea, Turkey. Journal of the Black Sea/Mediterranean Environment, 22(1), 103-109.
• [20] Kabasakal, H. (2017). Remarks on incidental capture of deep-sea sharks in Marmara shelf waters. In Annales: Series Historia Naturalis, 27(2), 137-144. doi:10.19233/ASHN.2017.16
• [21] Bengil, E.G.T. & Başusta, N. (2018). Chondrichthyan species as by-catch: A review on species inhabiting Turkish waters. Journal of the Black Sea/Mediterranean Environment, 24(2), 288-305.
• [22] Şen, Y., Özekinci, U., Ayaz, A., Altınağaç, U. & Öztekin, A., (2021). Balıkçılıkta kontrollü hayalet avcılık. 4th International Congress on Agriculture, Environment and Health, 20 - 22 May 2021, Aydın, Turkey, 49.
• [23] Güven, O., Kebapçıoğlu, T. & Deval, M.C. (2012). Length–weight relationships of sharks in Antalya Bay, Eastern Mediterranean. Journal of Applied Ichthyology, 28(2), 278–279. doi.org/10.1111/j.1439-0426.2011.01823.x
• [24] Megalofonou, P. & Damalas, D. (2004). Morphological and biological characteristics of a gravid angular rough shark (Oxynotus centrina) and its embryos from the Eastern Mediterranean Sea. Cybium, 28(2), 105-110.
• [25] Kabasakal, H. (2003). Historical and contemporary records of sharks from the Sea of Marmara, Turkey. In Annales, Series Historia Naturalis, 13(1), 1-12.
• [26] Dalyan, C. (2012). Levant Denizi (Doğu Akdeniz) kuzeydoğusunun üst kıta yamacı balıklarının dağılımları. İstanbul Üniversitesi Fen Bilimleri Enstitüsü. Doktora Tezi, İstanbul. 120 s.
• [27] Başusta, N., Turan, C. & Başusta, A. (2015). New Records of gravid female and adult male of the angular rough shark, Oxynotus centrina (Oxynotidae) from the Northeastern Mediterranean. Journal of the Black Sea/Mediterranean Environment, 21(1), 92-95.
• [28] Gökçe, G., Saygu, I. & Eryaşar, A.R. (2016). Catch composition of trawl fisheries in Mersin Bay with emphasis on catch biodiversity. Turkish Journal of Zoology, 40(4), 522-533. doi:10.3906/zoo-1505-35
• [29] Yaglıoglu, D., Deniz, T., Gurlek, M., Erguden, 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.
• [30] NOAA. (2015). Impact of “Ghost Fishing” via Derelict Fishing Gear. NOAA Marine Debris Program Report. Silver Spring, MD. 1-25 pp.
• [31] Ayaz, A., Ünal, V. & Özekinci, U. (2004). İzmir Körfezi’nde hayalet avcılığa neden olan kayıp uzatma ağı miktarının tespitine yönelik bir araştırma. Ege Üniversitesi Su Ürünleri Dergisi, 21(1), 35-38.
• [32] Ayaz, A., Acarli, D., Altinagac, U., Ozekinci, U., Kara, A. & Ozen, O. (2006). Ghost fishing by monofilament and multifilament gillnets in Izmir Bay, Turkey. Fisheries Research, 79(3), 267-271. doi.org/10.1016/j.fishres.2006.03.029
• [33] Kirkim, F., Horton, T., Akyol, O. & Ceyhan, T. (2019). Natatolana neglecta (Isopoda, Cirolanidae): an increasing threat for artisanal fishing in the Turkish Aegean Sea. Crustaceana, 92(7), 881-887. doi.org/10.1163/15685403-00003914
• [34] Öndes, F. (2019). Quantification of the problem caused by isopods in the small scale fishery in the Southern Aegean Sea, Turkey. International Journal of Agricultural and Natural Sciences, 12(1), 20-22.