Mavi Köpekbalığı Prionace glauca (Linnaeus, 1758)'nın (Chondrichthyes: Charcharhinidae) Fethiye Açıklarında (Akdeniz) Kılıç Paraketası ile Yakalanması

Yıl 2020, , 47 - 50, 03.07.2020

Okan Akyol , Tevfik Ceyhan

https://doi.org/10.46384/jmsf.744332

Öz

25 Aralık 2012'de bir Prionace glauca (Linnaeus, 1758) örneği, Fethiye'den 1200 m derinlikte 9 kılıç balığı ile birlikte bir kılıç balığı paraketa av teknesi tarafından yakalanmıştır. Yakalanan örnek TL olarak ölçüldükten sonra tartılarak (kg) fotoğraflanmıştır. Birey 85 cm uzunluğunda ve 7 kg ağırlığındaydı. Önceki çalışmalara göre, mavi köpekbalıkları özellikle Kuzey Ege Denizi'nde bolca gözlenmekteyken, kılıç balığı avcılığının zayıf olarak bölgede var olması nedeniyle çok nadir olarak rastlantısal düzeyde avlandığı kabul edilebilir. Bununla birlikte, mavi köpekbalıkları küresel yüzgeç ticaretinde önemli bir yer tutmaktadır. Bu nedenle, bu köpekbalığı türünün nüfus eğilimi hızla azalmaktadır.

Anahtar Kelimeler

Mavi Köpekbalığı, Carcharhinidae, Yüzen Paraketa, Fethiye Kıyıları, Tesadüfi Av

Capture of a Blue Shark Prionace glauca (Linnaeus, 1758) (Chondrichthyes: Charcharhinidae) by a Swordfish Longliner off Fethiye (Mediterranean Sea, Turkey)

Öz

On 25 December 2012, a specimen of Prionace glauca (Linnaeus, 1758) was caught by a swordfish longliner along with 9 swordfish together off Fethiye at a depth of 1200 m. The specimen caught was measured as TL and weighed (kg), and photographed. The specimen was 85 cm TL and 7 kg. According to the previous studies, blue sharks especially observed abundantly in northern Aegean Sea, and can be accepted very rare incidental catch from the Turkish coasts owing to weak presuppose of swordfish fishery. However, there is an important place of blue sharks in the global fin trade area. Therefore, population trend of this shark species is swift decreasing.

Anahtar Kelimeler

Blue shark, Carcharhinidae,, floating longline, incidental catch, Fethiye Coast

Kaynakça

• Bilecenoğlu, M., Kaya, M., Cihangir, B. & Çiçek, E. (2014). An updated checklist of the marine fishes of Turkey. Turkish Journal of Zoology, 38, 901-929. DOI: 10.3906/zoo-1405-60
• Camhi, M.D., Valenti, S.V., Fordham, S.V., Fowler, S.L. & Gibson, C. (2009). The Conservation Status of Pelagic Sharks and Rays: Report of the IUCN Shark Specialist Group Pelagic Shark Red List Workshop. IUCN Species Survival Commission Shark Specialist Group. Newbury, UK., 78 p.
• Ceyhan, T. & Akyol, O. (2014). On the Turkish surface longline fishery targeting swordfish in the Eastern Mediterranean Sea. Turkish Journal of Fisheries and Aquatic Sciences, 14, 825-830. DOI: 10.4194/1303-2712-v14_3_25
• Compagno, L.J.V. (1984). FAO Species Catalogue. Vol. 4. Sharks of the world. An annotated and illustrated catalogue of shark species known to date. Part 2 - Carcharhiniformes. FAO Fish. Synop. 125(4/2):251-655. Rome: FAO.
• Froese, R. & Pauly, D. (2019). Fishbase. World Wide Web Electronic Publication. [version 12/2019] http://www.fishbase.org/accessed: 16 March 2020.
• Golani, D., Öztürk, B. & Başusta, N. (2006). Fishes of the eastern Mediterranean, Turkish Marine Research Foundation (Publication no.24), İstanbul, Turkey.
• Gönülal, O. (2017). Length-weight relationships of 16 fish species from deep water of Northern Aegean Sea (500-900 m). Turkish Journal of Fisheries and Aquatic Sciences, 17,995-1002. DOI: 10.4194/1303-2712-v17_5_14
• Kabasakal, H. (2002). Elasmobranch species of the Seas of Turkey. Annales Series historia naturalis, 12, 15–22.
• Kabasakal, H. & Kabasakal, E. (2004). Sharks captured by commercial fishing vessels off the coast of Turkey in the northern Aegean Sea. Annales Series historia naturalis, 14, 171–180.
• Kabasakal, H. (2010). On the occurrence of the Blue Shark, Prionace glauca (Chondrichthyes: Carcharhinidae), off Turkish coast of Northern Aegean Sea. Marine Biodiversity Records, Vol.3, e31, p.1-4. DOI: 10.1017/S1755267310000266
• Megalafonou, P., Yannopoulos, C., Damalas, D., De Metrio, G., Deflorio, M., de la Serna, J.M. & Macias, D. (2005). Incidental catch and estimated discards of pelagic sharks from the swordfish and tuna fisheries in the Mediterranean Sea. Fishery Bulletin, 103, 620-634.
• Serena, F. (2005). Field identification guide to the sharks and rays of the Mediterranean and Black Sea. FAO Species Identification Guide for Fishery Purposes. Rome: FAO. 97.
• Sims, D., Fowler, S.L., Ferretti, F. & Stevens, J. (2016). Prionace glauca. The IUCN Red List of Threatened Species 2016: e.T39381A16553182. Downloaded on 27 May 2020.