A study on age and growth of juvenile and semi adult Torpedo nobiliana Bonaparte, 1835 inhabiting Iskenderun Bay, northeastern Mediterranean Sea



In this study, age and growth of juvenile and semi adult Atlantic electric ray were reported for the first time and safranin-o method was also used to stain sectioned vertebrea of this species. A total of 93 Torpedo nobiliana that are 12.0 to 35.5 cm were collected as by- catch by trawl fishermen between September 2010 and December 2011. There was no adult specimen. Of the juvenile and semi adult 42% was female and 58% was male. It was identified that population dispersed from 1 to 5 age groups. The length and weight relationship was expressed as W=0.0151×L3.0611 for combined sexes. The growth parameters of the von-Bertalanffy equations were: L=74.47 cm TL, K=0.1089 year-1 and to=-1.058 year-1. Age and growth characteristics of juvenile and semi adult Atlantic electric ray were found out first time with this study.


Electric ray, Aging method, Growth, Safranin-o, Mediterranean Sea.

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Abdel-Aziz S.H. 1994. Observations on the biology of the common torpedo (Torpedo torpedo, Linnaeus, 1758) and marbled electric ray (Torpedo marmorata Risso, 1810) from Egyptian Mediterranean waters. Australian Journal of Marine and Freshwater Research, 45 (4): 693-704.

Abdul Malak D., Livingstone S.R., Pollard D., Polidoro B.A., Cuttelod A., Bariche M., Bilecenoglu M., Carpenter K.E., Collette B.B., Francour P., Goren M., Kara M.H., Massuti E., Papaconstantinou C., Leonardo Tunesi L. 2011. Overview of the conservation status of the marine fishes of the Mediterranean Sea. Gland, Switzerland and Malaga, Spain: IUCN. 61 p.

Bagenal T.B., Tesch F.W. 1978. Age and growth, In Methods for Assessment of Fish Production in Freshwaters, Bagenal, T.B. (Ed.). Blackwell Scientific Publications, Oxford, UK. pp: 101-136.

Baino R., Serena F., Ragonese S., Rey J., Rinelli P. 2001. Catch composition and abundance of elasmobranches based on the MEDITS program. (Composizione specifica ed abbondanza dei pesci cartilaginei nelle campagne MEDITS). Rapport Committee International de la Mer Méditerranée, 36: 234.

Başusta A., Basusta N., Sulikowski J.A., Driggers III W.B., Demirhan S.A., Cicek E. 2012b. Length-weight relationships for nine species of batoids from the Iskenderun Bay, Turkey. Journal of Applied Ichthyology, 28: 850-851.

Başusta A., Ozer E.I., Sulikowski J. A., Başusta N. 2012a. First record of a gravid female and neonate of the Lusitanian cownose ray, Rhinoptera marginata, from the eastern Mediterranean Sea. Journal of Applied Ichthyology, 28: 643-644.

Başusta N. 2002. Occurrence of a Sawback Angelshark (Squatina aculeata Cuvier, 1829) off the Eastern Mediterranean Coast of Turkey. Turkish Journal of Veterinary and Animal Sciences, 26: 1177-1179.

Başusta N., Demirhan, S.A., Çiçek E., Başusta A., Kuleli T. 2008. Age and growth of the common guitarfish, Rhinobatos rhinobatos (Linnaeus, 1758), in Iskenderun Bay (northeastern Mediterranean, Turkey). Journal of Marine Biological Association of the United Kingdom, 88(4): 837-842.

Başusta N., Erdem U. 2000. A study on the pelagic and demersal fishes in Iskenderun Bay. Turkish Journal of Zoology, 24: 1-19.

Başusta N., Erdem U., Kumlu M. 1998. Two New Fish Records for the Turkish Seas: Round Stingray Taeniura grabata and Skate stingray Himantura uarnak (Dasyatidae). Israel Journal of Zoology, 44: 65-66.

Başusta N., Sulikowski J.A. 2012. The oldest estimated age for roughtail stingray (Dasyatis Centroura; Mitchill, 1815) from the Mediterranean Sea. Journal of Applied Ichthyolog, 28: 641-642.

Beamish R.J., Fournier D.A. 1981. A method for comparing the precision of a set of age determinations. Canadian Journal of Fisheries and Aquatic Sciences, 38: 982-983.

Bigelow H.B., Schroeder W.C. 1953. Sharks. In: Fishes of the Western North Atlantic. Mem. Sears. Fnd. Mar. Res., 1(1): 1-588.

Bircan-Yildirim Y., Çek Ş., Başusta N., Atik E. 2011. Histology and morphology of the epigonal organ with special reference to the Lymphomyeloid system in Rhinobatos rhinobatos. Turkish Journal of Fisheries and Aquatic Science, 11: 351-358.

Campana S.E. 2001. Accuracy, precision and quality control in age determination, including a review of the use and abuse of age validation methods. Journal of Fish Biology, 59: 197-242.

Capapé C., Desoutter M. 1980. Nouvelles descriptions de Torpedo (Torpedo) nobiliana Bonaparte, 1835 et de Torpedo (Torpedo) mackayana Metzelaar, 1919. Bulletin du Muséum national d'histoire naturelle, Paris, 4ème série, 2 ème section, A1: 325-342.

Capapé C., Guélorget O., Vergne Y., Marquès A., Quignard J.P. 2006a. Skates and rays (Chondrichthyes) from waters off the Languedocian coast (southern France, northern Mediterranean). Annales, Series Historia Naturalis, 16(2): 166-178.

Capapé C., Guélorget O., Vergne Y., Quignard J.P., Ben Amor M.M., Bradai M.N. 2006b. Biological observations on the black Torpedo, Torpedo nobiliana Bonaparte 1835 (Chondrichthyes: Torpedinidae), from two Mediterranean areas. Annales, Series Historia Naturalis, 16(1): 19-28.

Çek Ş., Başusta N., Demirhan S.A., Karalar M. 2009. Biological observations on the common guitarfish (Rhinobatos rhinobatos Linnaeus 1758) from Iskenderun Bay. Animal Biology, 59: 211-230.

Chang W.Y.B. 1982. A statistical method for evaluating the reproducibility of age determination. Canadian Journal of Fisheries and Aquatic Sciences, 39: 1208-1210.

Duman O.V., Başusta N. 2013. Age and growth characteristics of marbled electric ray Torpedo marmorata (Risso, 1810) inhabiting Iskenderun Bay, North-eastern Mediterranean Sea. Turkish Journal of Fisheries and Aquatic Science, 13: 551-559.

Golani D., Ozturk B., Başusta N. 2006. Fishes of the Eastern Mediterranean. Turkish Marine Research Foundation, Istanbul, Turkey. Pub. Number: 24, pp: 259.

Hoff T.B., Musick J.A. 1990. Western North Atlantic shark-fishery management problems and informational requirements. In: H.L. Pratt, Jr., S.H. Gruber, T. Taniuchi (eds). Elasmobranchs as living resources: advances in the biology, ecology, systematics, and the status of fisheries. U.S. Department of Commerce, NOAA Technical Report NMFS 90. Pp: 455-472.

Ismen A. 2003. Age, growth, reproduction and food of common stingray (Dasyatis pastinaca L.1758) in Iskenderun Bay, the eastern Mediterranean Sea. Fisheries Research, 60: 169-176.

Kahveci Z., Minbay F.Z., Cavusoglu L. 2000. Safranin O staining using a microwave oven. Biotechnic and Histochemistry, 75(6): 264-8.

Labropoulou M., Papaconstantinou C. 2000. Community structure of deep-sea demersal fish in the North Aegean Sea (northeastern Mediterranean). Hydrobiologia, 440: 281-296.

Macpherson E., Duarte C.M. 1991. Bathymetric trends in demersal fish size: is there a general relationship? Marine Ecology Progress Series, 71: 103-112.

McEachran J.D., Carvalho M. 2002. Torpedinidae. In: The living marine resources of the Western Central Atlantic Vol. 1 (ed.) Kent E. Carpenter. FAO, Rome. pp: 515-517.

McFarlane G.A., King J.R. 2006. Age and growth of big skate (Raja binoculata) and longnose skate (Raja rhina) in British Columbia waters. Fisheries Research, 78: 169-178.

Ricker W.E. 1968. Methods for Assessment of fish production in fresh waters. IBP 236 Handbook No. 3. F.A. Davis, Philadelphia, Pennsylvania, 328 pp: 237

Sulikowski J.A., Morin M.D., Suk S.H., Howel W.H., 2003. Age and growth of the winter skate (Leucoraja ocellata) in the western Gulf of Maine. Fishery Bulletin, 101: 405-413.

Tirasin E.M. 1993. Balık populasyonlarının büyüme parametrelerinin araştırılması. Turkish Journal of Zoology, 17: 29-82.

Tran D., Golick M., Rabinovitz H., Rivlin D., Elgart G., Nordlow B. 2000. Hematoxylin and safranin O staining of frozen sections. Dermatologic Surgery, 26(3): 197-9.

Turkmen M., Basusta N., Demirhan S.A. 2005. Ageing in fish. In: Karatas M. (ed.). Research techniques in fish biology. Ankara, Turkey: Nobel Publications. pp: 121-148.

von Bertalanffy, L. 1938. A quantitative theory of organic growth. Human Biology, 10, 181-213.

Whitehead P.J.P., Bauchot M.L., Hureau J.C., Nielsen J., Tortonase E. 1984. Fishes of the North-eastern Atlantic and the Mediterranean Vol 1. UNESCO, Paris.

Yeldan H., Avsar D., Manaşırlı M. 2009. Age, growth and feeding of the common stingray (Dasyatis pastinaca, L., 1758) in the cilisian coastal basin, northeastern Mediterranean Sea. Journal of Applied Ichthyology, 25: 98-102.


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