A preliminary study on length-weigth relationships for seven elasmobranch species from North Aegean Sea,Turkey

Kuzey Ege'de yedi Elasmobranş türünün boy-ağırlık ilişkileri. Bu çalışmada, Kuzey Ege Denizi'nden örneklenen yedi elasmobranş türünün boy-ağırlık ilişkileri incelenmiştir. $WT=a(TL)^b$ , şeklinde ifade edilen denklem her tür için hesaplanmıştır. Bu denklem, Scyliorhinus canicula için, $WT= 0.0016TL^{3.1804}$ ($r^2$ = 0.9795), Mustelus mustelus için, $WT= 0.0008TL^{3.3259}$ ($r^2$ = 0.9745), Squalus acanthias için, $WT=0.0031TL^{3.1056}$ ($r^2$ = 0.9814), Torpedo marmorata için, $WT= 0.0488TL^{2.6935}$ ($r^2$ =0.9584), Raja. clavata için, $WT= 0.0016TL^{3.2914}$ ($r^2$ = 0.9337), Dasyatispastinaca için, $WT= 0.0085TL^{2.9379}$ ($r^2$ = 0.9687) ve Raja miraletus için, $WT= 0.0001TL^{4.0173}$ ($r^2$ = 0.9251) olarak bulunmuştur. Ayrıca bu denklem her iki eşey için de hesaplanmıştır. Türlerin Min., Maks. ve Ortalama boylan ile ağırlıktan tablolar halinde sunulmuştur.

Anahtar Kelimeler:

Chondrichthyes, Türkiye, Ege Denizi, balıkçılık, uzunluk-ağırlık oranı, cinsiyet

Kuzey Ege'de yedi elasmobranş türünün boy-ağırlık ilişkileri

In this study, length-weight relationships of seven elasmobranch species sampled - from North Aegean Sea are examined. An equation expressed as $WT=a(TL)^b$ was calculated for each species. It was calculated as $WT= 0.0016TL^{3.1804}$ ($r^2$ = 0.9795) for Scyliorhinus canicula, $WT= 0.0008TL^{3.3259}$ ($r^2 $ =0.9745) for Mustelus mustelus, $WT=0.0031TL^{3.1056}$ ($r^2$ =0.9814) for Squalus acanthias, $WT= 0.0488TL^{2.6935}$ ($r^2$ = 0.9584) for Torpedo marmorata,$WT= 0.0016TL^{3.2914}$ ($r^2$ = 0.9337) for Raja, clavata, WT= $WT= 0.0085TL^{2.9379}$ ($r^2$ = 0.9687) for Dasyatis pastinaca, and WT= $WT= 0.0001TL^{4.0173}$ ($r^2$ = 0.9251) for Raja miraletus. In addition, this equation was determined for both sexes. Lengths and weights of species (mean, maximum and minimum) were given in tables.

Keywords:

Chondrichthyes, Turkey, Aegean Sea, fisheries, height-weight ratio, sex,

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Avsar, D. 1996. Sex, Age and Growth of the Spurdog (Squalus acanthias, L., 1758) in the Southeastern Black Sea. Yugoslav Jour. of Operations Research 6 (1996), Number 2, 295-304. -2001. Age, Growth, Reproduction and Feeding of the Spurdog (Squalus acanthiasLinnaeus, 1758) in the South-eastern Black Sea. Estuarine, Coastal and Shelf Science, 52, 269-278.

Bilecenoğlu M., E. Taskavak, S. Mater and M. Kaya. 2002. Checklist of the marine fishes of Turkey. Zootaxa, 113: 1-194.

Bonfil, R. 1994. Overview of World Elasmobranch Fisheries. FAO Tech. Paper, No: 341, Rome, 119 p.

Cailliet, G. M., and D. W. Bedford. 1983. The biology of three pelagic sharks from California waters, and their emerging fisheries: a review. CalCOFI Rep., Vol. XXIV, pages 57-69.

Cailliet, G. M., D.B. Holts, and D. Bedford. 1991. A review of the Commercial Fisheries for Sharks on the West Coast of United States. Shark Conservation: Proceedings of an International Workshop on the Conservation of Elasmobranchs, edited by J. Pepperell, J. West and P. Won, pp. 13-29, Conservation Research Centre, Sydney, Australia.

Cihangir, B., A. Ünlüoğlu and E. Mümtaz Tıraşın. 1997. Distribution and some biological aspects of the lesser spotted dogfish (Chondrichthyes, Scyliorhinus canicula, L., 1758) from the northern Aegean Sea (in Turkish). Akdeniz Balıkçılık Kongresi, 9-11 Nisan-İzmir, pp. 585-603.

Cortes, E. 2000. Life History Patterns and Correlations in Sharks. Reviews in Fisheries Science, 8(4): 299-344.

Düzgüneş, E., N. S. Başçınar, H. Emral, S. Kutlu and M. Tanrıverdi. 1999. A preliminary study on the some population parameters of the thornback ray (Raja clavata L., 1758) in the east Black Sea (in Turkish). in X. Ulusal Su Ürünleri Sempozyumu 22-24 Eylül/ADANA. Sayfa 430-439.

Ellis, J. R., B. B. Rackham and S. I. Rogers. 2002. The distribution of chondrichthyan fishes around the British Isles and their conservation status. In Northwest Atlantic Fisheries Organization. NAFO SCR Doc. 02/101, Serial No. N4722, 7 pages.

Erdem, Y., S. Özdemir, and Ç. Sümer. 2001. A study of stomach contents of thornback ray (Raja clavata L.) (in Turkish). XI. Ulusal Su Ürünleri Sempozyumu, Hatay, 2001, sayfa 351-359.

Filiz, H. and M. Togulga. 2002. Commercial Elasmobranch Species in Turkey’s waters, their Fisheries and Management (in Turkish). In Türkiye’nin Kıyı ve Deniz Alanları IV. Ulusal Konferansı Bildiriler Kitabı (eds., E. Özhan ve N. Alpaslan), Cilt 2, sayfa: 717-727, 5-8 Kasım 2002, İzmir, Türkiye.

Frisk, G. M., T. J. Miller, and M. J. Fogarty. 2001. Estimation and analysis of biological parameters in elasmobranch fishes: a comparative life history study. Canadian Jour. of Fisheries and Aqu. Sci. Vol. 58, No. 5, pages 969-981.

Froese, R. and Pauly, D. (Ed.). 2000. Fishbase World Wide Web electronic publications. www.fishbase.org, 20 Sept. 2000. 2003. Fishbase World Wide Web electronic publications. www.fishbase.org, 10 January 2003.

Heessen, H. L. J. 2002. Development of the Elasmobranch Assesment (DELASS). InNorthwest Atlantic Fisheries Organization. NAFO SCR Doc. 02/112, Serial No. N4733, 4 pages.

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

Jones, B. C., and Geen, G. H. 1977. Age and growth of spiny dogfish (Squalus acanthias) in the Strait of Georgia, British Columbia. Research and Development Technical report. Fisheries and Marine Service, no. 699, 16 pp.

Kohler, N. E., J. G. Casey, and P. A. Turner. 1996. Length-Length and Length-Weight Relationships for 13 Shark Species from the Western North Atlantic. NOAA Technical Memorandum NMFS-NE-110, 22 p.

Kutaygil, N. and N. Bilecik. 1998. Studies on a shark species, picked dogfish (Squalus acanthias L.) distrubuted along the Anatolian littoral zones in the Black Sea (in Turkish). TC. Tarım ve Köyişleri Bak. Su Ürünleri Araş. Enst. Yayını, No. 2, Bodrum, 71 sayfa

Mollet, H. F., and G. M. Cailliet. 1996. Using Allometry to Predict Body Mass from Linear Measurements of the White Shark. In Great White Sharks, The Biology of Carcharodon carcharias (eds. A. P. Klimley, and D. G. Ainley). Academic Press, p. 81-89.

Oray, A. S. 1989. A Preliminary Study on the Biology of some Shark and Ray species in Aegean Sea (in Turkish). Yüksek Lisans Tezi, D.E.Ü. Deniz Bil. Enst., 47 s., İzmir.

Prince, J. D. 2002. Gauntlet Fisheries for Elasmobranchs - the secret of Sustainable Shark Fisheries. In Northwest Atlantic Fisheries Organization. NAFO SCR Doc. 02/139, Serial No. N4761, 16 pages.

Samsun, O., N. Polat and A. Gümüş. 1995. Research on the some length-weight characteristics of spiny dogfish (Squalus acanthias L., 1758) caught in the mid of the Turkish Black Sea region (in Turkish). Su Ürünleri Dergisi, Cilt No:12, Sayı: 1-2, Bornova-İzmir, sayfa 27-35.

Soldat, V. T. 2002. Spiny dogfish (Squalus acanthias L) of the Nortwest Atlantic Ocean (NWA). In Northwest Atlantic Fisheries Organization. NAFO SCR Doc. 02/84, Serial No. N4703, 33 pages.

Tıraşın, E. M. 1993. Investigation of growth parameters of fish populations (in Turkish). Doğa Tr. J. Zool. 17:29-82