Some morphometric and biological characteristics of the marbled electric ray, Torpedo marmorata, in the Marmara Sea

Some morphometric and biological characteristics of the marbled electric ray, Torpedo marmorata, in the Marmara Sea

Yusuf Şen, İsmail Burak Daban, Cahide Çiğdem Yığın

ORCID IDs: Y.Ş. 0000-0002-0595-4618; İ.B.D. 0000-0002-2973-5698; C.Ç.Y. 0000-0002-8808-2252

Department of Marine Biology, Faculty of Marine Science and Technology, Çanakkale Onsekiz Mart University, 17200, Çanakkale, TÜRKİYE
Department of Fisheries and Processing Technology, Faculty of Marine Science and Technology, Çanakkale Onsekiz Mart University, 17200, Çanakkale, TÜRKİYE

Abstract 

A total of thirty-one adult individuals and four embryos of Torpedo marmorata Risso, 1810 were caught as bycatch with trammel nets by commercial fishermen in the southwestern Sea of Marmara, Türkiye. The length-weight relationships (LWRs), length-length relationships and some biological properties of the individuals were investigated. The LWRs for males, females, and all sexes were estimated as TW=0.0152TL^3.0437, TW=0.0129TL^3.1029 and TW=0.0124TL^3.1122 (TW: Total weight, TL: Total length), respectively. The growth type was identified as isometric for males, females, and all sexes. According to morphometric measurements, only difference was between total length and disc length ratios of female and male individuals. The minimum, maximum and mean condition factors were estimated for adults as 1.493, 2.179 and 1.801±0.03, respectively. These results increase the knowledge on T. marmorata stocks distributed in the Sea of Marmara and expected to contribute for future studies on the species.

Keywords: Electric rays, growth type, Sea of Marmara, condition factor

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