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

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), lengthlength relationships and some biological properties of the individuals were investigated. The LWRs for males, females, and all sexes were estimated as TW=0.0152TL3.0437, TW=0.0129TL3.1029 and TW=0.0124TL3.1122 (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. [ABSTRACT FROM AUTHOR]