Morphometric relationships and growth of common stingray, Dasyatis pastinaca (Linnaeus, 1758) and marbled stingray, Dasyatis marmorata (Steindachner, 1892) in the northeastern Levantine Basin

Hacer Yeldan, Sedat Gündoğdu

Faculty of Fisheries, Çukurova University, Balcalı Campus, Adana, 01330, TURKEY

Abstract

In this study, we determined the relationships between seven morphometric characters of common stingray (Dasyatis pastinaca) and the marbled stingray (Dasyatis marmorata) from the Northeast Levantine coast of Turkey. A total of 215 samples were obtained by monthly bottom-total weight (TW), disc length (DL), disc width (DW), nose-eye (NE), mouth-width (MW) and nose-mouth (NM) were measured and, analyzed and their relationships were statistically evaluated. In general, the relationships between all the body proportions were highly statistically significant (p<0.05), as is usual between body proportions. The length and weight value for D. pastinaca and D. marmorata were calculated as 14.5-56.4cm and 74.5-5740.0g, and 9.9-41.5cm and 78.98-4500.0g, respectively. The relationships were determined by TW=0.039*DW2.93 and TW=0.002*TL3.32 for D. pastinaca and; TW=0.048*DW2.94 and TW=0.012*TL2.74 for D. marmorata. Length-weight relationships show allometric growth (b=3.31 for D. pastinaca and 2.74 for D. marmorata). Estimates of the von Bertalanffy growth parameters indicate disc width DW∞=58.28cm, k=0.06 year-1, to=-0.213year for the combined sexes of D. pastinaca; DW∞=46.09cm, k=0.36year-1, to=-0.162year for all individuals of D. marmorata.

Keywords: Dasyatis pastinaca, Dasyatis marmorata, morphometric, length-weight relationships, growth

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