Effect of different levels of salinity on growth indices, survival rate, food consumption and blood parameters in Rutilus frisii kutum (kamensky, 1901) fingerlings

In this study, the effects of salinity (0, 2, 4, 7 and 10 ppt) on growth, survival, food consumption and blood biochemistry parameters of Rutilus frisii kutum fingerlings (initial mean weight 0.22±0.02 g) during 60 days were investigated. Weight gain (WG) and daily growth rate (DGR) were significantly influenced by water salinity (P<0.05), but specific growth rate (SGR), food conversion ratio (FCR), condition factor (CF) and percentage weight gain (%WG) of fingerlings did not significan differences among treatments at the end of the experimental period (P>0.05). Results indicated that highest weight gain (WG), specific growth rate (SGR) and percentage weight gain (%WG) of fingerlings obtained at 4 ppt and lowest of this indices were at 10 ppt. Maximum and minimum of specific growth rate (SGR) and condition factor (CF) of fingerlings reported at 2 ppt and 10 ppt, respectively. The best food conversion ratio (FCR) was observed at 2 ppt. The fingerlings that reared at 10 ppt, showed the slower growth and food consumption. Also, in the present trail some blood biochemistry parameters of fingerlings (hematocrit, glucose, cholesterol, total protein, calcium, magnesium, sodium and potassium) measured at the end of the experimental period. Results of blood biochemistry parameters showed no significant variation among different treatments (P>0.05). In addition, this research suggested that fingerlings of kutum reared excellency at saline water until 7 ppt.