The study of feeding behavior of Rutilus frisii kutum to stimulant taste substances

The purpose of this study was to study of the behavioral responses of Rutilus frisii kutum to various concentrations of stimulant taste substances. 20 fish with average weight 1.5 ± 0.5g placed in individual aquarium with a volume of 5 liters. After the fish adapted to laboratory conditions, we investigated their behavioral responses to different concentrations of taste materials (Acid citric, Calcium chloride, Sodium chloride, Sucrose), control and extract of chironomid. During the first minute of experiments Granules containing the mentioned materials were given to the fish and the behavior of fish was recorded by a camera. Taste preferences were determined according to behavioral responses of fish to granules. None of the concentrations of acid citric was deterrent. Concentration of 0.026 M was most attractive with 48.49±7.1 of consumption and attractiveness index 59.87±9. Percent of consumption and attractiveness index of Sodium chloride in all concentrations were not statistically significant compare to control treatment (P>0.05). Percent of consumption and attractiveness index of Sucrose was more than those of Sodium chloride and Calcium chloride. The number of grasps in concentration of basic (10%) Sucrose, Sodium chloride and Calcium chloride was statistically significant compare to control treatment (P<0.05). There was a positive correlation between the attractiveness index and retention times in the mouth but not for number of grasps. The results of the present study can be applicable for feeding and providing suitable and appropriate diets consistent with taste preferences for this species.