Municipal and industrial wastewaters, discharging into the water, surface runoff as results of raining and eroded material as well as algae, are the most common causes of turbidity in the water. Turbidity can be harmful to the aquatic animals through various ways such as preventing the development of fish eggs and larvae growth, changes in preying procedures, reducing the amount of available food and visual ability of predators. For this purpose, the fishes were captured from the Gavkhoni Wetland (Shakh-Kenar Dam) using a net with 0.2 mm mesh size. During the acclimation procedure, Daphnia magna were cultured as bait. Afterward, the lethal concentration for turbidity was examined. Then, 20 treatments, including 8 fishes in each treatment were selected as below: Group A included 1 fish and 5 indivisual Daphnia, group B included 1 fish and 10 indivisual Daphnia, group C included 2 fish and 5 indivisual Daphnia, group D included 2 fish and 10 indivisual Daphnia. Then, the prey eating by fish in control of each above-mentioned group was recorded by CCD camera. Additionally, the survival of the prey in different turbidities (5-1000 NTU) was determined. Moreover, the fish predation was tested in the range of 200-800 NTU and turbidity levels were recorded in which the fish feeding was stopped. Finally, the effect of turbidity, prey and predator densities on predation of fish was investigated. Five different levels of turbidity, including 0 (control), 5, 10, 50 and 150 NTU were designed for each mentioned group. To perform that, the fish was starved for 24 hours before the experiment was commenced. All fish were acclimated for 15 minutes with turbid water and then the necessary number of preys was carefully introduced into experimental arena. At the end of experimental time, each water treatment was filtered and then the number of remained prey(s) was counted. Finally, some samples of eyes tissues were fixed and stained by the use of H E method. The results show significant effect of turbidity on the prey eating of A. isfahanensis (p 0.05). Prey's eating was reduced by 71, 75, 43 and 53% in turbidity of 150 NTU in A, B, C and D group as compared with control respectively. On the other hand, by comparing B and D group, it was observed that by the increase in number of predators, the percentage of prey eating was significantly elevated in all levels of turbidity (p 0.05). The increase in the number of prey consumption in the above-mentioned turbidities was 26, 29, 18 and 20% respectively. In addition, by comparing C and A groups, it was observed that by the increase of predators, the percentage of prey eating was significantly raised in all levels of turbidities (p 0.05). The increase of prey consumption in the mentioned turbidities was 37, 33, 22 and 27% respectively. By comparing A and B groups, it could be observed that the increasing in the density of preys did not have any significant effect on the percentage of eating preys in all levels of turbidity (5, 10, 50, 150 NTU) (p 0.05). On the other hand, it could be observed that there is no significant difference in prey consumptions between C and D groups (in all turbidity levels). The eye histology indicated that there is no structure adaptation of eyes to turbid waters. According to obtained results, it seems that by increasing in turbidity levels, less contrast can be observed between the prey and background. Indeed, it causes the disruption in hunting procedure and therefore, it lowered the feeding rate of A.isfahanensis . Key words: Turbidity, Predation, Prey density and predator, Eye Histology, Aphanius isfahanensis