Diet composition of Cyprinion watsoni (Day, 1872) in the Marm Cascade (Hormozgan Province)

This study was conducted to determine the diet composition of Cyprinion watsoni in the Marm Cascade of Hormozgan province for period 16 months from June 2017 to September 2018. Sampling was done by hand nets. A total of 392 C. watsoni were measured biometric data and then dissected for diet determination. The results showed that these fish were herbivores, with a rate of %98.8. The results of abundance of food items revealed that the major food groups in C. watsoni were diatoms (Bacillariophyta) with %92.67, Cyanophyta with %5.34 and golden yellow algae, respectively. (Chrysophyta) with %0.28, Green Algae (Chlorphyta) with %0.29 and crustacea with %0.04, Mollusca with %0.04 and Foraminofera (%0.01) are other food items that observed in gut diet. Also unknown food group was %1. The results of the dietary preference index showed that diatoms as main food and food items included green algae, golden yellow algae, crustaceans, molluscs and foraminifera as random foods in this fish diet.