The Effect of different levels of Natural Zeolite on growth indices of juvenile Caspian frisii Kutum (Rutilus frisii kutum, Kamenskii, 1901)

The influence of Natural zeolite (Clinoptiliolite) as anti-bacteria and anti-fungus in the digestive system and also as a anti-toxin in the diet and reduction of radioactive in human, animals and aquatic animals like trout has been proved. Since the role of Natural zeolite in the diet of kutum (rutilius frissi kutum) has not yet researched, There fone an experi ment of 60 days durantion in wet lob of Guilan university has leen done. (0,1,2,3,4 % level of zeolit). Three hundred juvenile kutum with an average weight of 2.2+0.32 gr were randomly distributed between 15 fiber glass tanks of 500 Iit capacities which were filled with 400 Iit fresh and filtered water. Nutitonal responses in term of weight gain (WG) specific growth rate (SGR) food conversion ratio (FCR) and survival rate (SR) were considerably improved in treatment five with 4% zeolite indieet and showed significant differences with other treatments (P<0.50). Growth indices in treatments having zeolit indiets were significantly better as compared with control diets (nonzeolite) (P<0.05). Fisj body composition (carcass) in all treatments were not showed touchable significant (P<0.05). The influence of zeolile as feed additive in kutum diet with 4% level has positine effect on growth indices of fish.