EFFECTS OF ZEOLITE (Clinoptilolite) ON SOME WATER AND GROWTH PARAMETERS OF RAINBOW TROUT (Oncorhynchus mykiss WALBAUM, 1792)

The effects of zeolite (Clinoptilolite (CL)) added into pond water, on some water and growth parameters of rainbow trout (Oncorhynchus mykiss Walbaum, 1792), were investigated, in the present study. CL was added into water by 0 (control), 1, 2, 3 mg l(-1) rates and carried out in 100 days. The results of the study showed that average body weights of fish in group were respectively, 128.242 +/- 4.748 g, 126.623 +/- 5.545 g, 126.349 +/- 0.339 g and 126.556 +/- 7.663 g and average total lengths were 21.870 +/- 0.355 cm, 21.340 +/- 0.341 cm, 21.783 +/- 0.255 cm and 21.191 +/- 0.193 cm. However, there was no statistical difference among groups for all parameters (P>0.05). At the end of the study, there was no statistical difference among groups for water parameters (P>0.05), but an obvious decreasing was observed in nitrate rates during study and in ammonium and nitrite rates during only first period.