Effect of Different Levels of Dietary Calcium and Potassium on Growth Indices, Biochemical composition and Some Whole Body Minerals in Rainbow Trout (Oncorhynchus Mykiss) Fingerlings

Two completely randomized experimental designs were conducted to investigate the effect of different levels of dietary Ca (0.95%, 1.21 %, 1.41 % and 1.61 %) and Kappa (0.72%, 0.9%, 1.1% and 1.3%) on some growth indices, body biochemical composition and some whole body elements in rainbow trout fingerlings in a culture system. Tow basic diets with 0.95% Ca and 0.72% Kappa were prepared and with CaC03 for experiment I and K,C03 for experiment II, other dietary treatments were built. In initiation of each experiments, 25 pieces of rainbow trout fingerlings (12.18 plus or minus 0.04 and 15.60 plus or minus 0.05) introduced in each experimental units respectively, and were fed with dietary treatment ad libitum two times daily at 9:00 and 15:00 for a 8 week period. It was resulted that different levels of inorganic dietary-Ca in diets, had not significantly affected on growth factors (W1, WG, G%, SGR% day1 and TGC), but different levels of inorganic dietary-K in diet had significantly affected (p