blood parameters of caspian brown trout (salmo trutta caspius) fingerlings affected by dietary l-ascorbyl-2-polyphosphate

This study was aimed to evaluate the effect of l-ascorbyl-2-polyphosphate as a dietary ascorbic acid source on blood parameters of caspian brown trout (salmo trutta caspius), including red blood cell (rbc) count, white blood cell (wbc) and wbc differential. a total number of 600 caspian brown trout (9.6±0.6 g) fingerlings were randomly distributed in triplicates among five treatments each containing 40 specimens. experimental diets were also prepared by adding 0, 50, 100, 200 and 400 mg kg-1 l-ascorbyl-2-polyphosphate to the basal diet. feeding was done for nine weeks in each treatment. the survival rate in all treatments was 100%. the results showed a significant increase in rbc, hemoglobin, hematocrit, wbc and lymphocyte (p < 0.05) by supplementing l-ascorbyl-2-polyphosphate compared to the control treatment. the fish fed by 200 mg ascorbic acid kg-1 diet had the maximum hemoglobin and hematocrit in comparison with the other treatments. the current research showed that dietary l-ascorbyl-2-polyphosphate influences the complete blood count of caspian brown trout while fingerlings fed with the optimum amounts of 200 mg ascorbic acid kg-1 diet for a period of 9 weeks trail.