The effect of using different levels of olive pomace on growth performance and hematological indices of goldfish (Carassius auratus)
The aim of this study was to determine the use of olive pomace in the diet and effect on growth performance and blood parameters in goldfish (Carassius auratus). Fish with average weight of 13.73 ± 0.03 g were fed for 8 weeks with five diets including controll diets without olive pomace and diets containing 2, 4, 6 and 8% dry and alcoholated olive oil. Finally, blood samples were taken from caudal vein and hematological indices including red (RBC) and white blood cells (WBC), differential count of WBC, hemoglobin, hematocrit, mean corpuscular volume, mean corpuscular hemoglobin, mean corpuscular hemoglobin concentration were determined. Based on the results, fish were fed by the diet supplemented with 2 percent olive pomace displayed significant difference in final weight, weight gain, specific growth rate, body weight increase, condition factor, protein efficiency ratio and lipid efficiency ratio (P<0.05), while dietary olive pomac had no effects on the final length and feed conversion ratio of goldfish fed different diets (P>0.05). Differences among treatments in all hematological indices were not significant (P>0.05). According to the results of this study, the use of olive pomace in goldfish diet up to 2% is suggested.
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