Evaluation of growth, immunity and blood serum hematology indicators in the diet of rainbow trout fingerling (Oncorhynchus mykiss) based on locust meal (Locusta migratoria)

In this study, the possibility of using migratory locust as a source of protein in the diet of rainbow trout fry and its effect on growth performance, immunity and hematology of blood serum was investigated. 300 number of rainbow trout fingerling with an average weight (6.09 ± 0.22 gr) with diets of 0% (control), 15% (LM15), 30% (LM30) and 60% (LM60) of formulated locust meal. became Each diet was distributed in a completely random design in 3 replicates with 30 number of fish in each fiberglass tank with the same conditions. At the end of the experiment, the indicators of growth, immunity and blood serum hematology were calculated based on standard formulas and analyzed using Tukey's test. The results showed that the highest final weight was observed in the 30% treatment (616.20% ± 34.89%) and the difference between zero, 15% and 60% treatments was significant (p<0.05). In the 60% treatment, a significant increase in feed conversion ratio was observed compared to the control treatment (p < 0.05). In feeding fish with a diet containing locust meal, the values of glucose, albumin, globin and IgM did not show significant differences among different experimental treatments (p<0.05). However, the amount of total protein, triglyceride and blood cholesterol showed a significant difference in the experimental treatments compared to the control treatment (p < 0.05). Therefore, it can be concluded that the use of 30% of locust meal in the commercial diet of rainbow trout fingerling can improve the growth performance and have no negative effect on the desired level of blood and immune parameters..