Study of the effect of Estonian and aqueous extract of Persian walnut tree leaf (Juglans regia) on growth indicators in western white shrimp farmed (Litopenaeus vannamei)

The aim of this study was to investigate the effects of Estonian and aqueous extracts of Persian walnut leaves on the performance of growth indices in western white shrimp (Litopenaeus vannamei). Materials and methods included 6 treatments of shrimp with different concentrations of 100, 200 and 300 mg/kg aqueous and Estonian extracts of Persian walnut leaves in the diet and 2 negative control treatments and 2 positive control treatments were randomly tested over a period of 40 days. They got Biometrics of stored shrimp were measured for the performance of growth indices.The results showed that the addition of extracts significantly increased protein efficiency in the treatment groups compared to the positive control group (p≥0.05). Addition of aqueous and Estonian extracts of Persian walnut leaves to the diet showed that the extracts had a positive effect on food conversion index on days 20 and 40 of the study (p≥0.05); And this effect is more in Estonian extract than aqueous extract (p ≥ 0.05). The results showed that in the two indices of weight and length in aqueous and Estonian extracts compared to the control groups showed a significant increase (p ≥ 0.05) but no significant difference was observed in the carapace length index among all treatments (p ≥). In the survival index, studies show that at the end of day 11, aqueous and Estonian extracts of 100 mg / kg had a significant positive control compared to the other groups, which shows that these extracts caused more survival of shrimp (p≥0.05).