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A study was conducted in complete randomized design (CRD) to evaluate the dietary inclusion rate of Stinging nettle (Urtica parviflora) on growth and immune responses of rainbow trout fry. There were four treatments having 4 diets with control (T1), 1% (T2), 2% (T3) and 3% (T4) of stinging nettle incorporated in the diet. The treatth th th ments were replicated four times. The experiment was conducted for 90 days from 20 June-17 September,2018. Total harvest weight of fish in T4 (315.95±8.11 g) was significantly higher and different than T3 (291.3±1.98 g), T2 (282.4±0.92 g) and T1 (260.05±5.72 g). The highest specific growth rate (SGR) was seen in treatment T4 (1.77 ±0.04) which was not significantly different with T3 (1.71±0.016) but was significantly different with T2 (1.65 ±0.034) and T1 (1.52±0.037). The lowest food conversion ratio (FCR) was seen in T4 (2.38±0.07) which was not significantly different with T3 (2.56±0.03) but was significantly different than T2 (2.72±0.08) and T1 (2.99± 0.02). Similarly, the highest protein efficiency ratio (PER) was seen in treatment T4 (0.94±0.05) which was not significantly different with T3 (0.87± th 0.018) but was significantly different than T2 (0.82±0.04) and T1 (0.74±0.007). After 90 days of culture period the cortisol level (mg/ml) were lower in the group fed with 3% of the plant additives. The treatment T4 (0.17± 0.01) had significantly lower level of cortisol with T3 (0.295±0.04), T2 (0.38±0.04) and T1 (0.935±0.04). The red blood cell (RBC) 6 counts (10 cells/ml) in T4 (1.94±0.2) was significantly higher than T3 (1.51±0.1), T2 (1.1±0.1) and T1 (1.02± 0.3). 3 Similarly, white blood cell (WBC) count (10 cells/ml) was also significantly higher in T4 (12.55±0.2) than T3 (12.11± 0.2), T2 (11.54±0.1) and T1 (10.71±0.3). No significant changes were observed in water temperature (°C), dissolved oxygen (mg/l) and pH under different treatments. The present findings demonstrated that dietary inclusion of stinging nettle enhanced growth, lower cortisol level and increase RBC and WBC count of the fish; thus stimulating the immunity and lower the stress level.

Effect of dietary inclusion of stinging nettle (Urtica parviﬂora) on growth and immunological responses of rainbow trout fry.