The effects of dietary L – Lysineon and L - Carnitine on growth performance, survival and some serum biochemical parameters in Oncorhynchus mykiss fingerlings

This study was conducted to evaluate the effects of dietary L - Lysineon and L - Carnitine on growth and survival and some blood biochemical parameters of Oncorhynchus mykiss fry. For this purpose, Oncorhynchus mykiss fry with a mean weight of 25 gr in 10 treatments with 2 replicates were distributed randomly in 20 tanks. The L – Lysineon and L - Carnitine diet was added to diets at different levels. The breeding period was considered to be 8 weeks. Growth indices, survival rate and blood biochemical indices and safety factors, as well as comparisons between treatments at the end of breeding period blood sampling was performed. The results showed that the treatment fed L – Lysineon 0.5 and L – Carnitine 1gr/kg diet of L – Lysineon and L – Carnitine material had significant differences with the control group in the final weights, weight gain, body weight gain percentage and reduction in feed conversion ratio (P<0.05). In terms of survival rate of fish, the highest survival rate was observed in treatments containing different levels of L – Lysineon 0.5 and L – Carnitine 1 gr/kg.  The results showed a significant difference between plasma biochemical factors such as glucose, triglyceride, and cholesterol in levels of L – Lysineon 0.5 and L – Carnitine 1 gr/kg. (P<0.05). The highest amount of total protein, albumin, and globulin was observed in this treatment, which significantly differs from the control treatment (P<0.05). As a general conclusion, it can be stated that the use of L – Lysineon 0.5 and L – Carnitine 1 in the Oncorhynchus mykiss fry diet can increase and improve the growth, survival index and stimulate the immune system and thus improve health and physiological status of Oncorhynchus mykiss.The addition of L – Lysineon 0.5 and L – Carnitine 1 of feed for Oncorhynchus mykiss fry are suggested.