Effect of iron nanoparticles and encapsulated Lactobacillus plantarum KC426951, as separate and combined on growth and survival of rainbow trout Oncorhynchus mykiss

In this study investigated effect of iron nanoparticles and encapsulated Lactobacillus plantarum KC426951 on growth and survival of rainbow trout (Oncorhynchus mykiss) as separate and combined. After biometry, fish introduced to tanks )30 fish per 500 l tanks) randomly with initial weight of 12.94±0.35 g and fed with different diets for 8 weeks containing 3 dosages of Fe3O4 nanoparticles (30, 60 and 90 mg.kg food-1) and two dosage of encapsulated Lactobacillus plantarum (107 and 108 cfu.g-1) as separate (5 treatments) and combined (6 treatments) and control diet without any supplement. There were 12 treatments and had three replications for each other’s (36 tanks). Results showed that the highest weight gain enhanced in 60 mg/kg iron nanoparticles (T4), 107 cfu/g Lactobacillus plantarum (T1) and their combined (T8) and the lowest in 30 mg/kg iron nanoparticles and their combined with Lactobacillus plantarum (T6 and T7) (p<0.05). The minimum FCR and maximum SGR was observed in T1 (p<0.05). Also survival rate in T6 and T7 were lowest respectively (p<0.05). In totally, it is recommended to use of 60 mg/kg iron nanoparticles and 107 cfu/g encapsulated Lactobacillus plantarum in rainbow trout diet.