Effects of Plantago ovata extract on none specific immune parameters of the juvenile Oncorhynchus mykiss

Oncorhynchus mykiss is one of the most important species among all fish which are consumed in most countries. Applying antibiotics to control diseases in this species has side effects which necessitates researches to find other approachs. Therefore effects of Plantago ovata extract (POE) on Oncorhynchus mykiss immunity system was investigated as another alternative. 360 juvenile Oncorhynchus mykiss fishes with the average weight 30±5.23gr divide in to four treatments. Each treatment feed with POE with 0 (control group), 0.1, 0.5 and 1 percentage for 60 days. At the end of treatment blood samples were taken from 6 fish in each replicate and immunological parameters were compared among the groups. The results show that the immunological parameters including Lysozyme activity, total serum protein and globulin were affected significantly at doses 0.5 and 1 percent (p0.05). All and all it could be deduced that extract could affect immunological parameters and increasing it, hence addition of this extract to daily diet of Oncorhynchus mykiss could enhance immunity system.