Effect of dietary herbal extract on tilapia zillii challenged with photobacterium damselae

Abstract EN

The present study focused to evaluate Oregano on hematological parameters, plasma analysis and disease resistance of Tilapia zillii.

In this experiment, fish were divided into 3 groups in triplicate manner.

The first two groups fed onto basal diet, the third group fed onto basal diet supplemented with Dosto oregano oil 10% powder.

Results revealed that oregano enhance the hematological parameters and plasma parameters than basal diet.

In addition to immunocompetence assay against Photobacterium damsale subspecies damsale, the obtained results indicated that, oregano enhanced the immune responses and increased resistance to Ph.

damsale infection in T.

zillii.