Effect on Histology and Nutrient Digestibility of Supplemented Origanum onites Essential Oil to Rainbow Trout Diets (Oncorhynchus mykiss)

Abstract

The present experiment was conducted to describe the effects on histology (experiment 1) and nutrient digestibility (experiment 2) of rainbow trout fed with diet containing O. onites oil. Diets were prepared with supplemented in different concentrate (0, 0.125, 1.5, 2.5, 3.0 ml kg -1 ) of O. onites oil. A total of 1050 trout (body weight 26.05 0.15 g) were randomly stocked into 15 tanks. The experiments were done in triplicate.