Effect of Medical Plants on Digestive Enzymes and Growth Performance of rainbow trout (Oncorhynchus mykiss)

Authors

Tarek Abdalsalam Salem Altief Department of Basics of Veterinary Sciences / Omar Al-Mukhtar University / Libya / El Beida.libya
Ahmed Alhadi Almsbrok Department of veterinary sciences / Higher Institute of Agricultural Technology / Alghairan / Libya
Iman Daw Amhamed Department of Zoology/ Zintan university / Libya
Soner Bilen Department of Basic Sciences, Faculty of Fisheries and Aquaculture, Kastamonu University, Turkey

Keywords:

Glycyrrhiza glabra, Coriandrum sativum, Cassia angustifolia, rainbow trout, digestive enzymes, growth parameters

Abstract

This study was designed to evaluate the growth and digestive enzyme activity parameters of rainbow trout juvenile Oncorhynchus mykiss fed diets containing different levels (0%, 0.1%, 0.5% or 1%) of Glycyrrhiza glabra, Coriandrum sativum and Cassia angustifolia aqueous methanolic extract as a feed additive seventy-five days. The fish with initial weight of 22.65 ± 0.07 g were divided into 30 tanks so that 10 groups would be formed and stored as 50 fish in each tank, so the experiment was started as three replications. At the end of every month, samples are collected from the digestive system for use in measuring digestive enzymes, and scales and weights for use in measuring growth rate. Digestive enzymes like pepsin, trypsin, amylase and lipase and growth parameters such as final weight, weight gain (WG), specific growth rate (SGR), feed conversion ratio (FCR). Amylase, lipase, pepsin and trypsin are different in terms of enzyme activities. The effect of medicinal plants gave a good indication of improvement in the effectiveness of digestive enzymes with the length of the experiment during the surrounding environment. The values related to the growth parameters were lower than the control group in the study where similar or low values were encountered.