EFFECT OF OLIVE LEAF EXTRACT ON GROWTH PERFORMANCE, FEED UTILIZATION AND PHYSIOLOGICAL STATUS OF NILE TILAPIA

Document Type : Original Article

Authors

1 Fish Resources and Aquaculture Department, Faculty of Environmental Agricultural Sciences, Arish University, Egypt

2 Animal Production Department, Faculty of Environmental Agricultural Sciences, Arish University, Egypt.

Abstract

The purpose of this study was to examine how dietary olive leaf extract (OLE) affected the Nile tilapia's growth performance, feed utilization, physiological and histological status. In twelve 1.0 m³ hapas, 180 Nile tilapia fishes, each weighing 11.82±0.02 g and with a body length of 8.80±0.10 cm, were randomly distributedin four groups. Group one received 1% kg-1OLE, Group two received 1.5% kg-1OLE, Group three received 2% kg-1OLE, and the control group received no olive leaf extract for ninety days. At the end of the trial, group 3(2% kg-1 of OLE) had considerably higher weight gain, length gain, and specific growth rate values than other experimental groups. Additionally, the trail groups fed different amounts of OLE showed improvements in feed intake and protein intake values. The group fed the diet with OLE had significantly lower levels of blood albumin, and triglycerides compared to control. Group three (2% kg-1 of OLE) had significantly greater levels of blood total protein and globulin, as well as alkaline phosphatase, ALT, AST, amylase, lipase, and protease activities when compared to other groups. The results showed some histological alterations in the liver, especially in Group 1, while the tissues of the intestine and spleen appeared normalwhen treated with OLE. According to the current findings, diets containing 2% kg-1 of OLE were effective feed additives and may help in enhancement of utilization of food, organo-somatic indices, and some biochemical items of Nile tilapia

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