EFFECT OF CERTAIN ANTIBIOTIC DRUGS AND CERTAIN AMINO ACIDS ON THE PHYSIOLOGICAL ACTIVITIES, GROWTH AND RESIDUAL MEASUREMENTS IN TILAPIA FISH

Abstract

The experimental work of the present study was carried out at the laboratory of fish Nutrition, Faculty of Agricultural, Moshtohor, Benha University. Two experiments were conducted. The first experiment aimed to evaluate the effect of different L­ camitine levels and amino acids in tilapia diets (0, 300 mg L­ carnitine, 10 g lysine + 5 g methionine, 15 g lysine + 7 g methionine, 10 g lysine + 5 g methionine + 300 mg L- carnitine and 15 g lysine + 7 g methionine + 300 mg L- carnitine) on growth performance, feed utilization and body composition of nile tilapia. While the second experiment aimed to study the effect of different doses of flumequine (0, 6, 8, 10, 12 mg sub therapeutic doses during 90 days and 12 mg therapeutic dose for 5 days) on growth performance, feed utilization, body composition, chromosomal aberrations and determination of flumequine residues in tissues of the same fish species. The first experiment started at 1 June 2003 and lasted until 3 August of the same year (90 days), w:h@)he second experiment was started on 1 September 2003 and lasted until 30 November of the same year (90 days) therefore twelve diets were formulated and tested in twenty four aquaria (Two replicate for each diets). Each aquarium was stocked with 25 fish of Nile tilapia for first experiment with initial weight 1.63 ± 0.07 and 20 fish for the second experiment with initial weight 13.71 ±0.41 the experimental fish were distributed randomly into the experimental aquaria.