USING OF YUCCA SCHIDIGERA EXTRACT (YSE ) AGAINST AMMONIA TOXICITY AT DIFFERENT STOKING DENSITY FOR IMPROVEMENT GROWTH PERFORMANCE AND PHYSIOLOGICAL STATUS OF NILE TILAPIA (OREOCHROMIS NILOTICUS)

USING OF YUCCA SCHIDIGERA EXTRACT (YSE ) AGAINST AMMONIA TOXICITY AT DIFFERENT STOKING DENSITY FOR IMPROVEMENT GROWTH PERFORMANCE AND PHYSIOLOGICAL STATUS OF NILE TILAPIA
(OREOCHROMIS NILOTICUS)

Adel M. Shalaby¹; El-Sayed A. Shoker¹; Mohamed k. Khames²; Doaa K. Khames²; Mohamed M. Zenahm² and Mohamed E. Radwan³

¹Hatchery and fish physiology, ²Fish nutrition, ³Fish aquaculture department, Central Laboratory for aquaculture research, Abbass, Sharkia.

Corresponding auther: [email protected].

Abstract

This study was based on a 2×4 factorial design with or without Yucca schidigera extract (YSE) and four stoking densities T1=100, T2=100, T3=150, T4=200 and T5=250 fish/m³). In this study, Nile tilapia, Oreochromis niloticus (L.), (2 to 3g) was distributed into the fifteen aquaria at a rate of 10, 10, 15, 20 and 25 fish/100L ^, according to design of experiment to five groups each group three replicate (The 1st group(T1) was contain 10 fish /100 L without Yucca and left as control. While 2^nd group , 3^rd group ,4 ^th group and 5 ^th groups (T2, T3, T4 and T5) at density 10, 15, 20 and 25 fish /100L of aquarium and received 10mg of Y. schidigera extract /100L) respectively. At the end of the experimental trial, blood samples were taken to determine the different physiological variables. The growth parameters were positively affected by YSE and inversely affected by stocking density. The high growth performance (WG. SGR and RGR) of tilapia, subject at yucca with 100 and 150 fish density, respectively than the control group (10 fish density without YSE). The best feed conversion ratio was obtained with yucca plus 10 fish density .Also The highest values of protein efficiency ratio and protein productive were obtained with yucca at stock densities of 100 and 150 fish/m³.The physiological variables including erythrocyte count (RBCs), haemoglobin content (Hb), haematocrit value (Hct) and activities of aspartate aminotransferase(AST), alanine aminotransferase (ALT), total protein, albumen ,total lipids, and glucose in plasma were significantly affected by yucca extract and/or rearing density. The overall results presented here indicate that the best growth performance of Nile tilapia was obtained when the fish reared with yucca and at a stocking density of100 or 150 fish/m³.

Key words: Density of O. niloticus, yucca, growth, physiological parameter.