Growth traits of tilapia （GIFT） cultured intensively in brackish water
HU Zhao-ying, XIE Jun, YU De-guang, WANG Guang-jun , TANG Li-hua , DU Xu-tong , LU Mai-xin
1. College of Aqua - life Science and Technology, Shanghai Ocean Univ. , Shanghai 201306, China; 2. Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China
Abstract: The tilapia（GIFT） was cultured intensively in brackish water （ a salinity of 2 - 8 ） in Zhuhai to evaluate the growth traits. The GIFT had good growth through the whole 174 days, with average growth of 5.58 g/d （the maximum growth of 13.25 g/d, and the instantaneous growth rate of weight （IGRW） of 2.54% ）. They reached more than 600 g in body weight after 130 day feeding. The regression equations of the body weight （W） and the body length （L） was expressed as W=0. 0582L^2.89（R^2 =0. 9968）, and the body length and culture period （t） as L = -0. 0169t^3 ＋0. 1911t^2 ＋2. 3675t ＋0. 7124（R^2 =0.9947）. The higher condition factor was found at the beginning of the experiment, with peak value of 6.19, then decreased and finally recovered to 4.22. The average feed conversion ratio （FCR） was found to be 1.44, indicating that the GIFT has a good growth performance in low saline water.
2009, Vol. 24 
