桂北山区稻田罗非鱼生长性能研究

Study on the Growth of Tilapia in Paddy Fields in Northern Guangxi

在桂北高寒山区开展稻田罗非鱼生态养殖试验。通过分析罗非鱼生长常数、特定生长率、血液生理生化指标,探究罗非鱼在高寒山区稻田的生长性能。结果表明,在水温26.4℃时,生长常数最大值为0.76 d,罗非鱼在桂北山区稻田获得良好的生长性能。对罗非鱼特定增长率和日增质量与水温的关系二次回归曲线进行拟合,水温与罗非鱼特定生长率相关曲线为y=0.1129x2-6.6352x+98.537(R2=0.6345),水温与饵料系数相关曲线为y=-0.0013x2+0.0922x-0.2948(R2=0.4418),罗非鱼在桂北地区稻田最佳生长水温为26.4℃。在水温22.0~29.0℃时,血液生理生化指标表明,高寒山区罗非鱼能保证机体组织器官的完整性和正常功能。

The study was carry out the ecological breeding experiment.On the tropical fish tilapia which was introduced into the paddy fields in the high and cold mountainous areas of northern Guangxi.Through the study of tilapia growth constant,specific growth rate,and blood physiological and biochemical indicators in the paddy fields in the high and cold mountainous areas,the growth performance of tilapia in the paddy fields in the high and cold mountainous areas was explored.The results showed that the growth constant reached the maximum value of 0.7620 at 26.4 C,indicating that tilapia had good growth performance in the paddy fields in the mountainous areas of northern Guangxi.Fit the quadratic regression curve of the relationship between tilapia body weight growth rate,specific growth rate and daily weight gain and water temperature.The correlation curve of water temperature and tilapia specific growth rate y=0.1129 x2-6.6352 x+98.537(R2=0.6345),correlation curve between water temperature and feed coefficient y=-0.0013 x2+0.0922 x-0.2948(R2=0.4418),indicating that the optimum water temperature parameter for tilapia growth in paddy fields in northern Guangxi is 26.4 C.In the temperature range of 22.0-29.0 C,the study of blood physiological and biochemical indexes showed that tilapia in alpine moun-tains can ensure the integrity and normal function of organism tissues and organs.