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红罗非鱼对盐度的适应范围较广,本试验将红罗非鱼由淡水中以5‰的盐度梯度逐步驯化到17.5‰的海水中,成活率达100%;其最佳生长盐度范围是5‰～10‰,耐盐度可达35‰,至40‰盐度时出现死亡。在不同盐度水体中生长的红罗非鱼粗蛋白、粗脂肪含量顺序为:17.5‰组>10‰组>5‰组>0‰。红罗非鱼和对虾混养,对虾成活率达89.7%;红罗非鱼成活率为62.6%,而日增重率达2.26克/天。经测量和数理统计分析,确定在咸淡水中生长的红罗非鱼体重(W)与全长(L)、体重与体高(H)均呈直线关系。计算出它们相应的回归方程式,体重与全长的相关系数为r_(WL)=0.952,体重与体高的相关系数r_(WH)=0.891,这在选种工作中有一定的参考价值。
Red tilapia to adapt to a wide range of salinity, the red tilapia from freshwater to 5 ‰ salinity gradient gradually acclimated to 17.5 ‰ of seawater, the survival rate of 100%; the best growing salt Degree range is 5 ‰ ~ 10 ‰, salinity up to 35 ‰, to 40 ‰ salinity when the death occurred. The crude fat content of red tilapia grown in different salinities was 17.5 ‰> 10 ‰> 5 ‰> 0 ‰. Red tilapia and shrimp polyculture, shrimp survival rate of 89.7%; red tilapia survival rate of 62.6%, while the daily gain rate of 2.26 g / day. Through measurement and mathematical statistics analysis, the body weight (W) of red tilapia grown in fresh and brackish water was linearly correlated with full length (L), body weight and body height (H). The corresponding regression equation was calculated. The correlation coefficient between body weight and total length was r WL = 0.952, and the correlation coefficient between body weight and body height r WH was 0.891, which has certain reference value in the selection work.