摘要
本文研究了在罗非鱼养殖池中投放以芽胞杆菌为主体的复合微生物对池塘微生物菌相、水质条件、藻相和罗非鱼生长状况的影响，菌剂含活菌数为109个／g，用量为1．5mg／L，一个月的试验表明：①投放的芽胞杆菌繁殖成鱼池的优势菌群，高峰时占异养菌数的50％，但这种优势不能长久维持，约15天后需再次投放；②鱼池投放菌剂后，能有效改善水质条件，底层溶氧明显增加，溶氧量增加2倍以上；有效降低氨氮和亚硝酸盐；营造清新的黄绿色藻相；③菌剂有促进罗非鱼生长的作用，对照组鱼增重14％左右，试验组鱼增重约30％，并降低了饵料系数。
The effects of adding microbe of Bacillus into culture-ponds concerning phase of bacterie, conditions of water quality, algae, and growth of Tilapia were studied.The concentration of living microbe was 109cell/g, and dosage was 1. 5mg/L. The results af ter one month showed as follows: 1)The microbe of Bacillus added into the ponds became the dominantal microbe, and it was 50% of the total haterotrophic bacteria at the peak, but this superiority only maintained about 15 days and here after the microbe ought to be added once more. 2) In such a way microbe added into the ponds could improve the conditions of quality effectively. The contents of the dissolved oxygen increased over two times, the contents of NH3 -Nt and NO1- -N reduced and the water turned into the refresh yellow-green color. 3) The average weight of fish (AW) increased obviously. The AW of the control group was 14% or so while the trial group was about 30%, and the food conversion efficiency reduced effectively.
出处
《上海水产大学学报》
CSCD
1999年第1期43-47,共5页
Journal of Shanghai Fisheries University
关键词
复合微生物
生态因子
养殖水体
藻类
罗非鱼
microbiological compound, ecological factor,culture waters, algae,growth of Tilapia, conditions of water quality
