复合微生物对养殖水体生态因子的影响

本文研究了在罗非鱼养殖池中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１）６９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

THE EFFECTS OF MICROBIOLOGICAL COMPOUND ON ECOLOGICAL FACTORS IN CULTURE WATERS

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.