THE EFFECTS OF MICROBIOLOGICAL COMPOUND ON ECOLOGICAL FACTORS IN CULTURE WATERS

Abstract:

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.