４种微生态制剂对虾池水质及青虾生长性能的影响

在测定养殖水体pH值、溶解氧、氨态氮、亚硝态氮等水质指标和养殖青虾肥满度、平均规格、饲料系数等生长性能指标的基础上,比较研究了全池泼洒复合芽孢杆菌、EM菌、类球红细菌、超浓缩光合细菌微生态制剂对养殖水质的改善情况及提高杂交青虾"太湖1号"生长性能的效果。结果表明,4种微生态制剂均可改善水质;其中,芽孢杆菌与EM菌具有较强的降亚硝态氮功能,类球红细菌和EM菌具有较强的降氨态氮作用。4种试验菌剂的调水效果排序为:类球红细菌>EM菌>复合芽孢杆菌>超浓缩光合细菌。4种菌剂不同程度提高了青虾的生长性能;其中,类球红细菌效果最为显著,其次为EM菌、复合芽孢杆菌,而光合细菌的效果不显著。

Effects of Four Micro-ecological Agents on Water Quality in Culture Ponds and Growth Performance of Oriental River Prawn

The improving effects of four micro-ecological preparations,including compound Bacillus,effective microorganisms(EM),Rhodobacter sphaeroides and super-concentrated photosynthetic bacteria,on water quality in freshwater shrimp culture ponds and grow-out performance of hybrid oriental river prawn "Taihu No.1"were comparatively evaluated.The water quality parameters including pH value,dissolved oxygen,ammonia-nitrogen(NH4+-N),and nitrite-nitrogen(NO2--N),and prawn growth performance parameters such as fatness,average size,and feed coefficient were measured.The results indicated that all the four micro-ecological preparations could improve water quality in freshwater shrimp culture ponds,among them compound Bacillus and EM exhibited stronger effects in reducing nitrite-nitrogen,while R.sphaeroides and EM showed stronger effects in reducing ammonianitrogen.These four micro-ecological preparations could be ordered as R.sphaeroides > EM > compound Bacillus > super-concentrated photosynthetic bacteria in terms of their effectiveness in improving water quality.The results also showed that applications of these micro-ecological preparations could improve growth performance of hybrid oriental river prawn in varying degrees,among them R.sphaeroides gave the most remarkable effects,followed by EM and compound Bacillus,while super-concentrated photosynthetic bacteria did not provide sufficient effects.