大口黑鲈工厂化循环水苗种培育和池塘成鱼养殖的水质处理效率分析OA

[Objective]This study aims to investigate the water quality control requirements for factory-based recirculating aquaculture system fry cultivation and pond grow-out of largemouth bass(Micropterus salmoides),providing scientific basis for improving water quality management techniques.[Methods]The water treatment efficiency of microfiltration unit,nitrification tanks,and pond application of Bacillus spp.was evaluated based on water quality regulation technology.[Results]1)Factory-based recirculating aquaculture fry cultivation:total phosphorus(TP)and total nitrogen(TN)concentrations in the culture tanks were significantly affected by feeding amount(P<0.01),and they increased as the feeding amount increased or decreased as the feeding amount decreased.The microfiltration machines achieved removal rates of(16.26±6.87)%for suspended solids(SS)and(12.94±5.07)%for chemical oxygen demand(COD).The biofilter removed(18.51±7.73)%of total ammonia nitrogen(TAN)and(5.87±3.51)%of nitrite nitrogen(NO2−-N).The nitrification capacity showed an overall downward trend as the culture time extended.2)Grow-out pond culture:Within 6 hours after applying Bacillus spp.,the highest removal rates for SS and COD were observed,with average values of(15.07±3.55)%and(14.22±2.59)%,respectively.The mean removal rates for TN and TP were(10.35±2.33)%and(8.71±0.92)%,respectively.The average removal efficiencies for TAN and NO2−-N were(9.70±2.81)%and(7.76±3.28)%,respectively.[Conclusion]The study has clarified the relationship between the water treatment meth-ods and the concentrations of TAN,NO2−-N,TN,TP,SS,and COD in the aquaculture water for larval M.salmoides in factory-based recirculating aquaculture systems and adult fish in pond culture.It has obtained relevant data on water treatment efficiency,which can provide technological support for the related aquaculture models of M.salmoides.