nksystemsmustbehightoprovideforcost-effectivefishproductionbecauseofthehigherinitialcapitalcostsoftankscomparedtoearthenponds.Becauseofthisexpenseandthelimitedcapacityofthe“natural”biologicalfiltrationofatank,theproducermustrelyupontheflowofwaterthroughthetankstowashoutthewasteby-products.Additionally,theoxygenconcentrationwithinthetankmustbemaintainedthroughcontinuousaeration,eitherwithatmosphericoxygen(air)orpuregaseousoxygen.Therateofwaterexchangerequiredtomaintaingoodwaterqualityintanksisbestdescribedusinganexample.Assumethata,-gallonproductiontankistobemaintainedataculturedensityof.poundoffishpergallonoftankvolume.Ifthe,poundsoffisharefedaproteinfeedatarateof.percentoftheirbodyweightperday,then.poundsoffeedwouldproduceapproximately.poundsofammonia-nitrogenperday.(Approximatelypercento了循环水系统承载能力,维持充足溶解氧浓度和过滤系统也是非常重要。