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1、精养鱼池的水质与调控技术（Waterqualityandregulationtechniquesoffishpond）Thehighertheamountofammonianitrogenreleasedintothewaterbyfeedinghighproteinfeed,themoreseriousthewaterpollution.(two)ammoniatoxicityofammoniawatertofishthroughnitrificationandnitrificationcanbetransformedintoNO3N,orintheform
2、ofN2emissionintotheatmosphere,canbeconsumptionofaquaticplantsandsedimentadsorption,onlywhenthepoolwaterisgreaterthanthetotalnitrogendissipation,excesstotalnitrogenwillaccumulateinthepoolthewaterreachesacertainlevelwillmakefishpoisoning.Accordingtoreports,carpfryanddotmeaningfishtail
3、backto24andahalfhourslethalammoniaconcentrationswere1.78mg/Land2.76mg/L,seedlingsaremoresensitivethanadults.Inthemandarinfishtoxicitytest,LC50/L0.92mgfor24hours,48hoursand96hoursofLC50were0.49mg/Land0.32mg/L,sothatshouldbecontrolledat0.032mg/Lconcentrationofammonianitrogeninmandarin
4、fishfarming,cyprinidfishshouldbecontrolledat0.05~0.1mg/L.Whentheammonianitrogenreached0.05~0.2mg/L,thefishgrowthratewilldecline,suchasdotmeaningfishtailbacktocontaininggrowthof0.05~1.0mg/LNH3-Ninwater,theyielddecreasedlinearlywhentheconcentrationreached0.5mg/L,bythevolumeofproductio
5、n.TheEuropeanInlandFisheriesAdvisoryCommitteebelievesthatammonianitrogenshouldbecontrolledbelow0.021mg/L,andthesafetystandardforammonianitrogenintheaquaticenvironmentprovidedbytheenvironmentalprotectionagencyoftheUnitedStatesis0.016mg/L.(three)theinfluencefactorsofammoniatoxicity:1.
6、ammoniatoxicityisnotonlyrelatedtothetotalamountofammonia,anditexistsintheformofacertainextent,ammoniaion(NH4-N)isnoteasytoenterthebody,lowtoxicity,andnonionicNH3Nstrongtoxicity,whenitcomestofishthroughthegillsandskinmembrane,notonlyincreasetheburdenofammonianitrogenremovalfromfish,a
7、ndwhentheconcentrationofammoniaintheblood,thefishinthebloodpHvalueincreased,thusaffectingtheenzymesinfishactivity.ThestudyshowsthatwhentheNH3Nconcentrationishigher,themorereducedAPK(serumalkalinephosphatase(LSZ)andserumlysozymeactivity),abnormalchangesinitsactivity,reflectsthefuncti
8、onaldisorderordamag
