鱘魚苗早期暴發(fā)性疾病的病因分析.pdf

1、東北林業(yè)大學(xué)碩士學(xué)位論文鱘魚苗早期暴發(fā)性疾病的病因分析姓名：曾朝輝申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：動(dòng)物學(xué)指導(dǎo)教師：華育平王永林20030601ABS’11RAC’11DiseaseoutbreaksamongculturedsturgeonyearlingshavebroughtgreatlosstosturgeonhusbandryThethesispresentedhereisaimtofindoutthecauseofthedisease

2、Afterinvestigationweknewthemorbidityandmort—ality，presentingsigns，progressionofdiseaseandthencarriedoutthestudyonthediseaseTheresultsarebelowTheprimarilyexaminationdidn’tfindoutanybacteriaandparasitesSturgeonjuvenileswer

3、eexperimentallychallengedwiththetissueextractfromdiseasesturgeonsButtherearenolethaldiseaseintheresultNosuspectedvirusorfungiwasfoundinliverspeen，kidneyandbrainbytissuepathogenmicrobialdeterminationWealsofoundthatprevent

4、andtherapywithantibacterialandantiviralhavenoobviouslyeffectButthehealthsturgeonswereinfectedafter9dayswhentheywereplacedwithdiseasesturgeonIntheexperiment，whichhealhsturgeonswereonlygivenwithartificalfeedorwasstarved，we

5、foundthestarvationcausedbyrefusingthefeedmaybeevokeoracceleratethediseaseWeconcludedtheheavymetalwhichwastracedtowaterworms，wasattributedtothediseaseafterdetectingthecontentofheavymetalincultivationwater，waterwormsanddis

6、easesturgeonstissuesThecontentofHg，PbandCdespeciallyHgisveryhighExposureofAmurSturgeon口cipenserschrenciiBrandt)toHgforacuteandchronictoxicexperimentshowedthatthemedianlethalconcentrations(LCs0，96h)ofsturgeonis050145mgab，

7、andthresholddosageisabout0515mg幾，Inefficiencydosageis00515mg／LinthelongtermexposureInthechronictoxicexperiment，wealsofoundsomediseasedfishshowpartiallysimilarsigntothediseaseoutbreakFromalltheexperiment，wecanconcludethat

8、someunknownvirusagentmaybethecauseofthedisease，andheavymetalpoisoningisallimportantfactortothedisease，andthepathogenesiscanexcludebacteria，parasites，fungiFurtherstudyonthevirusopportunitneedtobedoneKeywords：sturgeon；fry；