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OALib Journal期刊
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acutetoxicityandbehaviouralresponsesofafricancatfish,clariasgariepinustoaminesaltof2,4-d
DOI: 10.3724/SP.J.1145.2010.00347, PP. 347-352
Keywords: acutetoxicity,2,4-d,clariasgariepinus,opercularbehaviouralchange
Abstract:
fingerlingsofafricancatfish,clariasgariepinus[meantotallength,(7.0±1.0)cmsd;meanweight,(3.0±0.7)gsd]wereexposedtoacuteconcentrationsofaminesaltof2,4-d(0,50,200,250,350,and400mg/l)todeterminethebehaviouralresponsesandmortality.whenraisedinaquariathefishbecamehyperactive.thebeatfrequencies(opercularandtailbeatfrequencyperminute,obfandtbf)oftheexposedfishdeclinedwithincreaseintheexposuredurationandconcentration,butthereversewasthecasewithpercentmortality.thesevariablessignificantlydifferedatboththeexposuredurationandconcentrationofthetoxicant(p<0.05).anovaofthelinearregressionbetweenvariables-obf,tbfandmortalityonexposuredurationindicatedastrongpositiverelationship(p<0.001)withtheentirevariablesexceptmortalityandexposureduration.obfandtbfwereinverselycorrelatedwithexposureduration(r=-0.99;p<0.05).the96hlethalconcentrationwas165.36(133.29~190.51,c.l.)mg/landthemedianlethaltimeatthehighestconcentrationwas20.41(11.87~27.46)h.theresultsfromthisstudyrevealedthat2,4-dwasverytoxictoc.gariepinusunderlaboratoryconditionsanditsapplicationshouldtherefore,berestrictedinthefield.fig3,tab3,ref45
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