effectofcutoxicityatdifferentsalinityonselectivegroupofjuvenilepompanotrachinotusovatus

？effectsofcoppertoxicityandsalinityshockonselectivegroupofjuvenilepompanotrachinotusovatuswereinvestigated.thefishwereexposedtodifferentcu2+concentrationsof0(blank),0.02(c1),0.05(c2),0.10(c3),and0.15mg·l-1(c4)atasalinityof10‰or40‰for96h,withthesalinityof29‰asthecontrol.theresultsshowedthattheeffectsoftheacutesalinitystimulationtosurvivalratesofpompanobetweencontrol(29‰)andlowerorhighersalinityfor96hwerenotsignificant(p>0.05).however,thesurvivalratesineachtreatmentweredecreasedwiththeincreaseofcu2+concentration.thedominantfactorinfluencingbodymoistureofthefishwassalinity,andtherewasnosignthatbodymoisturewascorrelatedwithexposuretocu2+.thegilllamellasinhighlevelofcu2+concentration(c4treatments)wereabnormalunderthesalinityof40‰andextremelycurlyunderthesalinityof10‰.hemorrhageingillwasobservedinthetwoc4treatments.undertransmissionelectronmicroscope,pillarcellsingilllamellasappeareddeformedandrupturedinsomeareasoftheepitheliainthehigherconcentrationofcu2+,resultinginthedeathofthefishduetothedestructionofgilltissue,elevationofthearithmeticmeandistancefromwatertoblood,thedecreaseofoxygendiffusioncapacity,andotherphysiologicalfunctions.thesefindingsindicatethatthepompanomightsuffermuchmorepressurewhenencounteredwithcu2+pollutionandlowsalinity.