Organophosphorous residue in Liza aurata and Cyprinus carpio

Objective:To determine the amount of azinphos methyl and diazinon residues in two river fishes,Liza aurata and Cyprinus carpio,in the north of Iran.Methods:This study was done during2006-2007.In this survey,152 water and fish samples from Gorgan and Qarasu rivers,north of Iran,were investigated.Sampling was done in three predetermined stations along each river.Organophosphorus compounds(OPs)were extracted from the fishes and the water of rivers.After extraction,purification and concentration processes,the amount and type of insecticides in water and fish samples were determined by high performance thin layer chromatography(HPTLC).Results:There was a significant difference in the residue of the insecticides in the water and fish samples between summer and other seasons in the two rivers.The highest amount of insecticides residue was seen during summer.In both rivers,the amount of diazinon and azinphos methyl residues in the two fishes was more than 2000 mg/L in summer.There was no significant difference in insecticides residue between the fishes in two rivers.The diazinon residue was higher than the standard limits in both rivers during the spring and the summer,but the residual amount of azinphos methyl was higher than the standard limits only during the summer and only in Qarasu River.Conclusions:It can be concluded that the amount of OPs in the water and the two fishes,Liza aurata and Cyprinus carpio,is higher than the permitted levels.

Heavy metal concentrations inLiza aurata(Risso,1810)captured from the Kerkennah Islands(Gulf of Gabes)and associated health risks

Objective:To determine the concentration of heavy metals(Cd,Cu,Fe,Ni,Pb and Zn)in the liver,gills and muscle of Liza aurata(L.aurata)collected from the Kerkennah Islands.The target hazard quotient was also used as an indicator of human health risks associated with fish consumption.Methods:The sample was collected from Kerkennah Islands(Gulf of Gabes,Tunisia).Heavy metals in L.aurata tissues(gills,liver and muscle)were analysed with an atomic absorption spectrometer(PerkinElmer).Results:As expected,muscle always possessed the lowest concentrations of all metals.The maximum concentrations of Cd(0.52 mg/kg wet weight),Cu(5.43 mg/kg wet weight),Fe(115.27mg/kg wet weight)and Zn(112.20 mg/kg wet weight)were measured in the liver,while the highest Ni(1.54 mg/kg wet weight)and Pb(1.43 mg/kg wet weight)were recorded in gills.The target hazard quotient through consumption of fish and calculated by adding the inividual target hazard quotient was below 1,indicating that there was no significant potential health risk associated with consumption of L.aurata.Conclusions:L.aurata from the Kerkennah Islands may be suitable for human consumption.