The Survey and Comparison of Heavy Metals Hg, Cd and Pb in the Tissues of Liza Abu in the Karoon and Dez Rivers in Khoozestan Province

The heavy metals are from the pollutants which create too much problems in aquatic ecosystems for aquatics and human. This study was done on concentration of heavy metals Hg, Cd and Pb in the muscle, liver and gill tissues of Liza Abu in the Karoon and Dez Rivers in Khoozestan Province in winter 2010. In this reaserch 216 sample of Liza abu were used randomly. Metals were extracted from the tissues using wet Digestion method and concentration of the heavy metals was measured by Atomic Absorption Spectrophotometer Perkin Elmer 4100. Analysis of the data was done by using of the SPSS17 software and analysis of the t-test determined exist or non exist of the significant difference in level 95 (P=0.05). The highest concentration of Cd, Hg and Pb 0.540±0.264, 0.027±0.002 and 1.08±0.128 mg/Kg and the determined lowest concentration of Cd, Hg and Pb 0.346±0.040, 0.903±0.037 and 0.023±0.001 mg/Kg. This study showed there is not any significant difference in concentration of heavy metals Hg and Pb in muscle, liver and gill of Liza abu in Karoon and Dez Rivers. There was a significant difference in Concentration of Cd in muscle and gill (between (P<0.05) but there was not a significant difference in concentration of Cd in livers of all of them (P>0.05).