Investigation of effects of lead (Pb) heavy metal on bio-accumulation and necrosis of hepatopancreas and muscle tissues of the oriental river prawn, Macrobrachium nipponense

The main objective of the current study was investigation of effects of lead (Pb) heavy metal on bioaccumulation and necrosis of the hepatopancreas and muscle tissues of the oriental river prawn (Macrobrachium nipponense). According to the past studies and the recorded concentration range of heavy metal in the rivers leading to the Anzali wetland, the present study was carried out with four treatments and three replications. The research was done in four treatments of lead (Pb) heavy metal in concentrations 0 (control), 5, 15 and 25 ppm for two months. During the experiment, the prawns were fed at the standard level and to the amount of appetite twice a day with shrimp standard pellet. According to the results, by increasing concentrations of heavy metal of the treatments, bioaccumulation rate of lead (Pb) heavy metal in mentioned tissues increased significantly (p<0.05). Histological results showed that higher concentrations of heavy metal of the treatments will cause changes in both hepatopancreas and muscle tissues. The findings of this research showed that higher concentrations of lead (Pb) heavy metal will cause tissues responses; so that these responses show in hepatopancreas tissue, as a metabolic and active tissue. According to the above findings, undesirable biological effects of heavy metals on prawns were indicated. This issue increases need for management and importance of preventing entry of pollution sources such as heavy metals to Anzali wetland and its basin rivers.