Fish samples[Catla,Silver carp , Common carp,
Tilapia(Oreochromis niloticus), Mrigal Etroplus
suratensis, Murrels (Channa marulius), Nandus nandus
Amblypharyngodon mola Catfishes (Heteropneustes
fossilis) ]were purchased from the lakes. The size of the
fish collected varied, depending on the species, between
12 cm and 54 cm, and their age was from 6 months to 1
years.Fish from each variety dissected to separate organs
(flesh, gills, liver and kidney) according to FAO method.
The separated organs were put in petridishes to dry at 120
oC until reaching a constant weight. The separated
organs were placed into digestion flasks and ultrapure
Conc. HNO3 and H2O2 (1:1 v/v) was added . The
digestion flasks were heated to 130 oC until dissolution ,
diluted with water and analysed for heavy metal
concentration using atomic absorption Spectrometer.