author(s)
Jayati Adhikary, Atanu Maity, Bipul Kumar Das, Satarupa Ghosh and Prasanna Pal

abstract
Sewage-fed aquaculture is a well-known method of fish cultivation. As the wastewater is generally contaminated with heavy metals and other pollutants; fishes and other aquatic organisms tend to accumulate them. It creates a serious health problem when these are consumed by a human being. The objective of our study was to assess the concentration of two potentially toxic metals namely cadmium (Cd) and lead (Pb) in tissues of rohu fish (Labeo rohita) collected from the sewage-fed pond of Kolkata. Samples were collected fortnightly from January to June 2014 and the level of metals was determined by Atomic Absorption Spectrophotometer. We observed that accumulation of Cd and Pd in fish tissue ranged from 0.002-0.013µg/g and 0.23-1.84µg/g respectively. Higher concentration was found in internal organs like liver, kidney and gill compared to muscle. It indicates that the conventional method of fish preparation in West Bengal by discarding the offal (i.e., liver, kidney, gills etc) should be followed everywhere. Though the concentration of metals was below the prescribed limit, people should be aware of the possible threats in the near future.