Having poor organoleptic characteristics in formalin treated fish [14]; price comprises a little difference with less potentiality compared with inland production. Though inland aquaculture account 39% of total fish production, a major portions are being imported from neighboring countries prompts the risk for formalin treatment. Dhaka and Sylhet, two economically potent district of Bangladesh showed a comparative nomenclature on fish marketing, holding similarity on formalin practice signified by a slight epidemic with 17.3% [13] in Sylhet come up to Dhaka with 6.25% [4].Large species are more affected as to small one; intimated by both study zones taking in 10.25% and 13.3% estimating the affected rohu with 44% and 42.3% in Dhaka and Sylhet aside. Formalin treated small species comprising 2.25% and 33.3%, found in Dhaka & Sylhet respectively.