Comparative Study of Whole-Body Proximate Composition, Dressing Losses and Bioaccumulation of Heavy Metals in Muscle Tissues of Wild and Farm-Raised Labeo Rohita

Abstract

The muscle tissues of wild and farm-raised rohu were analyzed for proximate composition (Crude protein, crude fat, ash, and dry matter) and uptake of heavy metals (Cd, Ni, Pb, and Cr) using the standard protocols. For this purpose, wild fish samples were collected from the Khanpur Canal, Sheikhupura, and farmed fish samples from a local fish market in Lahore. The results showed that the concentration (%) of protein (17.92±0.36), ash (06.54±0.13), and moisture (76.50±1.53), was observed to be higher in the wild when compared to protein (16.90±0.34), ash (5.07±0.10) and moisture (73.50±1.47) of farm-raised rohu. In contrast, crude fat contents were observed to be higher (4.02±0.08) in farm-raised rohu than wild (03.65±0.07). In terms of dressing losses, wild fish showed higher (26.37%) losses as compared to farm raised (25.83%). Results showed that in wild and farm fish’s muscles, the trend of the heavy metals was Pb > Cd > Ni > Cr. The findings demonstrated that in comparison to Cd, Ni, and Cr, Pb concentration (ppb) was greater in both wild (128.32.82) and farm-raised (111.42.16) rohu. When compared to wild rohu, farmed rohu showed a higher bioaccumulation tendency for Cr and Ni, but Cd and Pb showed the reverse pattern. The findings of this study suggest that fish proximate composition, dressing losses, and bioaccumulation of heavy metals are certainly impacted by the aquatic life of freshwater fish like Labeo rohita both in wild and farmed conditions and these results will be helpful for the aquaculturists as well as the local consumers of the fish.