In today’s world, heavy metals getting into fish is an inevitable problem that needs to be solved. Fish is a good source of protein, but it can be polluted with toxic metals from various places, such as industry waste products, and fuel from boats. This contamination is both dangerous for the health of fish and harmful for people who consume fish. The study estimated the nutritious value and explored the concentration of heavy metals in fresh water and marine fish species. Out of all fishes 100, there were 40% fresh water and 60% were marine fishes. More lead 0.11365 ± 0.048 SD present in fresh water fish as compare to marine fish 0.0391 ± 0.024 SD (P = 0.000). Mean level of cadmium in marine fish was 0.0849 ± 0.004 SD, while in fresh water fish mean level of cadmium was 0.00369 ± 0.07193 SD (P = 0.056) and, fresh water fish have high chromium 0.145 ± 0.006 SD as compare to WHO standard and similar values are described in marine fishes 0.172 ± 0.009 SD (P = 0.000). Heavy metal levels were very different between the fish species that were studied (p < 0.05). Significant differences in the heavy metal concentrations in different fish types were documented. Results showed that the Cr, Pb, and Cd bioaccumulation in fish species muscles, was greater than the standard concentration suggested in the FAO, EU, and WHO recommendations. The consequences also documented that heavy metals were absorbed into the sea environment, which was observed in the fish tissues, and recommends that heavy metal investigations of fish in polluted rivers should be done frequently by government agencies responsible for environmental health management to ensure that rules are followed.