An implication of insects in criminal investigations is not a new field. Forensic entomology developed through the 13th century. It deals with the application of insects and arthropods to solve crimes. It provides many helpful outputs about cadavers which can lead us to solve the committed crime. Proper identification of insects and analysis of succession is important to utilize these insects for estimating postmortem interval (PMI). In this article, a comparative study of biodiversity and species succession of Forensic fauna associated with normal and burned fish carcasses is reported. This study was conducted in a rural area, near Palitana city located in the Saurashtra region, Gujarat, India. The period of study was 20 days of the winter season from 7th-26th February 2020. 22 species of three orders namely Diptera, Coleoptera, and Hymenoptera were developed on the carcasses. The pattern of their success concerning the decomposition of carcasses was also noted. On the carcasses, ants are predominant in this area and one member of Chalcididae namely Brachymeria podagrica was also observed as a parasite.