An essential omnivore found in mangroves, brackish water, estuarine, or lagoon regions. It preys on mollusks, smaller crabs, and fish. This species plays a crucial role in regulating the populations of benthic invertebrates (such as snails and bivalves), thereby contributing to ecological equilibrium. By consuming mangrove detritus, the plant materials from mangroves are transformed into animal protein, which becomes a significant source of prey within coastal food webs. Through its diet of detritus and small benthic organisms, it aids in the breakdown of organic matter, further supporting the mangrove detrital food web. The consumption of mangrove leaf litter also facilitates nutrient cycling and helps maintain the structure of mangrove soil. Juvenile and soft-shelled S.serrata crabs fall prey to birds, larger fish, and various marine predators. S.serrata creates burrows in mud or sandy substrates, particularly in mangrove and estuarine environments, leading to bioturbation (the mixing of sediments). This process enhances the oxygenation of sediments, encourages nutrient cycling, and bolsters microbial and invertebrate diversity within the benthic zone. Additionally, such bioturbation fosters the growth of mangrove plants and preserves a healthy sediment structure. The presence and population density of S.serrata can serve as an indicator of ecosystem health, particularly in mangrove and estuarine habitats. Robust populations of S.serrata signify well-functioning mangrove ecosystems.