The aquatic niche refers to the specific environmental conditions and ecological roles that aquatic organisms occupy in marine and freshwater ecosystems. Each species has unique habitat preferences, such as water temperature, salinity, and nutrient availability, that enable it to thrive in its niche. For example, coral reefs support diverse marine life, while freshwater ecosystems host species like trout and catfish. Understanding these niches is vital in aquaculture for selecting appropriate species and designing habitats that mimic natural conditions. By tailoring farming practices to species' ecological requirements, aquaculture can enhance productivity and reduce environmental impact, ultimately supporting sustainable resource management.