The relationship between salinity and aquatic biodiversity is crucial for ecosystem stability. Increased salinity can alter the types of organisms that thrive in aquatic environments. Certain species are adapted to specific salinity levels, and changes can lead to decreased biodiversity, especially in estuarine and coastal regions. High salinity stresses aquatic life, potentially reducing species richness and abundance. Conversely, moderate salinity levels typically promote diverse ecosystems, supporting a variety of flora and fauna, including critical aquatic food webs.