how does dissolved oxygen affect marine life?

Dissolved oxygen (DO) is crucial for the survival of marine life, as it is necessary for respiration in fish, invertebrates, and many microorganisms. Low levels of dissolved oxygen can lead to hypoxia, which can cause stress, decreased reproductive success, and even death in aquatic organisms. Species that are less tolerant of low DO, such as some fish and shellfish, may migrate to other areas, disrupting ecosystems. Overall, adequate levels of dissolved oxygen are essential for maintaining healthy marine habitats and biodiversity.