Saltwater species are organisms that live in oceanic environments, including fish, mammals, crustaceans, and various types of plants. These species have adapted to the high salinity of seawater, which influences their physiology and behavior. Common examples include sharks, tuna, and coral reefs, each playing a vital role in marine ecosystems. These species are essential for maintaining the balance of oceanic food webs. They contribute to nutrient cycling and provide food for other marine life, including seabirds and marine mammals. Conservation efforts are crucial to protect these species from threats like overfishing and habitat destruction.