Aquatic species are organisms that live in water, including oceans, rivers, lakes, and ponds. These species can be classified into two main groups: marine species, which inhabit saltwater environments, and freshwater species, which thrive in freshwater ecosystems. Examples of aquatic species include fish, amphibians, crustaceans, and various types of plants. Aquatic species play a crucial role in maintaining the health of their ecosystems. They contribute to food webs, provide habitat for other organisms, and help regulate water quality. Protecting aquatic species is essential for biodiversity and the overall balance of aquatic environments, such as coral reefs and wetlands.