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Freshwater Fish Saltwater Fish refers to aquatic animals that live in either freshwater environments, such as rivers, lakes, and ponds, or saltwater environments, such as oceans and seas. These fish have adapted to their specific habitats and possess unique characteristics that allow them to thrive in either freshwater or saltwater conditions. Examples of freshwater fish include trout, catfish, and bass, while examples of saltwater fish include tuna, sharks, and clownfish. Each type of fish has distinct physical and behavioral traits that help them survive and reproduce in their respective environments.