Fish can be found in a wide variety of habitats, including freshwater rivers, lakes, and streams, as well as saltwater oceans and seas. Some fish species also inhabit brackish water environments, which are a mix of freshwater and saltwater. Fish can be found in a range of temperatures, from cold Arctic waters to warm tropical reefs. They can also be found in different depths of water, from shallow coastal areas to the deep sea. Overall, fish are incredibly diverse and adaptable creatures that can thrive in a wide range of habitats.