An aquatic ecologist is a scientist who studies the relationships between living organisms and their environments in water bodies, such as rivers, lakes, and oceans. They examine how various factors, including water quality, habitat structure, and climate change, affect aquatic ecosystems. Their work helps to understand the health of these ecosystems and the species that inhabit them. Aquatic ecologists often conduct field research, collect samples, and analyze data to assess biodiversity and ecosystem functions. They may work with organizations like the Environmental Protection Agency or collaborate with other scientists to develop conservation strategies for threatened aquatic habitats and species, such as coral reefs and freshwater fish.