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offers information about managed fish populations throughout the U.S., as well as watershed-based data and state-by-state fishing resources. Learn about freshwater and marine fishes, aquatic invertebrates, water quality and habitats, and dams and fish passage. Fishbase, a global database, provides names, pictures, and key facts about more than 25,000 fish species. (National Biological Information Infrastructure, U.S. Geological Survey)
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![Shortnose sturgeon, Acipenser brevirostrum [Image: US Fish and Wildlife Service National Image Library]](http://free.ed.gov/images/resources/nbii-fish.jpg)