Watch out – ancient fish species coming through! Sturgeon are often called living fossils because they have been swimming on Earth for over 200 million years, or since the early Jurassic period. They are also the largest freshwater fish in North America. These white sturgeon, seen here at the USFWS Abernathy Fish Technology Center in southwest Washington state, are closer to 6 feet in length but can grow to over 10 feet long! Scientists at Abernathy research multiple species of fish to improve c