This is the Sakhalin sturgeon, the best picture I could find. The name suggests it's native to the Sakhalin Islands off the east coast of Siberia. It's an endangered species, but more interestingly, it's a sturgeon. Sturgeon are frickin' weird. This species, for example, is most likely octoploid - 8 copies of each chromosome, rather than the more typical 2 in animals. This is based on analyses conducted by Arne Ludgwig and colleagues a few years ago.
Seriously, these fish are wacky in so many ways.
Ludwig A, Belfiore NM, Pitra C, Svirsky V, Jenneckens I. 2001. Genome duplication events and functional reduction of ploidy levels in sturgeon (Acipenser, Huso and Scaphirhynchus). Genetics 158: 1203-1215.