Because taimen (pronounced TIE-men) live in such remote areas, they are little studied, and sport fishing for them is a recent development. The current all-tackle record, a 92 ½-pounder caught in Siberia in 1993, is likely nowhere near the maximum size. There is, for instance, a report of a 231-pound commercially caught fish back in 1943. It is an ancient species, the ancestor of modern salmon and trout, equipped with an oversize mouth lined with rows of small, sharp teeth. And it is belligerence personified, cannibalizing its smaller brethren and happily murdering pike, salmon, grayling, small birds... and prairie dogs.