National Geographic News Photo Gallery: Taimen's Last Refuge Is Mongolia: "Three taimen line up at the bottom of northern Mongolia's Eg River. The gigantic fish is the world's largest salmonid—the family of fish that includes salmon and trout. The species can live for more than 50 years, but they grow slowly, not reaching maturity until seven to nine years of age, experts say. Taimen migrate to their spawning habitat and can travel as much as 60 miles (97 kilometers) up- and downstream. But scientists using radio and acoustic tagging have shown that the fish generally stay in one place. "
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