The anal fin has seven rays, while the dorsal has 13 rays. Recent genetic studies have revealed deep, but morphologically cryptic, population subdivision (about 4.5% sequence divergence) between drainages of the ancient Snake River and the Bonneville Basin.
The anal fin has seven rays while the dorsal fin contains 13 rays. Genetic studies have shown significant but cryptic population differences between drainages of the ancient Snake River and the Bonneville Basin, with a sequence divergence of about 4.5%.