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scaleless and scaled portions of epidermis with a caudal peduncle thin but not long snout that <br />overhangs upper lip and scales often minute or absent on keel. Adults are dark on top and light <br />below and fins rarely have yellow- orange pigment near base. Adults usually range from 12 -16 <br />inches long and weigh 3/4 to 2 pounds. The Humpback chub historically ranged in the <br />mainstream Colorado River preferring slower eddies and pools downstream to below the Hoover <br />Dam site. However, present populations are restricted to areas in and upstream of the Grand <br />Canyon. <br />Colorado pikeminnow <br />The Colorado pikeminnow (Ptychocheilus lucius), is a torpedo - shaped fish with an olive -green <br />and gold back, silver sides and white belly. The Colorado pikeminnow is endemic to the <br />Colorado River basin, where it was once widespread and abundant in warm -water rivers and <br />tributaries. Wild populations of Colorado pikeminnow are found only in the upper basin of the <br />Colorado River (above Lake Powell). Three wild populations of Colorado pikeminnow are <br />found in about 1,090 miles of riverine habitat in the Green River, upper Colorado River, and San <br />Juan River sub - basins. The Colorado pikeminnow thrives in swift flowing muddy rivers with <br />quiet, warm backwaters and are primarily piscivorous, but smaller individuals also eat insects <br />and other invertebrates. These fish spawn between late June and early September and when they <br />are 5 to 6 years old and at least 16 inches long. Spawning occurs over riffle areas with gravel or <br />cobble substrate. The eggs are randomly splayed onto the bottom, and usually hatch in less than <br />one week. <br />Razorback sucker <br />The Razorback sucker (Xyrauchen texanus), is brownish -green with a yellow to white - colored <br />belly and has an abrupt, bony hump on its back shaped like an upside -down boat keel. <br />Razorback suckers are found in deep, clear to turbid waters of large rivers and some reservoirs <br />over mud, sand or gravel and like most suckers feeds on both plant and animal matter. <br />Razorback suckers can spawn as early as age 3 or 4, when they are 14 or more inches long. <br />Breeding males turn black up to the lateral line, with brilliant orange extending across the belly. <br />Depending on water temperature, spawning can take place as early as November or as late as <br />June. In the upper Colorado River basin, Razorbacks suckers typically spawn between mid - <br />April and mid -June. <br />Threatened <br />Canada lynx <br />The Canada lynx (Lynx canadensis), is a medium -sized cat with long legs, large, well - furred <br />paws, long tufts on the ears, and a short, black- tipped tail. The winter pelage of the lynx is dense <br />and has a grizzled appearance with grayish -brown mixed with buff or pale brown fur on the <br />back, and grayish -white or buff -white fur on the belly, legs and feet. Summer pelage of the lynx <br />is more reddish to gray - brown. Adult males average 22 pounds in weight and 33.5 inches in <br />length (head to tail), and females average 19 pounds and 32 inches. The lynx's long legs and <br />large feet make it highly adapted for hunting in deep snow. <br />Page 5 <br />