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<br />it does not accept bait readily (Snyder, 1915). It is easily snared
<br />by pulling grab hooks through a school or amongst a group of
<br />spawning fish. A commercial fisherman on Sahuaro Lake, Arizona,
<br />caught 500 pounds in a day in this fashion in 1949, with a total
<br />Seasonal catch of more than six tons (Hubbs and Miller, 1953).
<br />Humpback suckers have been marketed in the past in the Uppel'
<br />Colorado River and the aborigines of the lower Colorado also ate
<br />them.
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<br />Range
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<br />The humpback sucker occurs in suitable waters throughout
<br />most of the Colorado River drainage, but is generally uncommon
<br />and is becoming increasingly scarce above Grand Canyon. There
<br />are not many Utah records, specimens having been taken from the
<br />Colorado River at Moab, White River near Ouray, and from the
<br />Green River at several places between the town of Green River,
<br />Utah, and Hideout Canyon near the Wyoming border.
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<br />Description
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<br />This large sucker is easily identifIed. except when young, by
<br />the sharp-edged hump on its back, from which it receives its com-
<br />mon name. The structural support for this bizarre keel lies in the
<br />elongation and expansion of the underlying bones (see radiograph
<br />in Hubbs and Miller, 1953, PI. III, Fig. 3). The lateral-line scales
<br />are of moderate size, 68 to 87, the dorsal fin is large, with 13 to 16,
<br />usually 14 or 15, rays, and the gill rakers are numerous, 44 to 50
<br />in specimens over five inches long.
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