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<br />dion
<br />lilts;
<br />rate,
<br />
<br />anal fin rays 7; caudal long and broad, manY rudimentary rays; scales 14 to 16,
<br />70-86, 13 or 14.
<br />Color, plain olivaceous fading to whitish on belly; head and
<br />hump usually quite dark. , .
<br />The Humpback Sucker is found only in the Colorado drainage.
<br />Specimens 20 inches long weigh about 5 pounds. It is reported to
<br />grow to a weight of 8 to 10 lbs., and a length up to 30 inches. Little
<br />life history information is available. It spawns in the spring when
<br />temperature of the water reaches about 600 F. Spawning takes place
<br />over silt, sand or graveled bottoms.
<br />
<br />The Minnows
<br />
<br />Family CYPRINIDAE
<br />
<br />Body with cycloid scales, head naked; farm varied, elongate and subfu-
<br />siform, more or less compressed, or sometimes thin and deep; pelvic abdominal;
<br />Weberian apparatus present; no adipose fin; brar,chiostegals always 3; margin
<br />of upper jaw formed by premaxillaries alone; jaws toothless; lower pharyngeal
<br />bones well developed, falciform, and nearly parallel with gill arches, each armed
<br />with 1 to 3 series of teeth, 3 to 7 in main row, and a lesser number, in, the
<br />crhers; stomach without appendages; air bladder typically present and with an
<br />open duct, commonly divided into two more or less distinct chambers.
<br />This family is represented by 15 genera in Colorado waters.
<br />
<br />tied
<br />tto
<br />eed.
<br />
<br />KEY TO THE GENERA OF CYPRINIDAE
<br />
<br />IDry
<br />
<br />1 a. Corsal fin with long base, mare than I 5 rays; dorsal and anal
<br />fins each with strang, toothed spine an anterior edge.
<br />20, Upper jaw with 2 barbels on each side ____ __Carps, Cy"riftllS, Page 38
<br />2b. Upper jaw without barbels ____________Goldfishes, Carassias, Page 40
<br />lb. Col'!al fin with short base, fewer than 12 rays; no spines in anal
<br />or dorsal fin.
<br />30. Cartilaginous ridge of lower jaw very prominent and separated
<br />fram lower lip by definite groove; intestine spirally looped about
<br />air bladder ___ n__.._____________Stonerollers, CampostolllG, Page 62
<br />3b. Cartilaginous ridge of lower jaw not prominent and not sepa.
<br />rated from lower jaw by definite groove; intestine not wound
<br />around air bladder.
<br />40. Intestinal canal elongate, usually more than twice length of
<br />body; teeth in I row, with well-developed grinding surface.
<br />Sa. Teeth 5-5 or 5-4; scales moderate to small, 75-110.
<br />60. Barbel at each side of mouth .__ ___ Tenehes, Tinea, Page 40
<br />6b. No barbels on mouth__ ____Redbelly Dace, Chrosomvs, Page 4,5
<br />Sb. Teeth 4-4; scales large 35-50; dorsal fin origin nearly
<br />middle of body.
<br />70. First (rudimentary) ray of dorsal fin slender, firmly at-
<br />tached to first developed ray; scale rows before dorsal
<br />12_16___________Bluntjawed Minnows, Hybognathus, Page 59
<br />7b.. First (rudimentary) ray of dorsal fin somewhat enlarged
<br />and 'blunt, connected by membrane to first developed
<br />ray; scales before dorsal crowded, 22-25 rowL_______
<br />___________________ Fathead Minnows, Pimephales, Page 61
<br />4b. Intestinal canal short, less than twice body length; teeth in
<br />1 or 2 rows; teeth hooked, grinding surface narrow, or rudi-
<br />mentary.
<br />. 80. Maxillary without a barbel.
<br />90. Abdomen behind pelvics never sharply keeled, but
<br />rounded and fully scaled.
<br />100. Scales in laterol line mare than 54.
<br />
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