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<br />Species Account - Catostomus catostomus
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<br />Fig. 21. Catostomus catostomus adult (@ Joseph R.
<br />Tomelleri).
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<br />Adult Description: Elongate, cylindrical body with deep caudal
<br />peduncle and no predorsal keel. Long, bulbous, somewhat
<br />pointed snout extending well beyond ventral mouth. Cartilag-
<br />inous ridge along lower jaw but not hard and prominent. Mouth
<br />moderate in size but with large, fleshy, coarsely papillous lips,
<br />not notched at corners; lower lips flaring widely well behind
<br />mouth, medially divided to base or single row of papillae. Dorsal
<br />fin short, not falcate. Pelvic axillary process present but small.
<br />Scales small. Gill rakers relatively few, short, and fleshy.
<br />Fontanelle long and relatively narrow. Peritoneum variable,
<br />silvery or dusky with silvery areas to uniformly black. TL
<br />usually 30--43 cm, up to 64, possibly 76 cm. (Also, Table 6.)
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<br />Reproduction: Non-guarding, open-substrate lithophil.
<br />April through July, probably May to early July in Upper
<br />Colorado River Basin. Migrate at >5 DC. Spawn mostly at
<br />10-15 DC for 1-3 weeks, usually <10 d. Spawn primarily in
<br />small tributary or inlet streams at depths of 15- 30 cm over
<br />gravel with a current of 30-45 cm/sec; occasionally in lakes
<br />over sand, gravel, or rocks at depths of 1.5-76 cm. Eggs
<br />(2.2-) 2.4-3.0 mm diameter, demersal, initially adhesive.
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<br />Young: Hatch in 5-14 days at 18-IODC, remain in gravel
<br />1-2 weeks, then emerge and begin drifting downstream at
<br />10-12 mm TL, usually at night. Young occupy low velocity
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<br />
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<br />
<br />NEW M;~;;;;'
<br />
<br />i--'-,_ ._.;."-'-'--- "-.
<br />\
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<br />Fig. 22. Recent distribution of Catostomus catostomus in
<br />Colorado River Basin.
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<br />shoreline areas in streams or lakes, often with aquatic vege-
<br />tation. Aggregate in top 15 em of water within 2 m of shore.
<br />Those 11-18 mm TL feed on plankton, 20-90 mm graze on
<br />weeds and solid surfaces and feed on larger organisms.
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<br />Table 6. Selected juvenile and adult meristics for Catostomus catostomus. P = principal rays; R = rudimentary rays; D = dorsal; V = ventral.
<br />Scales are lateral series or line when complete. Four added to vertebral count for Weberian complex. Gill rakers for exterior row of first arch,
<br />specimens >70 mm SL. Mean or modal values underlined ifknown and noteworthy; rare or questionable extremes in parentheses.
<br />
<br />Character Original Literature Character Original
<br />Dorsal Fin Rays - P: (9)10-11 9-10-11(12) Dorsal Fin Rays - R: 2-1
<br />Anal Fin Rays - P: 7(8) 7(-9) Anal Fin Rays - R: 2-1
<br />Caudal Fin Rays - P: 18(-20) 18 Caudal Fin Rays - RD: 10-11-12(-14)
<br />Pectoral Fin Rays: 15-16-17(18) 16-18 Caudal Fin Rays - RV: 9-10(-12)
<br />Pelvic Fin Rays: 9-10(11 ) 9-11 Lateral Scales: 103-.!Q2.-11O(l16)
<br />Vertebrae: 46-47 45-47(48) Gill Rakers:
<br />
<br />Literature
<br />
<br />(85-)90-95-115-120
<br />23-30
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<br />Table 7. Size at apparent onset of selected developmental events for Catostomus catostomus, as observed under low power
<br />magnification. P = principal rays; R = rudimentary rays. Scales are lateral series. Rare or questionable extremes in parentheses.
<br />
<br />Event or Onset or Formation Fin Rays First Formed Last Formed
<br />Structure mmSL mmTL or Scales mmSL mmTL mmSL mmTL
<br />Hatched: (7)8-10 (7)8-10 Dorsal- P: 13-14 (14)15 (13)14(15) (15)16
<br />Eyes Pigmented: (7)8 or * 8 or * Anal- P: (13)14(15) (15)16 15-16(17) (17)18-19(20)
<br />Yolk Assimilated: 10-11(12) 10-12(13) Caudal- P: II 11-12 12-13 13-14
<br />Finfold Absorbed: 21-22 26-27 Caudal - R: 13-14 15 21 25-26
<br />Pectoral Fin Buds: * Pectoral: 13-14 15-16 20-21 24-25
<br />Pelvic Fin Buds: 12 13 Pelvic: 14(15) 16-17 (16-)18-19(-21) (19-)22-23(-25)
<br />* before hatching Scales: 27 -28 33-34 (30)31 37-38
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<br />References: Auer 1982, Baxter and Simon 1970, Baxter and Stone 1995, Becker 1983, Beckman 1952, Carlander 1969, Eddy and Underhill
<br />1974, Everhart and Seaman 1971, Fuiman and Witman 1979, Geen et al. 1966, Harris 1962, Hubbs et al. 1943, Jordan and Evermann 1896,
<br />Kayet al. 1994, Lee et al. 1980, Nelson and Paetz 1992, Morrow 1980, Scarola 1973, Scotland Crossman 1973, Simpson and Wallace 1978,
<br />Smith 1979, Smith 1985, Snyder 1981, Sturm 1988, Tomelleri and Eberle 1990, Tyus et al. 1982, Wheeler 1997, Wiltzius 1978, Woodling 1985,
<br />Wydoski and Whitney 1979. Personal Communications: 2001-D. Brauch, P. Martinez, R. Radant, F. Rabel, R. Remmick, R. Schneidervin.
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