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Last modified
7/14/2009 5:02:32 PM
Creation date
5/22/2009 4:44:13 PM
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UCREFRP
UCREFRP Catalog Number
8006
Author
Hawkins, J. A., E. J. Wick and D. E. Jennings.
Title
Icthyofauna of the Little Snake River, Colorado, 1994 - Final Report.
USFW Year
1997.
USFW - Doc Type
Denver, CO.
Copyright Material
NO
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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />contained yearling (35-60mm) and larger fish (70-100mm, estimated Age 2 +), <br />confirming reproduction the previous two years. <br /> <br />Flannelmouth sucker spawned in early May based on collection of 14 adults <br />with spawning tubercles including nine males and two females that expressed <br />gametes. Adult flannel mouth sucker caught on later trips did not have secondary <br />spawning characteristics. Early June collection of flannelmouth sucker larvae <br />confirmed May spawning (Appendix Figure C.2). Yearling-sized flannelmouth <br />sucker juveniles collected from May through July confirmed 1993 spawning, <br />overwinter survival, and retention of young flannel mouth sucker within the Little <br />Snake River. <br /> <br />Bluehead sucker spawned in early to mid May. Of 22 adult bluehead sucker <br />collected on May 14, 68% had breeding tubercles including four males and two <br />females that expressed gametes. After May, adult bluehead sucker had no <br />secondary spawning characteristics and larvae were abundant in all collections <br />(Appendix Figure C.4). Juvenile and yearling-sized fish (25-60 mm) collected from <br />May through July confirmed spawning in 1993, overwinter survival, and retention <br />of larval blue head sucker within the Little Snake River. <br /> <br />Speckled dace spawned in early June, based on fish collected in spawning <br />color and expressing milt and based on larval collections in mid June and July <br />(Appendix Figure C.4). Mottled sculpin spawned in Mayor June based on larvae <br />collected in early June. <br /> <br />Few nonnative species were collected in spawning condition, but a 60-mm <br />redside shiner in brilliant spawning color and a sand shiner expressing milt were <br />both collected on June 9. Red shiner, fathead minnow, and white sucker adults <br />were rarely collected, but a few larvae of each species were collected, indicating <br />some reproduction in 1994 (Table 2). White sucker spawned in late May based on <br /> <br />17 <br />
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