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Last modified
7/14/2009 5:02:34 PM
Creation date
5/22/2009 4:43:58 PM
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UCREFRP
UCREFRP Catalog Number
9350
Author
Hawkins, J., T. Modde and J. Bundy.
Title
Ichthyogauna of the Little Snake River, Colorado, 1995 with Notes on Movements of Humpback Chub.
USFW Year
2001.
USFW - Doc Type
Denver.
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 />Evidence leading to the possibility of spawning by humpback chub in the <br />Little Snake River includes the following. Humpback chub occupied habitats in the <br />Little Snake River during their spawning period which occurs between June and <br />July (Kaeding et al. 1990; Karp and Tyus 1990) and when daily temperatures in the <br />Little Snake River from June 21 until July 26 were 180 C (range 14.4-21.20 C) and <br />adequate for spawning. At 19.50 C (range 14.5-230 C) humpback chub captured in <br />the Yampa River were in breeding condition (Karp and Tyus 1990). None of the <br />humpback chub that we captured had secondary sexual characteristics or <br />expressed gametes, but humpback chub with tubercles have been captured in June <br />in the same area of the Little Snake River (Wick et al. 1 991). Stronger evidence of <br />spawning in the Little Snake River would be the presence of ripe humpback chub, <br />especially females, but definitive proof of spawning will require collection of larval <br />or early juvenile humpback chub. We were unable to identify larval Gila beyond <br />genus because there were no adequate morphometric characteristics to distinguish <br />between larval roundtail chub and humpback chub in the small size range that we <br />captured. <br /> <br />Generally we accomplished our objectives for this study. We know what fish <br />species live in the Little Snake River, their distribution, and abundance. We also <br />have a better understanding of the habitat use by endangered Colorado pikeminnow <br />and humpback chub. But several questions remain, especially those regarding the <br />reasons for long-range movements and long-duration stay of humpback chub in the <br />Little Snake River. The predominant remaining question is whether or not <br />humpback chub were attempting to spawn in the Little Snake River. Specific <br />spawning sites have not been identified for humpback chub in the Upper Basin as <br />they have for Colorado pikeminnow and razorback sucker (Xyrauchen texanus), but <br />this knowledge could be crucial for management and recovery of the species. <br />Considering that so little is known about humpback chub reproductive ecology and <br />early life history, we believe that identifying specific spawning sites and describing <br /> <br />23 <br />
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