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Last modified
7/14/2009 5:02:28 PM
Creation date
5/22/2009 4:43:05 PM
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UCREFRP
UCREFRP Catalog Number
6042
Author
Haynes, C. M., R. T. Muth and T. P. Nesler.
Title
Identification of Habitat Requirements and Limiting Factors For Colorado Squawfish and Humpback Chub.
USFW Year
1985.
USFW - Doc Type
Fort Collins, Colorado.
Copyright Material
NO
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<br />11 <br /> <br />These predictive equations differ fr~m previous equations presented in <br />Haynes et ale (1983, 1984) due to reinterpretation of Hamman's (1981) data <br />and, in general, resulted in a narrowing of previous ranges of estimated <br />spawning dates. The usefulness and accuracy of these equations were <br />discussed in Haynes and Muth (1984). <br /> <br />RESULTS <br /> <br />General <br /> <br />Colorado River Study Area <br /> <br />A total of 1,105 seine and dip net samples were taken in the Colorado <br />River during 1979-1983 (Table 1). Twenty fish species were collected during <br />1981-1983, mostly within the families Cyprinidae and Catostomidae (Table 2). <br />For those years, non-native species predominated, constituting 90%, 82%, and <br />60% of the total catch, respectively. Red shiner (Notropis lutrensis), sand <br />shiner (~. stramineus), and fathead minnow (Pimephales promelas) were the <br />most abundant non-native species and accounted for 79% of all specimens <br />collected during 1981-1983. Mosquitofish (Gambusia affinis), which were <br />uncommon in 1981 and 1982 collections, were more abundant in 1983 and <br />accounted for 18% of all fish sampled. Notably, 11 redside shiner <br />(Richardsonius balteatus) were collected between river km 230.4 and 243.4 on <br />2 May 1981, representing a new distributional record for this species (Haynes <br />et ale 1982). Speckled dace (Rhinichthys osculus), bluehead sucker <br />(Catostomus discobolus), and Gila spp. were the most abundant native species <br />collected, together constituting 16% of the total combined catch for <br />1981-1983. <br /> <br />Table 1. Total number of samples taken in the <br />Colorado, Yampa, and Green rivers, <br />Colorado, 1979-1984. Numbers are <br />combined seine and dip-net samples. <br />Parentheses denote number of drift- <br />net samples taken. <br /> <br />Year Colorado <br />1979 155 <br />1980 114 <br />1981 295 <br />1982 336(48) <br />1983 205 <br />1984 <br />Total 1,105(48) <br /> <br />River <br />Yampa <br /> <br />Green <br /> <br />215 <br />423 <br />295(13) <br />245(252) <br />148(168) <br /> <br />1,326(443) <br /> <br />(155) <br />(155) <br />
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