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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 />t <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 />large- and small-bodied fish and varied depending on river access, discharge, <br />habitat, and human safety. Small fish including larvae were collected with seines <br />and dip nets and large fish were collected with seines, trammel nets, hoop nets, <br />angling, and boat- and bank-electrofishing (Table 1). Trammel nets were set in <br />eddies along the eddy-run interface and cleared of fish every 30 minutes. Angling <br />employed baited hooks lworms or crickets), dry-flies, and spoon-type lures. Seines <br />and dipnets were used to sample near-shore areas and backwaters. Angling, hoop <br />net, and trammel net sampling occurred almost exclusively in the lower reach in an <br />attempt to capture rare, endangered fishes for tagging (Table 2). Trammel and <br />hoop nets were not used in the middle reach because of a lack of sites of suitable <br />depth. Boat electrofishing was minimal in the middle and upper reaches because <br />shallow riffles restricted movement. <br /> <br />Fish were grouped as either small-bodied or large-bodied species based on <br />the approximate length at which they become adults. Large-bodied species were <br />those that reach the adult stage at lengths 2..200 mm; small-bodied species were <br />those that reach the adult stage at lengths < 200 mm. Percent composition at <br />each site and in each season was calculated separately for small- and large-bodied <br />fish. For each species, individuals were also partitioned as larvae, juveniles, or <br />adults based on size and morphological development ITable 3). <br /> <br />As part of fish community assessments during baseflow, we intensively <br />sampled two, low-flow, refugia pools with bank electrofishing duplicating <br />techniques and the same site sampled in 1994 (Hawkins et al. 1997). Baseflow <br />sampling included a pool at the upper site IRK 102.2) sampled on September 28 at <br />a discharge of 3.2 m3/sec and another pool at the lower site IRK 5.6) sampled on <br />October 1 at a discharge of 4.8 m3/sec. The upstream site was 130-m long, 23-m <br />wide, with an average depth of 0.8 m and the downstream site was 100-m long <br /> <br />5 <br />
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