9350

• 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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METHODS

Discharge, water temperature, and water quality

Discharge records during the sampling period were obtained from U.S.
Geological Survey gaging station, named "near Lily, Colorado", #09260000 at
RK 15 (Crowfoot et al. 1996). Water quality was measured on four occasions
during runoff and baseflow. Conductivity was measured with a Cole Parmer@,
model TDSTestr 3 meter lrange 1-1990 jJS), pH with a Cole Parmer@, model
pHTestr 2 meter, total hardness with a HACH@ model HA-DT test kit, alkalinity with
a HACH@ model AL-DT test kit, dissolved oxygen with a HACH@ model AL-DT test
kit using a modified Winkler titration method, and light penetration with Secchi
disk.

Water temperature was collected hourly by Ryan data loggers on the Little
Snake River at RK 15 from May 5 through October 28 and on the Yampa River at
Moffat County Road-25 bridge, 2.5 km upstream of the Little Snake River
confluence, from May 5 through October 1. Loggers were checked bi-weekly to
insure they remained submerged as water levels dropped.

Fish community sampling

Fish were collected on six occasions from May 16 to October 1, 1995 using
techniques similar to those employed the previous year IHawkins et al. 1997).
Sampling occurred in the spring and summer during the ascending and descending
limbs of runoff and in autumn during base flow. Sample dates were May 15-18,
June 1-6, June 21-23, July 1-7, July 16-18, and September 27- October 1
(Figure 2). Sampling gear and methods targeted larvae, juveniles, and adults of both