7163 (2) - Laserfiche WebLink

Home Browse Search

0 signals coupled into one ATS receiver. In some cases an underwater antenna, consisting of a 15 m coaxial cable with its copper core exposed at one end and attached to a 4.5 kg lead weight (Niemela and Layzer 1993), was systematically dragged through deep areas (3-5 m) to track fish. The six Colorado squawfish implanted with transmitters in 1992 were tracked from September 1992 through April 1993. Six additional fish were implanted with transmitters in April 1993. These six fish, along with two recaptured fish that were implanted in 1992 were transported upstream of Taylor Draw Dam and Kenney Reservoir (167.8-rkm.) to an area just below the White River and Yellow Creek confluence (198.4-rkm). These fish and the four remaining radio-tagged fish below Taylor Draw Dam were tracked from April through October 1993. The seasonal availability of habitat types used by Colorado squawfish was documented by recording the macrohabitat occupied by all captured fish. In many cases habitat data were collected several times for a particular fish, once for each time it was recaptured or relocated using telemetry. The macrohabitat data A consisted of macrohabitat type occupied, cover, and substrate types (Table Al, A2, and A3 in Appendix). Additional information recorded was river location (rkm), water depth (m), water temperature (°C), and date. Species composition, relative abundance, and distribution were determined from samples taken at the eight sites between Taylor Draw Dam and the Green and White river confluence. All captured fish were counted, identified to species (Table 1), and measured (mm TL). All species composition, population estimate, telemetry, and macro-habitat data were summarized and presented in either tabular or figure format. Telemetry and macro-habitat data were categorized by season (autumn and spring equinox and summer and winter solstice). t 0 0 8 0