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water, and location (RK) of each backwater sampled was recorded. In 1979- <br />1981, runs, eddies, side channels and shoreline habitats were also seined. <br />Runs were defined as stretches of the main channel that were relatively <br />deep and fast with laminar flow. Eddies were portions of the stream with <br />distinct counter-current and were usually deeper than adjacent channel. A <br />side channel was defined as a smaller channel in a braided river section <br />that carries appreciable flow during high water. A shoreline habitat <br />consisted of shallow water next to shore. Backwaters were defined as <br />shallow ephemeral embayments adjacent to the main river channel with no <br />measurable velocity. <br />Maximum depth of each backwater was the deepest depth measured during <br />seining, and temperature was recorded at that point. The dominant <br />substrate was classified as silt (< 1 mm), sand (1-3 mm), gravel (3-75 <br />mm), cobble (76-306 mm) and boulder (> 305 mm). In 1988, backwaters were <br />classified as clear (bottom visible throughout), turbid (bottom not <br />visible), and partly turbid (clear at terminal end, turbid at mouth). <br />Backwaters were also sampled in spring (March 30 to May 10) 1984, and <br />1986-1989 to evaluate overwinter survival. Spring sampling was initiated <br />soon after river ice began to break-up. This was usually the first part of <br />April, but ranged between March 30 and May 10. Spring sampling was <br />confined to river reaches known to contain Colorado squawfish (i.e., F, E <br />and B, A). <br />Data analysis.-Larval hatching dates were estimated by back-calculation <br />from TL at capture by use of equations developed by Haynes et al. (1984) <br />and Nesler et al. (1988), where Y= number of days after hatching: <br />Y = - 76.71 + 17.49 TL - 1.056 TL2 + 0.0221 TL3 (for TL < 22 mm) <br />6 <br />