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Table 5. Data for Young-of-the-year Colorado squawfish (CS) collected from <br />the Colorado River on 1 October 1986 and 23 September 1987. <br />River-mile No. CS Total length Mean TL <br />location collected (mm) (mm) Std. dev. <br />1986 <br />RM 162.6 2 19, 25 22.0 (4.2) <br />RM 158.2 3 23, 28, 24 25.0 (2.6) <br />RTM 155.2 4 24, 27, 33, 23 26.8 (4.5) <br />RM 153.7 20 28, 25, 29, 26, 22 <br />24, 20, 23, 25, 24 <br />25, 20, 29, 23, 24 <br />26, 25, 24, 20, 29 24.6 (2.8) <br />1987 <br />RM 163.2 2 36, 39 37.3 (1.8) <br />RM 154.7 11 22, 26, 35, 28, 24 <br />24, 26, 26, 25, 20 <br />21 25.1 (4.0) <br />collected; this was from a shoreline habitat in the lower 18-mile reach, <br />one mile downstream from WWA (RM 162.7; Fig. 3). The estimated spawning <br />date for this larva was 4 July, about one month earlier than the estimated <br />spawning dates for 1986. Main-channel temperatures warmed earlier in 1987 <br />(Fig. 5) and were similar to those during the estimated spawning period in <br />1986; the minimum and maximum temperatures on 4 July were 17 and 21 C, <br />respectively. <br />No YOY squawfish were collected from the 15-mile reach in 1987. However, a <br />total of 13 YOY was collected from two of the eight backwaters sampled in <br />15