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. . might be expected. Mean velocities (also not significantly different in distribution) were lowest at the fish (nose). This suggests that fish were seeking areas of reduced velocity between areas of high velocity. Differences in the distribution of substrates also indicate that the fish may be occupying microhabitats with very different adjacent flow regimes. The resultant HSI curve sets for winter use by adult Colorado'squawfish are presented in Figures 2, 3 and 4. These curve sets represent nose, in, and out measurements, respectively. Each curve set consists of the raw depth data with a smooth fitted curve, the raw velocity data with a fitted curve, and the substrate and habitat histograms. For each set of depth and velocity data, mean, variance, minimum and maximum values are presented, as well as the curve model format and solution, and a set of curve coordinates. . . Razorback sucker. The results of comparisons between 2-hour and 24-hour monitoring are shown in Table A-3 of the Appendix. Depth, velocity, and substrate distributions were significantly different for all comparisons except velocities for nose measurements. This indicates that razorback suckers may utilize habitats slightly different throughout a full day than reflected in the 2-hour sampling. . . The statistical tests for habitat measurements taken at the fish (nose) and one meter either side (in, out) are shown in Table A-4 of the Appendix. No significant differences were found between any distributions for the three sets of tests conducted. This indicates that, in the winter, razorback suckers utilize habitats which are relatively uniform over an area one to two meters 't\U from the fish. This is to be contrasted with the results of the Colorado k squawfish analyses which indicated that this species utilizes small regions of ~\y\\' lower velocity within areas with higher velocity, a phenomenon which is also J.\\-~". reflected in different substrate types. ,~\\A-1- The resultant HSI curves for winter use by adult razorback suckers are presented in Figures 5, 6 and 7. These curve sets represent nose, in, and out measurements, respectively. Each curve set consists of the raw depth data with a smooth fitted curve, the raw velocity data with a fitted curve, and the substrate and habitat histograms. For each set of depth and velocity data, mean, variance, minimum and maximum values are presented, as well as the curve model format and solution, and a set of curve coordinates. . . . . 21 .