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<br />12 <br /> <br />Statistical analysis <br /> <br />Student's t test was used to test the difference between two <br /> <br />means for a variable. Analysis of variance was used to test for <br /> <br />differences in average fish velocities among the three flow lev- <br /> <br /> <br />els. Fisherls (Ott 1977) least significant difference was used <br /> <br /> <br />to test between paired means where analysis of variance indicated <br /> <br />a significant (P < 0.05) difference among flows. <br />