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<br />the species status of larger resident fish. <br /> <br />Refinements of the methodologies used in this study may enhance <br /> <br />the ability to differentiate. Measurement error might be <br /> <br />lessened if larger black-and-white pictures or color slides were <br /> <br />evaluated instead of 3 X 5 photographs. Improvements for the PCA <br /> <br />include shearing to factor out the confounding effect of size on <br /> <br />shape comparisons (Bookstein et al., 1985) and the use of 95% <br /> <br />bivariate confidence ellipses to allow the unambiguous display of <br /> <br /> <br />larger interpopulational data sets (Winans.;:'l11985). PCA of <br /> <br /> <br />modified box-truss morphometric data seems to be a successful <br /> <br /> <br />first step to resolving species questions among the Colorado <br /> <br />River chubs. <br /> <br />1 6 <br />