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14 <br />1967]: <br />Log F= b 1 Log TL - b o <br />where: TL = total body length in millimeters, <br />F = fecundity (mature eggs per female), and <br />bo, b 1 = empirical constants. <br />The regression equations were fitted using the 'STAT PAC' programs <br />available at Utah State University. <br />Age and Growth <br />Scales from razorback and flannelmouth suckers were removed from <br />a key area located midway between the lateral line and the anterior <br />point of the dorsal fin. Scale impressions were made on acetate cards <br />(7.5 cm x12.5 cm x 0.05 mm) using heat and pressure. The impressions <br />were magnified 80x on an Eberbach #2700 projector. A fish age was <br />read two times. If the first and second readings agreed, the age <br />was accepted. If the first two readings did not agree, the age was <br />assessed a third time to assign an age to the fish. <br />Most flannelmouth and razorback sucker scales were difficult to <br />read. Annuli were often indistinct and difficult to locate. Closely <br />spaced circuli and "cutting over" in the lateral fields were the <br />characteristics used to determine the location of annuli. On most <br />flannelmouth suckers' scales, the first annulus was particularly <br />difficult to find. Its location was finally determined from repeated <br />measurements on scales from young of the year and age I fish. The <br />anterior scale radius for each annulus was obtained by averaging the <br />measurements of two scales from each fish. <br />The length-weight relationships for flannelmouth and razorback <br />suckers were best described by the logarithmic equation [Teach, 1971]: