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~. eVf' r:f'SO/\j 'iy iA,$ :r- H ().. f 1\ tS [gct2 . , rroM: TouJ'f\oJ 0 P ApfhiP.(~ kw;t eM. (d-w'e ! Vo(oJt\~ I J N~tJ jqq'l Q70LfS , , , : I .\ An Evaluation of Feeds for Raising Razorback S.ucker, Xyrauchen texanus Steven H. Severson Harold M. Tyus G. Bruce 'Haines , , i I I i I I i ~~1 ~~tl,:~ .. ~ , , < ABSTRACT. Razorback sucker fry were raised for 126 days and fed five diets for three time periods: in Phase I fish were fed DioKy- owa-B from day 5 to day 25 (post-hatching); in P~ase 11 (day 26 to day 52), fish were fed either BioKyowa-A, Bio-Dry, AP-I00, or Silver Cup Salmon Starter; during Phase III (days 53-126), fish were fed either BioKyowa-A or Silver Cup Salmon Starter. In Phase I, the fish doubled in body weight and had high sUlVival (96%). In Phase II, BioKyowa A-250 produced better weight gain than. the other rations and higher survival then Silver Cup Salmon Starter. In Phase III, fish fed BioKyowa-A gained more weight than fish fed Silver Cup Salmon Starter, and sUlVival of fish fed Biokyowa-A in Phase II remained high (96.7%) in Phase III. Razorback sucker can be raised successfully for 126 days if BioKyowa B-250is used for the first 25 days, followed by BioKyowa A-250 to day 71 and then BioKyowa A-400 to day. 126. Some spinal and muscular deformities were detected in fish fed all diets, presumably due to vitamin defi- ciencies. These might be reduced by providing extra vitamins or by storing feeds for only short periods. INTRODUCTION The razorback sucker, Xyrauchen texanus, is protected by vari- ous state statutes and is proposed for listing under the Endangered Species Act of 1973 by the U.S. Fish and Wildlife Service (1990). Steven H. Severson, Harold M. Tyus, and G. Bruce Haines, U.S. Fish and Wildlife Service, 1680 West Hwy. 40, rm. 1210, Vernal, UT 84018 USA. Journal of Applied Aquaculture, Vol. 1(3) 1992 @ 1992 by The Haworth Press, Inc. All rights reserved. 55