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Triploidy Induction <br />in Largemouth Bass, <br />1Vlicropterus salmoides <br />Gary P. Garrett <br />Matthias C. F. Birkner <br />John R. Gold <br />ABSTRACT. Triploid largemouth bass, Micropteru.s salmoides, <br />were produced by using hydrostatic pressure treatments five minutes <br />after fertilization. Treatments range from 4,000 p.s.i. for 3 minutes <br />to $,300 p.s.i. for 1 minute. All treatments produced triploids. A <br />treatment of 8,000 P.s.i, for 1 minute was best, yielding 100% trip- <br />loids and a relatively low mortality. <br />INTRODUCTION <br />Increasing the number of chromosome sets in organisms has <br />proven beneficial in several agricultural applications, particularly in <br />situations where individuals with extra sets of chromosomes appear <br />to exhibit increased growth potential. Chromosome set manipula- <br />tion has been attempted in several species of fishes, with varying <br />degrees of success (Thorgaard 1983). <br />Most of the work with fishes has involved the induction of trip- <br />loidy, The potential benefits of triploids to aquaculture and/or fish- <br />ery management are numerous. In many studies (Purdom 1972, <br />1976; Valenti 1975; Wolters et at. 1982; Chrisman et al, 1983; <br />Ueno et al. 1986), triploids have been shown to grow faster and <br />Gary P. Garrett, Heart of the Hills Research Station, Texas Parks and Wildlife <br />Department, Ingram, TX 78025 USA; Matthias C. F. Birkner and John R. Gold, <br />Department of Wildlife and Fisheries Sciences, Texas A&M University, College <br />Station, TX 77843-2258 USA. <br />Journal of Applied Aquacutture, Vol. t(3) 1992 <br />© 1992 by The Haworth Press, Inc. All rights reserved. 27 <br />