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<br />PP~'I u~ 61nc!CS I ~CSIS <br />~ Irk 1~8~ <br />vi <br />ABSTRACT <br /> <br />Preferred Temperature of Colorado squawfish (Ptychocheilus lucius) <br />and its Relations ..with Age and Growth Rate <br />by <br />Tamara Black, Master of Science <br />Utah State University, 1982 <br />Major Professor: Dr. Ross V. Bulkley <br />Department: Fisheries and Wildlife Science <br />Temperature preference of Colorado squawfish, Ptychocheilus <br />lucius, was determined for both juvenile and adult fish in a horizon- <br />tal gradient trough. Fish were acclimated to 14, 20, and 26 C, and <br />twenty juveniles and ten adults were tested from each acclimation tem- <br />perature. Acute preferenda (mean of individual modes) were plotted <br />against .acclimation temperature to estimate final preferendum. Acute <br />preferenda of juveniles were 21.9,-27.6, and 23.7 C for 14, 20 and 26 <br />C -acclimated fish, respectively. Acute preferenda of adults were <br />21.5, 22.5, and 25.7-C-for 14, 20, and 26 C -acclimated fish, respec- <br />tively. Adult and juvenile squawfish appear to have the same final <br />thermal preferenc4um, approximately 25 C. <br />Growth rate of juvenile Colorado squawfish was determined over a <br />12-week period at four different temperatures (15, 20, 25, and 30 C) <br />