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approximately 70-100 mm based on length frequencies. Growth of <br />adult suckers was variable but generally slow. <br />LEE'S FERRY FISHERY <br />A stratified creel survey was conducted at Lee's Ferry from <br />January 1984 to May 1986, and past creel records were analyzed. <br />Fishing pressure increased greatly from 1977 to 1983 and then <br />decreased greatly during each year of our study. Catch rates for <br />trout increased from 1977 to 1985 and then decreased in 1986, <br />probably due to a change in fishing regulations. <br />Mean lengths of creeled rainbow trout decreased from 1977 to <br />1985, probably due to lack of stocking from April 1978 to August <br />1980, and higher angler harvest. Mean lengths increased in 1986, <br />yet few large fish were checked at the creel station. <br />There were significant seasonal differences in catch rates <br />for total trout and in mean lengths and condition factors for <br />rainbow trout. Catch rates and mean lengths were greatest during <br />winter coinciding with the rainbow trout spawn. Mean condition <br />factors were lowest during winter. <br />Daily catch rates varied significantly with daily mean <br />flow. Catch rates were highest when mean daily flows were less <br />than 14,000 cfs. Daily catch rates also varied significantly <br />with discharge categories which included effects of both mean and <br />coefficient of variation of daily flow. <br />-8-