was made on all Saturdays, Sundays, and holidays. Effort was made to contact as 

 many fishermen as possible. Parties seen but not contacted were recorded daily. 

 In some instances estimates were made of the number of uncontacted or unseen 

 parties. 



Data obtained from fishermen relative to use and yield of the fishery 

 included the number of fishermen in each party, home address, type of fishing 

 (boat or shore), time spent fishing, and number and species of fish caught. Data 

 ordinarily were secured from one member of the party. All the fishermen in one 

 boat or all the occupants of one or more automobiles who fished together were 

 treated as a party. 



Creel data usually were compiled for 2-week periods (1-week periods 

 were used in a few instances) and applied to fishermen observed but not contact- 

 ed and those estimated to be present in the same period of time. Estimates of 

 total use and yield for each check area were based on summation of estimates 

 for the 2 -week periods. 



A few studies — those on Cottonwood Lake, Angostura Reservoir, Harry 

 Strunk Lake, and the 5.5-mile reach of the North Platte River — were limited 

 samplings. These samplings were based on an analysis of several of the inten- 

 sive creel censuses (19)~ . This analysis revealed that coverage could be re- 

 duced to a check of three days, one each month, providing a Sunday or holiday, 

 a Saturday, and a weekday were represented. It was concluded that the error in 

 estimates resulting from such reduced coverage probably would not increase by 

 more than 15 percent any error that might have existed in the estimates derived 

 from an intensive study. 



1/ Parenthetical figures through text and in accompanying tables refer to 

 reference numbers in list of references. 



L 



