Table 17 

 Results of Yellowstone River census, 1951 



Fisherman Average Catch-per- 



Year Fishermen Hours Total catch effort fisherman-hour 



1951 113,891 83,6li| 19,729 0.73 0.21; 



As explained in the analysis of the shoreline census for 19^1, the 

 number of fishermen is not truly representative of the actual number of 

 fishermen. It is, however, an estimate of the number of fishermen 

 staying in one place and angling as long as was demonstrated by the com= 

 plete censuses for each two-week periodo Assuming the average total 

 fishing time in the 1952 season is no different from that of 1951, this 

 number can be adjusted from the results of futiire censuses so that it is 

 more representative of the actual number of anglers. The number of fish- 

 ermen as calculated for 1951 for the river fishery is probably more 

 divergent from the true number than is that for the lake shore. The 

 anglers on the river tend to keep moving along the river bank more than 

 do those along the shoreline; thus the average effort demonstrated by 

 the complete census for the river fishery is considerably smaller than 

 that of the shoreline, 



A summary of the 195l estimates of hours of effort and of catch for 

 the Yellowstone River fishery is shown in table 18, Variance estimates 

 are subject to the same lirritations as discussed under the shoreline 

 fishery , 



28 



