Guideboats; 



Throughout most of the 1950 season and during the first half of the 

 1951 season two guideboats operated from the West Thumb dock; during the 

 latter half of the 1951 season, only one boat was available at this lo- 

 cation. The guideboats operating from this dock seldom fish in waters 

 outside of the West Thumb (fig. 1). The data furnished by the fishing 

 record books were used as the basis of estimates for the season. Guide- 

 boat estimates are summarized for the two seasons in table 9, 



The application of the "t" test to the grand means of the biweekly 

 means of both seasons for both the rate of effort and catch-per-unit- 

 effort indicated no significant difference between the two years 

 (table 10). 



Table 10 



"t" test of catch-per-unit-effort and 

 effort, guideboat fishery, West Thumb dock, 1950 and 19^1 



Year 



Biweekly means 



Effort 



Grand mean 



1.73ii 



I.li2l4 



2.220 



2.317 



n 



"t" 



d.f. 



7 7 



1.936 

 12 



7 7 



0,666 

 12 



From the evidence presented, the guideboat fishery at West Thumb, 

 like that of Fishing Bridge dock, shows no apparent increase or decrease 

 in the availability of fish. This conclusion, along with that of the 

 rowboat fishery at each of the two docks, would indicate a relatively 

 stable condition of the fishery. The noticeable difference evident in 

 the West Thumb guideboat fishery is the reduction in total numbers of fish 

 taken due to the elimination of one of the boats during half of the 1951 

 season. Had two boats operated from the dock in 195ls the total catch 

 estimate would probably have shown an increase comparable to that of other 

 rental boat fishing activities. 



17 



