Table 3. --Estimated pink and chum salmon fry migration from above traps in eight streams, 



Prince William Soimd, 1957 



Percent 



migration 



period 



fished 



Percent 



trap fishing 



time lost''' 



Estimated 



number 



above traps 



100 



^ 34.6 

 ^ 40.1 



100 



100 



100 



100 



"^ 26.3 

 "^ 32.2 



100 



6,8 



7.9 



4.7 



1.0 



857,000 

 24,000 



81,000 

 36,000 



713,000 

 322,000 



4^9,000 



238,000 



1,173,000 

 20,000 



27,000 

 



352,000 

 7,000 



300,000 







Estimated from migration pattern of four other middle -run streams. 

 2 From fry marking and recovery experiments. 

 ■^ From streamflow studies. 

 * Time lost moving, cleaning, and repairing traps. 



hole from under the edges of the trap, forming 

 openings through which fry and eggs could 

 escape or enter. 



6. Fry that were located through excavating 

 may have moved from redds elsewhere, 



7, Excavating gravel with shovels and dig- 

 ging forks was not considered efficient be- 

 cause the work was difficult and time con- 

 suming, and even when personnel worked only 

 for relatively short periods, they became 

 tired and failed to detect all fry and eggs. 



TOTAL NUMBER OF FRY PRO- 

 DUCED IN EIGHT STUDY STREAMS 



The total number of fry produced at Cannery 

 Creek, Pigot Bay, Indian Creek, and Fish Bay 

 can be estimated by adding the upstream 

 (trapped) fry estimates to the intertidal fry 

 estimates (from tables 3 and 4). 



Assumptions must be made regarding Whale 

 Bay and Beartrap Bay data. Fry trapping was 

 discontinued at these stations in midseason. 



14 



