For purposes of estimating the total migration 

 at these stations the last part of the fry run, 

 i.e., the portion not sampled, was considered 

 to be similar to thelastpart of the run at other 

 streams where complete trapping data were 

 obtained. Furthermore, at these two stations 

 and at Olsen Bay the numbers of fry produced 

 in the intertidal areas were estimated from 

 observations of the percentage of the total run 

 of adults that had spawned in the intertidal 

 area. These assumptions are dubious, and es- 

 timates of the total number of fry presented 

 in table 5 should be used with caution. 



FRY MIGRATION FROM MAJORITY 



OF STREAMS IN PRINCE WILLIAM 



SOUND 



Sample averages were inflated to total fry 

 estimates by multiplying the average migra- 

 tion per stream by the number of streams in 

 the respective strata. The results are sum- 

 marized in table 6. No attempt is made to 

 assign confidence limits to the estimates be- 

 cause of the inherent weaknesses in the 

 sampling program. 



Table 5. — Estimation of total fry production for eight streams, 

 Prince William Sound, 1957 



Stream 



and 

 species 



Fry migrating 

 from above 

 traps 



Fry migrating 

 from inter- 

 tidal area 



Total 



Pigot Bay 

 Pink 

 Chum 



Beartrap Bay 

 Pink 

 Chiffli 



Olsen Bay 

 Pink 

 Chum 



Indian Creek 

 Pink 

 Chum 



Cannery Creek 

 Pink 

 Chum 



Fish Bay 

 Pink 



Whale Bay 

 Pink 

 Chum 



Port Chalmers 

 Pink 



857,000 

 2<i,000 



^ 81,000 

 ^ 36,000 



713,000 

 322,000 



449,000 

 238,000 



1,173,000 

 20,000 



27,000 



352,000 

 ^ 7,000 



300,000 



4,100,000 

 11,000 



^ 9,000 

 2 4,000 



1,^35,000 

 2 648,000 



5,200,000 

 1,200,000 



163,000 

 



11,000 



18,000 

 2 300 



50,000 



'.,957,000 

 35,000 



90,000 

 40,000 



2,1^8,000 

 970,000 



5,649,000 

 1,438,000 



1,336,000 

 20,000 



38,000 



370,000 

 7,300 



350,000 



Estimated from migration patterns of four other middle-run streams (see also table 3), 



The percent of fry emerging from intertidal area roughly es ^imated from percent of 



total run of adults spawning in intertidal area. At Whale Bay this was 5 percent, at 



Olsen Bay 67 percent, and at Beartrap Bay 10 percent. 



16 



