Table 6. 



--Fry-to-smolt survival estimated on basis of 30-perceut survival from potential egg 

 deposition to fry stage. Little Kltoi Lake, 1954-61 brood years 



Probable total, based on average of 1- to 2-annulus smolt ratio during study. 



In general, the estimated survival in Little 

 Kitoi Lake from egg to smolt was inversely 

 correlated with the potential egg deposition, 

 and hence with the potential number of finger- 

 lings in the lake: survivals to the smolt 

 stage were about 2 percent for years when 

 the estimated egg deposition was more than 

 2 million (1954, 1955, and 1959 brood years), 

 and 4 to 8 percent for the years when potential 

 egg deposition was 1/4 to 1/2 million (1956-58 

 brood years--see table 5). 



The larger fry plantings in Ruth Lake re- 

 sulted in a higher percentage of yearling 

 migrants and less holdover in the lake (table 5, 

 fig. 6). As shown in table 2, the two heaviest 

 plants (5,730 fry per surface hectare in 1958 

 and 22,140 in i960) resulted in the greatest 

 percentage migration of the resulting smolts 

 as yearlings; the two intermediate plants 

 (4,640 fry per hectare in 1956 and 3,440 in 

 1957) yielded proportionally fewer yearling 

 nnigrants; and the smallest plant (2,600 fry 

 per hectare in 1959) resulted in the greatest 

 holdover--the smallest percentage of migrants 

 as yearlings (table 5, fig. 6). 



The plant of about 15,000 fry per hectare 

 in Midarm Lake in 1956 (table 2) resulted 

 in a migration of 39.7 percent of the smolts 

 as yearlings and a holdover for an additional 

 year of 60.0 percent of the migrants (table 5). 

 Ten fish (0.3 percent of the total) migrated 

 from the lake after a residence of 3 summers. 



A sin-iilar comparison in Little Kitoi Lake 

 does not show such well-defined correlations 

 (table 5, fig. 6). The difference is probably 

 to Sonne degree apparent and due to the lack 

 of data on potential egg-to-fry survival. 



Curves representing the number of smolts 

 produced per hectare in Little Kitoi and Ruth 

 Lakes fronr\ various fry- recruitment densities 

 are shown in figure 7. Again a 30-percent 

 average egg-to-fry survival is arbitrarily 



Figure 6. — Age composition of migrating sockeye smolts 

 by brood year, Little Kitoi and Ruth Lakes, 1954-59 

 brood years. 



