FIGURE l.— Little Togiak River in relation to 

 the Wood River lake system and the State of 

 Alaska. 



number of smolts migrating during the daylight; 

 6) percent of migration during the daylight; 7) 

 presence of adult sockeye in the river; 8) days after 

 ice-out; 9) river temperature; 10) river depth; 11) 

 light intensity at dusk; and 12) incident solar 

 radiation. 



METHODS 



Description of Study Site 



Little Togiak River is a small nonturbid river 

 located in the Wood River lakes system, Alaska 

 (Fig. 1). River length is about 200 m as it flows from 

 the smaller Little Togiak Lake to the larger Lake 

 Nerka. River width is about 20 m and average 

 depth ranges from about 2 m during spring high 



402 



water to <lm during midsummer. 



Collection of Char Samples 



Arctic char were collected from Little Togiak 

 River from 1976 to 1980. Each year the sampling 

 season began soon after ice breakup (about 7 

 June) and terminated at the end of the smolt 

 migration near the end of July. About 10 char were 

 collected daily during the morning and/or the 

 evening (shortly before and after the peak smolt 

 migration), and their stomach contents were ana- 

 lyzed within 1 h after capture. Information on the 

 size of smolts consumed and on the population size 

 of char at Little Togiak River was collected only in 

 1980. 



Char were collected by fishing with unbaited 



