It is possible that by doubling the stocking level, Crystal Lake kokanee reacted by slowing their 

 growth. Second, it is possible that the source of eggs from one or more of those years were from 

 a genetic stock that is slower growing and spawns at a younger age (normally kokanee spawn as 

 three-year-olds in Crystal Take, during the time of smaller kokanee, most were spawning as two- 

 year-olds). In 1993, FWP returned the kokanee plant in Crystal Lake to 50,000 per year (historic 

 levels). Lengths of kokanee have since increased from means of 9.2 to 9.5 inches to 10.7 to 1 1.O 

 inches. In 1994, kokanee were back near historic lengths. 



Currently, anglers fish Crystal Lake and Lavon Lake primarily for kokanee, rainbow trout, and 

 perch. Kokanee are showing signs of increasing lengths and rainbow trout have a good average 

 size and produce good to average catch rates with an occasional large (greater than frve pounds) 

 trout caught. There are some bass in the lake and fishing pressure is pretty light. Yellow perch 

 produce both a spring/summer and winter ice fishery for fair numbers and good sizes (8 to 12 

 inches). 



Manflgpfiiftnt rnnci>rns: 



1. Yellow perch populations are currently at densities high enough to make successful 

 stocking of kokanee difficult. In addition, the signifrcance of competition for food 

 between kokanee and yellow perch is unknown. 



2. Kokanee sizes were 4 to 7 inches below historic lengths, although lengths are increasing, 

 stocking rates appear to impact kokanee growth. 



3. There apparently is some natural reproduction by kokanee in Crystal Lake. The level is 

 currently unknown, making stocking level estimates difficult. 



4. Lavon Lake is known to at least partially winterkill. Nutrients from septic systems may 

 artificially enrich the lakes and aggravate this problem. 



Prefem^ Managpmpnt Option ! 



Managemait q}tions presented included current stocking levels, adjustment of hatchery kokanee 

 plants, and introduction of kamloops (Duncan) rainbow. The lakes received 60 comments. 



Under the preferred management option, Crystal/Lavon lakes would be management primarily as 

 a kokanee salmon fishery. Through monitoring, FWP would identify wild versus hatchery 

 contribution to the population and through adaptive management would adjust stocking rates 

 accordingly. Arlee rainbow trout stocking would continue at current levels and FWP would 

 monitor rainbow trout and adjust stocking densities through the adaptive management provision. 



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