REPORT OP THE FISH AND GAME COMMIHSION. 



57 



The best results are obtained in planting fry in the smaller tributary 

 streams in spring and summer when there is an abundance of food 

 provided naturally to support fry at that age. In southern California, 

 in the lower altitudes, conditions appear to be somewhat different and 

 a larger fish planted in the fall seems to do the best ; but in the moun- 

 tainous parts of southern California, spring planting has given excel- 

 lent results. 



Fig. 39. Fisli ladder constructed by Northern California Power 

 Company on Butte Creek, Tehama County. Photo- 

 graph by A. E. Culver. 



The planting of fingerlings has an advantage over fry when the fish 

 are planted in large streams or rivers where there are no spawning 

 beds or natural feeding grounds for the fry, such as exist in the smaller 

 streams. These places are not very numerous, as in most river systems 

 suitable tributary streams can be found in which to deposit the fry, and 

 as they develop they work slowly down the streams into the larger bodies 

 of water, following their natural inclinations. 



Some enthusiasts would have us rear the fish until they are almost 

 large enough to catch, before planting. This would be beyond the 



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