Biological Survey — Oswego Watershed 



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ones containing browns generally remain there until sometime 

 during the second year after which they migrate downstream. 

 During the second year many of them ranging in size from 6 to 8 

 inches are of legal size for angling. The migrants may or may not 

 permanently leave the stream apparently depending upon the size 

 and summer temperature of the water to which the stream is tribu- 

 tary and the presence or absence of barriers (water falls or serious 

 pollution), the latter preventing their return even if it is otherwise 

 possible. If it is possible for them to return, they do so towards 

 the end of the third and subsequent years in March and April, and 

 at this time may range from 15 to 24 inches long thus furnishing 

 excellent sport. 



Rainbow trout from Seneca lake 



Among the waters in the Oswego watershed known to stop rain- 

 bows in the downstream movement, may be mentioned the Finger 

 lakes (Skaneateles, Owasco, Cayuga, Seneca, Keuka and Canan- 

 daigua), Potters Falls reservoir at Ithaca and Lake Como (Cayuga 

 county). 



The question for the sportsman to ponder is whether to stock any 

 stream irrespective of barriers or the condition of the water info 

 which it empties in the hope of catching a few 6 to 8 inches long 

 and losing the remainder of the plant through migration, or to 

 confine them to streams without barriers which empty into suitable 



