32 



BULLETIN OF THE BUREAU OF FISHERIES. 



Fourteen yearlings were taken in the Clackamas River June 8, 191 6, after which 

 date no more yearlings were taken in any of the collections. Nine of these are males 

 averaging 112 mm. in length. The 5 females average 112.6 mm. The scales of all 

 these specimens show the wider rings of the new growth at the margins. The following 

 table (28) gives the data for this collection: 



Table 28. — Chinook Yearungs prom Clackamas River, June 8, 1916. 



FISH FROM THE SACRAMENTO RIVER. 



The young Sacramento River chinooks available for study may be divided into two 

 distinct groups. The first consists of young migrants which were collected by N. B. 

 Scofield, of the California Fish and Game Commission, in the spring of 1911. This was 

 done during the progress of an investigation into the loss of fish resulting from the 

 overflow of the Sacramento during the spring floods. The second group consists of 

 collections made from the McCloud River near the hatchery of the U. S. Bureau of 

 Fisheries at Baird, Calif. These collections were made at the request of Dr. Gilbert 

 during 1911 and 1912. The writer is indebted to both Dr. Gilbert and Mr. Scofield for 

 the privilege of studying these collections. 



The collections of young migrants from the lower part of the Sacramento were 

 made under quite variable conditions and in several localities. Some were made from 

 the river proper and others from the ponds formed by the overflow of the Sacramento 

 during the spring floods. For the most part the collections were small and in several 

 instances were so poorly preserved that many of the specimens had lost all of the scales. 

 Very few of the collections were well enough preserved so that the individuals could 

 be sexed." 



Most of these collections comprise so few individuals that a detailed consideration 

 of each collection would be useless. No unusual results were obtained from a separate 

 study of these smaller collections, and therefore the totals and averages for each have 

 been collected in the following table (29). There are included also, for the purpose 

 of comparison, three collections of young fry from the State hatcheries at Sisson and 

 Brookdale. The few collections which are large enough to deserve more detailed study 

 will be considered later. 



" This poor preservation was in nowise the fault of the collector. The collections had been set aside as valueless several years 

 before the writer found use for them and had received no care during the interval. 



