50 



BULLETIN OF THE BUREAU OF FISHERIES. 



The average length of the fry at the time of hatching is the same as for the Columbia 

 River fish, 35 to 40 mm. The data here presented give only the earlier part of the 

 growth. The rapid rise of the curve during April, May, and June is conspicuous. In 

 comparison with the rate of growth in the Columbia River it is seen that, while the rate 

 itself is approximately the same, the time at which the most rapid gro\\i:h takes place 

 is fully a month earlier. This is, in all probability, due to the fact that, as a whole, the 

 water in the Sacramento Basin is warmer than that in the Columbia River Basin, 

 consequence, the eggs hatch sooner and the growth is somewhat more rapid. 



As a 



Mch. Apr May June July Aug. .Sept. Oct. Nov. Dec. Jan. Feb. Mch. 

 Fr u. Ye g y 1 1 Ti q s . 



Graph 3.— Rate of growth of young cUinook salmon in the Sacramento River Basin. Figures at 

 left of graph indicate length of fish in mm.; dotted line represents probable growth of McCloud River 

 fish. May to July; i, lower part of river; 2; McCloud River. 



The rate of growth in the McCloud River is shown in the following statement and in 



graph 3. 



Growth of Young Chinooks in McCtouD River at B.urd. Length, 



Mm. 



July 24, 1909 ^°' S 



September 24, 1909 9°- 9 



September 18, 1911 93-2 



October 18, 1911 99-2 



November 18, 1911 '°^- 3 



December 18, 1911 ^°'- ^ 



January 22, 191 2 ^°3- o 



February 27, 1912 ^'^- ° 



March 2, 1912 '°9- 6 



