50 



BULIyETIN OK 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 growth takes place 

 is fully a month earUer. 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. As a 

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



no 



100 

 90 

 80 

 70 

 60 

 50 

 40 

 30 

 20 

 10 







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



Fr u. Ye g y 1 1 « q s . 



Graph 3.— Rate ol growth ot young cliinook salmon in the Sacramento River Basin. Figures at 

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

 fish. May to July; i, lower part ot river; 2; McCloud lUver. 



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



graph 3. 



Growth of Young Chinooks in McCloud River at Baird. Length. 



Mm. 



July 24, 1909 ^^-5 



September 24, 1909 9°- 9 



September 18, 191 1 93-2 



October 18, 1911 99-2 



November 18, 191 1 lo^- 3 



December 18, 191 1. loi- 2 



January 22, 1912 i°3- o 



February 27, 1912 m- 6 



March 2, 1912 log. 6 



