10 



The most important part of the work was finding the rate 



GROWTH, of growth of the young salmon while remaining in the 

 stream. This was determined by capturing series of the 

 fry at intervals and making careful measurements of their length. 



The young salmon were put in the stream on or about the 10th of 

 March, thirty days after hatching, at which time their yolk sacs were 

 absorbed. At this time their average length was 1.35 inches, and the 

 rate of growth is figured from this time. Although the rate of growth 

 could have been determined more accurately had larger series of fry 

 been saved, it is accurate enough to demonstrate a remarkable growth 

 and to enable us to make comparisons between the different streams and 

 different parts of the same stream. It also gives us some idea what to 

 expect in larger rivers. 



The most rapid growth was during the first month, at the end of 

 which time they had, in the lower stream, reached an average length of 

 2.28 inches; a gain for the month of .93 of an inch. A few individuals 

 reached a length of 2.40 inches. 



Through the second month the growth was not quite so great, and 

 during the third and fourth months correspondingly less. At the end 

 of the second month the salmon in the lower end of the creeks averaged 

 2.98 inches in length, and a few had reached a length of 3.1 inches. 



During these first two months the fish in the lower streams averaged 

 considerably larger than those above. At the end of the first month 

 those above averaged 1.71 inches, against 2.28 inches for those below. 

 At the end of the second month those above averaged 2.75 inches 

 against 2.98 below. 



After two months there was no marked difference between the salmon 

 in the lower streams and those above, except in Hatchery Creek, where 

 those above remained very small. 



At the end of four months the average length of the salmon was 3.35 

 inches. The rate of growth during the four months, taken from an 

 average of all the salmon retained, was .52 of an inch per month. After 

 four months this rate of growth fell off very considerably, and at the 

 end of the fifth month they had reached an average length of only 

 3.46 inches. After the middle of the sixth month no more seining was 

 done in the streams until the following February, or eleventh month, 

 when one salmon was found in Olema Creek measuring 3.64 inches. 

 On April 14th, thirteen months after planting, another was found in 

 Olema Creek 4.45 inches long. One other was found in Olema Creek, 

 of which I have no measurements. 



Nearly all the salmon had run out of the streams by the end of the 

 fourth month, and those remaining after this time were evidently 

 stunted individuals, as is shown by their very slow growth. An 

 instance proving this is shown in the following: In March, 5,000 of the 



