Proceedings 89 



"Plainly it would appear that to partly rear this 

 species successfully on a large scale in hatchery waters, 

 it is necessary to hatch a great many more than 

 there is urgent need of. Of course, feeding and occa- 

 sional sorting of sizes will increase the output, and such 

 practice is recommended. Patience, suitable water and 

 sufficient pond area are all that is needed for a satis- 

 factory output. The success of Missouri in this par- 

 ticular respect dates back a number of years, but the 

 results have not been made public." 



Mr. Woods showed a number of bottled specimens 

 illustrating the rate of growth of the large-mouth black 

 bass. 



The demonstration was followed by active discussion 

 on the part of a number of the members. 



Some Quantitative Physiological Changes in the 



Pacific Salmon During the Run to 



the Spawning Grounds. 



By Professor C. W. Greene, 



Laboratory of Physiology, University of Missouri 



(see Transactions, Dec, 1915, pages 5-12.) 



In the absence of Professor Greene, this paper was 

 read by Dr. B. W. Evermann. In the discussion that 

 followed the question was first raised whether the death 

 of the Pacific salmon is due to loss of energy. 



Dr. Evermann: In 1895, and again in 1896, I carried on experiments 

 on Snow River, Idaho, for the two entire seasons, to determine whether 

 the salmon actually died after spawning. We were situated so that we 

 could examine closely every one of several hundred salmon that came 

 to that region. Each of those seasons, not one of those salmon showed 

 any scars or bruises upon arrival at the spawning grounds. They had 

 done no fighting on the way up. When they got on the spawning 

 ground, fighting to some extent and rubbing over the gravel in the beds 

 resulted in some injuries of various sorts, but all of those injuries 

 were received on the spawning grounds. But, although there were 

 no marked changes in the external appearance of the fish from the time 

 it left salt water until it arrived on the spawning grounds, there had 

 been marked change in the muscles and different tissues of the body. 



