202 Thiiiij-Secoiul Aintual Meeting 



expands and pushes the eye out, the scup being particuhirly 

 adapted to that occurrence. 



Dr. Bean : I did not have that in mind, but it appears to me 

 something- was published a few years ago about a similar condi- 

 tion of trout on Long Island. 



Mr. Marsh: I think iii the report of the New York State 

 Fish Commission for 1897 or 1898 there is a report by Prof. Cal- 

 kins on an epidemic in trout on Long Island, but there was no 

 gas concerned in it. It was due to a protozoan, Lymphospori- 

 dium, which killed the trout iji great numbers. 



Mr. Clark : Prof. Marsh has presented a very interesting 

 paper ; and to confirm what he states there in regard to the aera 

 tion system, taking the air out of the water, I might state a little 

 experience I had quite a few years ago, I think in 1875, 1876 or 

 1877, with some rainbow trout I was transferring from North- 

 ville to Greneva Lake for Mr. Fairbank, of Chicago, the lard man 

 Avho died a short time ago. 



He was spending quite a considerable amount of money in 

 that lake, and Prof. Baird gave him some rainbow trout which 

 were hatched at Northville, and I took them there myself. I had 

 my fish rather thick in the can and was having a little trouble be- 

 fore I reached Cliicago. However, I got them there without any 

 gi'eat loss and immediately hurried my fish to the hydrant at the 

 end of the Illinois Central depot, and paid a boy fifty cents to 

 help me get fresh water to the trout, and I drew out one pail of 

 water and put in a fresh pail, and l)efore I got quarter around the 

 fish were doing badly in the first can, and there were ten cans 

 altogether. They were coming up and turning and making a 

 great fuss. I kept giving them fresh water and my fish kept act- 

 ing badly all the time. I knew there was something wrong, and 

 I immediately commenced drawing the water off and stirring it 

 and putting it back, and in less than an hour and a half I had 

 my fish in good condition. I stopped using Lake ^licliigan wa- 

 ter, and from that day to this I could not account for it; but 

 Prof. Marsh has solved the problem. I knew there was too much 

 air but I did not know why. Deaeration liel])ed them, Init I took 

 the air out of the water instead of putting more air in. 



Mr. Eavenel : Was this fresh water that you put in over- 

 charged with air ? 



