Moore. — Study of Trout Diseases. 89 



cious in the treatment of the disease. When they took up the 

 question of the hookworm in the south, again they not only found the 

 org-anism in the intestinal tract and recommended sanitary measures, but 

 they also prescribed a medicine suited to the case. Now, have you 

 scientists done anything along the line of adding medicines to the food 

 of the fishes and noticing their effect on any of the organisms? Of 

 course, the first thing the fish culturist resorts to at the fish hatchery is 

 salt; that is his panacea for all ills. But has anything else been found 

 which would meet the case? Should we stop with locating the organ- 

 ism? Could not medicine be administered with the food? 



Dr. Moore : Nothing of moment has been done yet in the matter of 

 interior medication. The use of salt, which has been regarded by fish 

 culturists as a panacea for everything, has been vastly over-estimated 

 and is of no special value in octomitiasis. The administration of medi- 

 cine to fish that are an inch long, for that is about the size of the ear- 

 liest casualitics, is a difficult and an uncertain proposition, even though 

 it could be administrated with the food. The possibilities of over-doses 

 and under doses, when so administered is a matter to ponder over. 



Mr. Bullock : If it should be true that the organism is transmitted 

 through the egg:, let us cure it in the adult fish and get good eggs; then 

 by employing the prophylactic measures, from the spring on down 

 through the hatchery, we have conquered the trouble, have we not? 



Dr. Moore: We have, optimistically speaking. 



Mr. Hayford: One of our commissioners, when he sends me to 

 these meetings, always asks whether Dr. Moore is going to be 

 there. The last time he said: "I have read Dr. Moore's paper in 

 the last Transactions and it seems to me what we need is more Dr. 

 Moore." In 1917 we started to compare the rainbow, brown and brook 

 trout in waters that were alike. We were in a position to do that be- 

 cause we have six chains of ten ponds, each running on the same water 

 supply. In the course of our operations we have come in contact with 

 the various things that the average fish culturist runs up against; in fact, 

 I believe we have all his problems. We are not always aware of them, 

 Taut now and then they break out and wake us up. In 1917 we started to 

 cari-y our own brood stock. In the case of some of our brook trout we 

 have reached the third generation ; in our brown trout the second 

 generation. 



Not being a scientific man I am simply going to talk as a practical 

 fish culturist, on the basis of observations I have made. The first trouble 

 we ran into was designated by our scientist as Bacterium truttae. We 

 started to study that; we did not eliminate it, but we helped to do it a 

 little bit. The next season we ran up against furunculosis. Neither of 

 these diseases was disturbing to any considerable extent. This year we 

 have both Octomitus and Gyrodactylus. Octomitus was present in the 

 brown and brook trout; of that I am positive. As to the rainbows, I am 

 uncertain. You must understand that I am not an expert microscopist 



