American Fisheries Society. 101 
Mr. Buller: I have followed the cultivation of trout for 28 
years, and I find a parasitic growth frequently attached to the 
trout that are feeding upon liver: while in ponds where the water 
was coming out of the same stream and where I had both suckers 
and trout in the pond, and feeding on fish food, they never 
developed a parasitic growth of any kind. 
Now, while the sucker may be a spawn eater, I think he is 
also a good scavenger; but I have found that the parasitic growth 
very often occurs in liver feeding, especially when the liver is 
partly decayed. 
Mr. Seymour Bower: Some 15 years ago we used to take 
about 2,500,000 brook trout eggs at our Paris hatchery, but 
they began to be attacked by parasites, ulcers, ete., and the 
trout continued to die off. Our stock decreased until the produc- 
tion ran down to about 800,900 per year. We changed foremen 
about six years ago, and now we are getting over one and one- 
half millions per year. Perhaps there may be something in 
that. Try that. 
Mr. Fullerton: We have had some trouble, but it was of 
short duration. [t was our own fault. Our ponds were cons- 
structed of wood. That is where we kept our stock fish always. 
The ponds were allowed to stand there year after year, and when 
I took up the work 10 or 11 years ago, I found that a lot of the 
fish were diseased, especially in the gills, and were dying. | 
said to the man in charge: “I do not believe that these ponds 
are suitable.” “Oh yes,” he said, “they are all right.” But 
Wwe commenced to experiment with them, made cement. sides, 
instead of wood, kept the natural bottom, and noticed the 
difference right off. We eliminated the old stock that were 
diseased, and put in new blood entirely in these ponds, and found 
that the loss decreased nearly 50 per cent in a short time. And 
we found the food had something to do with it. Our man would 
go out in the morning, take a pail of liver, throw it into the pond, 
it would settle to the bottom, become sour, and infect the fish. 
We changed the food and the fish thrived. At the present time 
in both of our hatcheries there is very little loss from parasites. 
Nine or ten years ago we lost nearly every stock fish in the pond 
from parasitic disease, whereas now our loss is less than two 
