American Fisheries Soctety. 229 
result is what these carp raisers find in Germany, and | should 
think the same principle would hold here. 
Mr. Clark: Are we to understand that the plant life would 
grow more abundantly if the ponds were drained as suggested ? 
Prof. Reighard: That is true of the microscopic hfe but not 
of the chara. 
Mr. Clark: I was in hopes to have a photograph here to 
show how abundant the moss is at Northville. Mr. Titcomb 
asked me to have a picture made of a pond drawn down, showing 
the moss heaped up preparatory to removal. However, the photo- 
graph has not, as yet, been forwarded here. 
Dr. Birge: I would not expect drawing a pond down would 
check chara, but I would not be certain of it. 
Mr. Titcomb: Mr. Fullerton raised the question of removing 
bass from large ponds and placing them in small ponds during 
the winter. That has been the plan adopted in Washington, and 
we have experienced no trouble in confining the adult fish in 
small ponds through the winter, and have kept our large ponds 
dry, thinking it was better for them for the reason Dr. Reighard 
has stated, and in hopes that there was less luxuriant growth of 
plant life as a result. We have a superabundance of aquatic 
plants—and it is to eradicate them. 

Prof. Reighard: When the daphnia and other crustacea be- 
gin to grow in the ponds they increase very rapidly for a certain 
time and then they diminish. It is possible that by using the 
ponds in a certain rotation one might keep up the supply of 
crustacea for a much longer time than by flooding them all at 
one time. The water might be turned into a pond, and when the 
food has appeared there, might be used for the fry and subse- 
quently the water might be turned into another pond and so on. 
