American Fisheries Society. oa 
one and a half or one and three-quarters wide, and quite regular 
in outline ; and seining was carried on around that lake periodi- 
cally for four months in the shallow water of the entire shore. 
It was seined with a fine-mesh Baird collecting seine during the 
first week of each month for four months, and the character of 
the vegetation over which the seine was hauled each time, was 
noted. The depth of the water, the temperature of the water, 
and different species of fishes, crawfishes and other animals that 
were caught, were examined; and the number of individuals of 
each kind, and the approximate sizes of the individuals of each 
kind, were determined; and particular attention was paid to the 
young of the large mouth and the small mouth, the rock bass, 
and the bluegill, for four species of food fishes found in that 
lake; and my recollection is that where the chara covered 
reaches of the shore, our efforts did not result in capture of as 
many small mouth bass as did those portions of the shore where 
we found Potamogeton, and certain other species of plants. 
Indeed, the Chara-covered part was regarded by those who 
carried on the work, as the barren portion of the lake. We 
would find there certain species of darters in considerable num- 
bers, but neither the large mouth nor small mouth bass was 
found there in considerable numbers. 
Now as to what species of plants are oxygenating and what 
are food-producing, | doubt if you could make any classifica- 
tion that would be of very much value on that basis. All 
aquatic chlorophyll-bearing plants are the same, except in de- 
gree, and as to what the plant will do in those regards depends 
on the time of the day and many other factors. 
Mr. Titcomb: There was no confusion as to the different 
plants, so far as we went through them. They were all identi- 
fied by the chief of the Bureau of Plant Industry, Mr. Covil and 
his assistants, before we made up our minds as to what we liked 
and what we did not, what had good features and what bad. 
I will give you a list of what we considered the best at the 
fish ponds in Washington : 
1. Ceratophyllum demersum. 
2. Cambomba Caroliniana. 
3. Vallisneria spiralis. 
