The Relation of Mollusks to Fish in Oneida Lake 161 
In Georgian Bay, Ontario, Robertson (1915, pp. 98-107) 
reports the following species as having been taken from the 
stomach of the Whitefish: 
Galba emarginata canadensis. Valvata tricarinata. 
Galba palustris. Valvata sincera. 
Physa ancillaria. Musculium securis. 
Bean (1912, p. 273) found three species of mollusks in 
Whitefish caught in Canandaigua Lake, Amnicola limosa, 
Valvata tricarinata, and Pisidium abditum. It is evident 
that the Common Whitefish is a bottom feeder depending 
principally upon mollusks and insect larve for its food sup- 
ply. (See Paul Reighard, 1908, p. 651.) 
Young Whitefish feed principally on entomostracans. 
Hankinson (1914, p. 239) dissected eight specimens and 
found the food to consist chiefly of Bosmina longirostris, 
Diaptomus ashlandi, and Cyclops viridis (var. parcus?). 
Fragments of midge larvee and miscellaneous insects, includ- 
ing winged forms, and filaments of green alge (Ulothrix 
zonata) were also noted. This is another example which indi- 
eates clearly the change of the character of food with the 
age of the individual. Hankinson’s Walnut Lake work also 
indicates a food change coincident with season. 
Leucichthys tullibee (Richardson). Tullibee; Mongrel 
Whitefish. 
Examinations of the Tullibee were very unsatisfactory. 
Five specimens were dissected, the results being as noted 
below. Nos. 1, 2, caught near Constantia; Nos. 3-5 from 
Oneida Lake, but purchased in the Syracuse market and 
caught in November. 
No. 1. 290 mill. long; stomach empty. 
No. 2. 290 mill. long; stomach empty. 
No. 3. 280 mill. long; stomach empty. 
No. 4. 290 mill. long; stomach empty. 
No. 5. 290 mill. long; stomach containing Entomostraca (Clado- 
cera). 
