The Productivity of Fish Food in Oneida Lake 139 



contour and east of the Lower South Bay area, and between 

 the main land and Dunham Island, where the water gradually 

 deepens to 19 feet. This territory, w'ithin the limits of the 

 map, measures approximately 3,400 by 2,850 feet or 9,690,000 

 square feet. From the 6 dredgings (288 of the 16 square inch 

 units) there were collected 423 mollusks and 79 associated 

 animals or 502 in all (figs. 39-41). This is an average of 1.04 

 mollusks and .27 associated animals which indicates a popu- 

 lation of 91,221,660 mollusks and 23,895,540 associated ani- 

 mals or a total animal population of 115,117,200* (see Table 

 No. 22-c). 



Comparison with Other Localitirs 



Oneida Lake, Survey of 1915. It will be of interest and 

 value to compare the results obtained by the more exact 

 quantitative studies of 1916 w'ith the rougher estimates of 

 191 5. It should be borne in mind that the 1916 survey was 

 conducted in July and the 19 15 survey in September and 

 October (Baker, 'i6a, pp. 121-132). It will be noted that on 

 the average per unit area of 16 square inches the 1916 survey 

 records exceed those of the previous year. Thus for boulder 

 habitats, where the average for 1916 was 4.09, those for 1915 

 were but 2.77. The sand bottom units are 16.51 for 1916 and 

 but 5. II for 1915, a difiference of 66 percent. In the vegeta- 

 tion estimates, however, the 1915 survey records are much 

 greater than those of 1916. The average pond-lily leaf popu- 

 lation per leaf is but 1.65 for 1916 w^hile it was 6.33 for 1915. 

 Again, the submerged vegetation of the 191 5 survey records 

 averaged 89 per cubic column while those of 1916 are but 76 

 for the same area. The comparison shows that the more 

 careful and exact data gathered during the 1916 survey give 

 a far better idea of the quantitative value of the animal life 

 than do the estimates of the previous year. With the more 

 exact data herein presented it will be possible to make com- 



* The computation is as follows : 9,690,000 square feet X 144 square 

 inches = 1,395,360,000 square inches -^ 16 square inches = 87,210,000 

 units, X 1.04 mollusks = 91,221,660 mollusks, and X .27 associated 

 animals = 23,895,540 associated animals. 



