The Productivity of Fish Food in Oneida Lake 143 



in Table No. 39 where the average number of animals per 

 unit area is indicated for the different depths. The sudden 

 drop from the 1-6 foot to the 6-12 foot area is striking. 

 Beyond the 6-foot contour the decrease is more gradual. This 

 contrast between shallow and deep water is comparable to 

 Petersen's statement that the greatest number of animals of 

 the marine bottom per square unit is to be found in the shallow 

 waters in the vicinity of plants ('11, p. 47). 



Table No. 37. Number of Invertebrates in One Square Meter, 

 Lower South Bay 



