The Prndncthnty of Fish Food in Oneida Lake 145 



Table No. 39. Average Number of Invertebrates per Unit in 

 Relation to Depth 

 Mud Bottom 



Depth 



Mollusks 



Associated 

 animals 



Total 



1-6 feet, 



6-12 feet. 



12-14 feet 



14-18 feet. 



19.44 

 2.07 

 1.88 

 1 . 20 



17.22 



1 .96 



.48 



•32 



36.66 

 4.04 

 2.36 

 I 52 



In the table of general averages per unit area (Table No. 38) 

 it is seen that the sand bottom is the richest in individuals. 

 The relative ^■alues of the different bottoms of Lower South 

 Bay arranged according to number of individuals per unit 

 area is shown in Table No. 40, where number i is of the 

 greatest value. In the areas outside Lower South Bay the 

 sand bottom is again the richest, the boulder bottom being 

 second in numerical value. The richest area inhabited by 

 animals in the region examined in 1916 is the sandy shoal 

 between Dunham and Frenchman Islands. It is noteworthy 



Table No. 40. Average NumberIof Invertebr.\tes per Unit 

 Area of Bottom Lower South Bay {Units 16 square inches) 



Br^ttom 



vSand 

 Sandy clay 



Clay 



Gravel 



Mud 



Boulder. . . 



Total 



Outside Areas {Unit areas of boulders larger than 16 sq. in.) 



1. Sand 



2. Boulder, shoal. . . . 



3. Boulder, shore. . . 



4. Mud, deep water. 



281.36 



146.00 



14 59 

 1.32 



