The Relation of Mollusks to Fish in Oneida Lake 201 
Two species of fish were examined, Chain Pickerel and 
Pumpkinseed, seven of the former and five of the latter. 
The data from these is indicated below: 
EHsox reticulatus (LeSueur). Chain Pickerel; Grass Pike. 
Nos. 1 to 4, 150 feet from shore, May 15, 1915; 
Nos. 5 to 7, southeast side of lake m 20 feet of water, 
May 4, 1915. The seven fish may be divided into two 
groups, 1 young 117 to 119 mill. long (about five inches) 
and 2 pre-adult 265 to 270 mill. long (nearly 11 inches). 
We find the ratios of these two groups to be as follows: 
Group 1. Young, 117-119 mill. long. All insects. 
Chironomid, larve: and. spupe.. =... --4 95.90 per cent. 
Warmnsel-fivemiym pls! spas =\cis0< ten oe eens 19.00 per cent. 
Mayetigg my mph, ¢ 23:25 -):.0F tpn trae cutats 9.75 per cent. 
Macerated! matter)... 2255 ose coe cto 15.75 per cent. 
Grour 2. Pre-adult, 265-270 mill. long. 
Chironomid lanves\ 40s) ASG? PN: Pees 20 per cent. 
Damnisel fy omy hsy oe 2 fcr anspor dees «oe sys .- 96.66 per cent. 
COMED GLUE? Fa 58 Shes iees siauchs crs ca d- ap sk toe eee 33.304 per cent. 
ISDE ten Ac). seed. cel Lee teins Be. «Pato 10.00 per cent. 
The change from insect to fish and crawfish is noteworthy. 
Comparing the pre-adult with fishes of the same size from 
Oneida Lake, we note that while the latter fed on crawfish to 
the extent of 75 per cent., those from Green Lake had used 
this class but 33.54 per cent. The large percentage of insect 
larvee (56.66 per cent.) used by the pre-adult of Green Lake 
is especially noteworthy. The data from the Green Lake fish 
is as follows: 
GROUP l. 
No. 4 (54). 119 mill long. 
Insecta. 8 chironomid larve ............. 30 per cent. 
4 damsel-fly nymphs (Hnallagma) 25 per cent. 
3 May-fly nymphs (Callibetis)... 20 per cent. 
Macerated matter 274.44): aaee 25 per cent. 
No. 5 (52). 119 mill. long. 
Stomach. 
Insecta. 4 damsel-fly nymphs (Enallagma) 40 per cent. 
15: chironomid: Jarve....-.5....- 
4 chironomid pupe ........... 60 per cent. 
2 Corethra@ larve. ... ..~ «1-12 steree 
Intestine packed with Odonata and chironomid fragments. 
