352 BULLETIN. OF THE BUREAU OF FISHERIES. 
TABLE 9.—MkaN oF Foops EaTEN BY PERCH IN LAKE WINGRA, 1916-17, AND IN LAKE MENDOTA, 
1915-10. 
[Boldface indicates maximum for month and for average; italics, the next largest amount. Figures indicate percentage of food 
by volume; + means a trace.} 
Food. Aug. | Sept. | Oct. | Nov. 
Fish and fish eggs 
Chironomid larvz. 
Corethra larve...... 
Ephemerid nymphs 
Caddisfly larve..... 
Odonate nymphs. 
Sialis larve......... 
Chironomid pup2.. 
Corethra pupe.... 
Corethra adults. .... 
Chironomid adults. . 
Hemiptera adults. . . 
Other insects..... 
Mites. ....... 
& 
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TABLE 10.—LARGEST NUMBER OF VARIOUS SPECIES OF ANIMALS FOUND IN A SINGLE PERCH AS A 
CONSTITUENT OF THE Foop, 1915-16. 
Chief food constituent. 
Size of 
A Per i 
Date. ‘ Other food constituents expressed 
; Tigcaltty pee ne war in per cent of total food. 
meters) Kind. eater total 
food. 
Apr. 22, rors..| Lake Wingra............ 178 |Minnows.......------.- 4 90.0] Fish remains, ro. 
May 8, 1916....| East of Picnic Point, 164 | Chironomus fulviven- 105 30.0 | Mites, 24; crayfish, 35; plant re- 
Lake Mendota. tris larve. mains, 5; débris, 5; mayfly 
nymph, r. 
May 27, ror6...} Lake Wingra............ 133 | Damselfly nymphs... . 45 92.5 | Filamentous alge, 5; plant re 
mains, 2; mayfly nymphs, s. 
Mar. 20, r915..] North of University of 144 | Procladius larve...... 77 45.0 | Aphanothece, 10; Corethra larve, 
Wisconsin, Lake Men- 20; fine silt and débris, 5; plant 
dota. remains, 20. 
June 5, rors... .]..... WOveocnemmanouns crises 172 | Corethra larve........ 150] 100.0 
1 Seeger ge cnc! Booeisededrceranane 162 peolicells uwarowii 40 95-0 | Chironomid cases and larve, 5. 
arve. 
June 12, 1915...]..... GOR cera nae maneneu a 170 | Chironomid pupe..... 300 97-0 | Chironomid cases, 3. rr 
Sept. 4, 19r5....|..... C2 (c PEON eee AE i arti 178 | Camponotus adults....} 1,000 25-0] Insect remains, 5; Chironomus 
decorus pup, 5; Leptodora, 30; 
Daphnia hyalina, 35. 
May 8, 1915....| East of Picnic Point, TO If MILES) to. Me ecteerettcnn 89 24.0 | Chironomus fulviventris larve, 30; 
Lake Mendota. crayfish, 35; plant remains, 5s; 
débris, 5; mayfly nymph, 1. _ 
June 13,1916...) North of University of 35g | eivalellas cc. cse 610 80.0 | Chironomid lary, 2; chironomid 
Blt Lake Men- pupe, 8; caddisfly larve, ro. 
ota. 
Feb. 1, 1916....] Northeast of Picnic 156 | Ostracods............. 59s 93-5 | Corethra larve, 3; Chironomus 
Point, Lake Mendota. decorus larve, 2; Rivularia, o.5; 
plant remains, 1. 
Aug. 28, 1915...| North of University of 162 | Leptodora............. 800 gs-o]| Daphnia hyalina, 2; Corethra 
Wisconsin, Lake Men- adults, 3. 
dota. 
July 24,1915...|..... Gv stkikieratemannnsan 168 | Daphnia hyalina...... 3,644 | 100.0 
Nov. 27, 1915...|...-+ COR r mene ance ook 172 | Amnicola limosa...... 32 27-0] Hyalella, 64.5; Leptodora, 7; 
caddisfly larve, 1; chironomid 
larva, 0.3; filamentous alge, o.2. 
Aug. 28, rors...|..... ( espebscaosneceadcae 160 | Physa heterostropha. . 195 | 99-9] Spartina, o.1 _ § “ 
VithysyxOrs chy cece GOs voi Suc cbacias tare 173 | Spheride............. 119 50-0] Daphnia hyalina, 10; chironomid 
larve, 10; chironomid pup2, 30; 
Amnicola, 1. 
Jan.17,x19r5....|..... (> FRA rene cic oeerioe 186 | Oligochztes........... 20 30-0 | Sialis infumata larve, o.s; fine 
débris, 15; plant remains, so. 
