FISHES OF GREEN LAKE, WIS. 263 



September 4. — ^Number examined, 3; lengths, 213, 171, iii, average, 165. Food: Crayfish, 66.7; 

 Cambarus virilis, 33.3. 



Summary. — Number examined, 12 (2 empty) ; lengths, 30 to 2 13, average, 134. Food : Insect larvEe, 

 II. 8; insect pupae, 0.6; crayfishes, 64; mites, 4.2; ostracods, 0.2; amphipods, 2.9; entomostracans, 12; 

 sand, 4.2. 



Two-thirds of the food of this species consisted of crayfish. 



Ameitirus natalis (Le Sueur). Yellow bullhead. 



August 2g. — Mouth of Spring Lake Creek; number examined, 2; lengths, 290, 270. Food: Fish, 

 32.5; mayfly nymphs, 10; insects, 17.5; Gelastocoris, 6.5; crajiish, 10; Hyalella, 12.5; Ceriodaphnia, i; 

 plants, 10. 



Summary of food. — Fish, 32.5; insects and nymphs, 34; crayfishes, 10; amphipods, 12.5; entomos- 

 tracans, o.i; plants, 10. 



A third of the food of this species was fish and a third insects. 



Ameiurus nebulosus (Le Sueur), Speckled bullhead. 



August 2Q, IQIQ. — Mouth of Spring Lake Creek; number examined, 9; lengths, 265 to 320, average, 

 302. Food: Mayfly nymphs, 2.8; dragonfly nymphs, i; crayfish, 25.6; cladoceran, o.i; amphipods, 

 0.8; Hyalella, 2.1; Sphaeriidae, 0.6; Planorbis, +; Physa heterostropha, 31.4; oligochsetes, 3; Herbobdella 

 punctulata, 4.2; seeds, 8.9; plants, 10. i; Myriophyllum, 3; filamentous algae, 0.8; unknown d6bris, 5.6. 



Summary of food. — Insect nymphs, 3.8; mites, 0.5; crayfishes, 25.6; amphipods, 2.6; cladoceran, 

 0.1; Sphaeriid£e, 0.6; snails, 31.4; annelids, 7.2; plants, 22; algae, 0.8; unknown, 5.6. 



The favorite foods of this bullhead were snails, plants, and crayfishes. 



Boleosoma nigrtun (Rafinesque). Johnny darter. 



August 20. — Number examined, 5; lengths, 32 to 46, average, 40.2. Food: Chironomus larvae, 

 66; Hyalella, 10; ostracods, 0.2; sand, 23.8. 



August22. — Number examined , i;length,34. Food: Chironomus larvae, 95; sand, 5. 



August 24. — Number examined, i; length, 38. Food: Chironomus larvae, 75; sand, 25. 



August 26. — Number examined, 4; lengths, 37 to 47, average, 41. Food: Chironomus larvae, 92.5; 

 sand, 7.5. 



Summary. — Number examined, 11; average length, i^-i- Food: Chironomus larvae, 82.1; amphi- 

 pods, 2.5; ostracods, 0.1; sand, 15.3. 



Catostomus commersonii (Lacfepfede). Common sucker. 



August 16. — Depth, 14.5 m.; number examined, 2; lengths, 542, 510. Food: Chironomid larvae, 

 23.5; Sialis nymph, 2.5; insects, 0.5; ostracods, i; amphipods, 60; Eurycercus, -f; oligochaetes, 0.5; 

 Sphaeriidae, 6.5; mud, i; sedimentary debris, 4.5. 



August 25. — Depth, 4 m.; number examined, i; length, 364. Food: Chironomid larvae, 4; Lepto- 

 cella larva, i; Hyalella, 2; Sphaeriidae, 76.8; Amnicola, i; Valvaia tricarinata, 0.2; sand, 15. 



Summary. — Number examined, 3; lengths, 364 to 542, average, 445. Food: Insect and larvae, 19-3; 

 amphipods, 40.7; entomostracans, 0.7; clams, 29.9; snails, 0.4; oligochaetes, 0.3; sedimentarj' debris, 3; 

 mud and sand, 5.7. 



The sucker partakes of a considerable variety of foods, the most important being amphipods, little 

 clams, and insects. 



Cyprinus carpio Linnaeus. German carp. 



September 2. — Number examined, i; length, 133. Food: Chironomid larvae, 2; Hyalella, 25; ostra- 

 cods, ^y, Eurycercus, i; Ceriodaphnia, 10; Sphaeriidae, 15; plant remains, 3; fine debris, 10; sand, 2. 



Esox lucius Linnaeus. Pickerel. 



August 16. — Depth, 11.5 m.; number examined, 2; lengths, 553, 576. Food: Shiners, 100. 

 August 18. — Depth, 5 m.; number examined, 2; lengths, 466, 410. Food: Minnows, 50; fish 

 remains, 50. 



August 20. — Number examined, i; length, 402. Food: Fish remains, 70; ostracods, 10; Chara, 20. 

 August 22. — Number examined, i; length 100. Food: Shiners, 100. 



