FOOD OF THE SHORE FISHES OP CERTAIN WISCONSIN LAKES. 267 



Station 5; August 18; number examined, 3. Lengths: 68.5, 58, 49.5. Food: May-fly nymphs, 20; 

 Corixa adults, 55; Hyalella, 25. 



Station 18; August 18; number examined, 15. Length: Maximum, 64; minimum, 36; average, 46.4. 

 Food: Fish remains, 5.3; chironomid Iarvse,o.6; Chironomusviridis larvEe, i; Protenthes choreus larvse, 

 i.3;CorethralarvEe, 1.3; May-fly nymphs, 0.6; Baetisca nymphs, 4. 3 ; Naucoris nymphs, 2.4; Corixa nymph, 

 0.6; Chironomus viridis pupae, 3; adult midges, 3.3; adult Diptera, 2; Chironomus viridis adults, 2.3; 

 adult Corixas, 0.6; Halictus adults, 0.6; Platyphylax subfasciatus adults, 4; Hyalella, 17; ostracods, 0.3; 

 Diaptomus, 0.4; Cyclops, 7.5; Ceriodaphnia, 21.6; Eurycercus, 0.4; Daphnia longispina hyalLna, 18.6; 

 Bosmina, +; Pleuroxus, -|-; Camptocercus, 0.3; Scapholeberis, -|-; Aphanothece, 0.3. 



Summary. — Food: Fish remains, 5.3; insect larvae, 12. i; pupae, 3; adult insects, 7.4; amphipods, 17; 

 ostracods, 13; cladocerans, 40.9; algae, 0.3. 



Station 8; August 20; number examined, 5. Length: Maximum, 64; minimum, 47; average, 52.6; 

 Food: Probezziaglaber larvae, 0.2; Baetisca nymphs, 12; Ecdyurus maculipennis nymphs, 0.8; Enallagma 

 antennatum nymphs, i; Naucoris nymph, i; Corixa adults, 30.8; Agraylea multipunctata adult, i; Lep- 

 tid adult, 7; Tabanid fly, 3; Hyalella, 29.8; Ceriodaphnia, 8.6; Eiuycercus, 4.4; Aplexa hypnorum, 0.4. 



Summary. — Food: Insect larvae, 14; adult insects, 41.8; amphipods, 29.8; cladocerans, 13; snail, 0.4. 



Station 14; August 31; number examined, 3. Lengths: 44, 42.6, 42. Food: Bstisca nymphs, 15; 

 Caenis diminuta nymphs, 3.3; Chironomus adults, 6.6; Agraylea multipunctata adults, 13.3; Hyalella, 

 26.3; Chydorus sphaericus, 1.6; Ceriodaphnia, ^y, chydorid, 0.3; Camptocercus, 0.3. 



Summary. — Food: Insect larvae, 18.3; adult insects, 19.9; amphipods, 26.3; cladocerans, 35.2. 



Station i; September i; number examined, 2. Lengths: 46, 38. Food: Baetisca nymphs, 16.5; 

 chironomid pupae, 1.5; Chironomus viridis pupae, 6; C. v. adults, 6.5; Hyalella, 1.5; ostracods, 0.5; Chy- 

 dorus, i; Simocephalus, 41.5; Eurycercus, 25. 



Summary. — Food: Insect larvae, 16.5; pupae, 2.1; adult insects, 6.5; amphipods, 1.5; ostracods, 0.5; 

 cladocerans, 67.5. 



Station 29; November 16; number examined, 3. Lengths: 338, 327, 270. Food: Frog, 6.6; fish, 

 33.3; crayfish, 60. 



Grand summary for igi4 and igi^. — Number examined, 78. Length: Maximum, 470; minimum, 

 29.5; average, 66.8. Food: Frogs, 0.2; fish, 8.7; insect larvae, 23; pupae, 3.1; adult insects, 28.1; cray- 

 fishes, 2.6; amphipods, 13.9; ostracods, o.i; copepods, 2.9; cladocerans, 15. i; snails, -|-; oligochaetes, 0.7; 

 leech, 4-; plant remains, 1.2; algae, 0.7; fine debris, o.i. 



The largemouth black bass feeds more on insects and their larvae (34.2 per cent) than anything else, 

 though amphipods (13.9 per cent), entomostracans (18. i per cent), and fish (8.7 per cent) are also taken 

 in considerable quantities. Young individuals eat more small insects and entomostracans than adults. 

 The largest bass examined ate nothing but fish, crayfish, and frogs. Forbes and Richardson (1908) 

 foimd the food of this species to consist of fish and crayfishes. Hankinson (1908) stated that crayfishes 

 and insect larvae are the most important foods. Tracy (1910) mentioned small fish, cra)'fishes, frogs, 

 insects, and all other aquatic animals of suitable size. Reighard (1915) found perch and crayfish in 

 those he examined. 



Notropis heterodon (Cope). Shiner, minnow. 



Data for 1914 are not reliable and therefore not included in this paper. 



Station 17; April 6, 1915; number examined, 10. Lengths: Maximum, 49.6; minimum, 18.7; aver- 

 age, 34.4. Food: Pelopia larvae, 2.5; Chironomus larvae, 13; adult midges, 13; ostracods, i; Cyclops and 

 nauplii, 19.5; Camptocamptus, 4.5; Chydorus, 6.5; cyst, 0.5; rotifers, 9.3; plant remains, 2; filamentous 

 algae, 10; Pleurococcus, 5.9; desmids and diatoms, 0.1; fine debris, 11. 2. 



Summary. — Food: Insect larvae, 16; adult insects, 13; ostracods, i; copepods, 24; cladocerans, 6.5; 

 rotifers, 9.3; plants, 2; algae, 16; fine d6bris, 11. 2. 



Station 17; April 7; number examined, 7. Length: Maximum, 50; minimum, 24.5; average, 34.7. 

 Food: Chironomus larvae, 1.4; adult midges, 2; mites, 10; ostracods, 3; Cyclops, ^i', Canthocamptus, 8; 

 Chydorus, 4; cladocerans, 1.4; ephippial eggs, 4.7; rotifers, 12; Pandorina, 0.6; plant remains, 7; Wolffia, 

 10; filamentous algae, 3.1; desmids and diatoms, 0.1; fine debris, 8.2. 



Suramary. — Food: Insect larvae, 1.4; adult insects, 2; mites, 1.4; ostracods, 3; copepods, 41; cladoc- 

 erans, lo.i; rotifers, 12; plants, 17; algae, 3.8; debris, 8.2. 



