POOD OF THE SHORE FISHES OF CERTAIN WISCONSIN LAKES. 271 



Station 24; September 17; number examined, i. Length: 56. Food: Chironomus digitatus 

 larvse, 95; May-fly nymphs, 5. 



Station 23, in rapids by locks; June 20, 1916; number examined, 2. Lengths: 100 and 98. Food: 

 Simulium larvae, 42.5; diptera pupse, 25; Hyalella, 32.5. 



Grand summary for 1^14, Jgis, and igi6. — Number examined, 27. Length: Maximum, 100; min- 

 imum, 44; average, 72.9. Food: Fish eggs, 27.8; insect larvs, 45.5; insect pupse, 3.7; adult insects, 

 1.7; amphipods, 6.6; Entomostraca, 0.3; leeches, 2; plant remains, 3.4; algae, 1.7; silt and debris, 5.7. 



This summary shows that the log-perch fed mostly on insects and fish eggs. This agrees in part with 

 the results of Forbes and Richardson (igo8), who found that two-thirds of the food was insects, but the 

 other third mostly entomostracans. This fish evidently feeds by choice on the aquatic insects and their 

 larvEe found among vegetation. 



Pimephales notatus (Rafinesque). Blunt-nosed minnow. 



Station 15; November 21, 1914; number examined, 4. Length: Maximum, 32.2; minimum, 2?, 6' 

 average, 27.7. Food; Cyclops, 22.5; Chydorus sphsricus, 2.5; cladoceran fragments, 62.5; filamentous 

 algae, 12.5. 



Station 19; December 3; number examined, 4. Length: Maximum, 30; minimum, 26.4; average, 

 28.4. Food: Chironomid larvae, 25; Cyclops, 10; Chydorus sphaericus, 15; Eurycercus lamellatus, 22.S- 

 cladoceran fragments, 25; diatoms, 2.5. 



Summxiry. — Food: Copepods, 10; cladocerans, 62.5; algae, 2.5. 



Station 23; June 14, 1915; number examined, i. Length: 70. Food: Chironomus tenellus adults, 

 95; Cyclops, 5. 



Station 27; June 17; number examined, 29. Length: Maximum, 62; minimum, 34; average, 46. 

 Food: Orthocladius sordidellus larvae, 9; Probezzia pallida larvae, 2.6; Chironomus lobiferus larvae, 4- 

 C. 1. pupae, 7.1; adult midges, 6; ostracod, +; Cyclops, 0.2; Chydorus sphaericus, 3; Bosmina longiros- 

 tris comuta, 30.7; ephippial eggs, 0.2; Eurycercus lamellatus, 0.5; cladocerans, o.i; filamentous algae, 

 8.2; plant remains, 1.9; fine debris and silt, 24.2. 



Summary. — Food: Insect larvae, 15.6; pupae, 7.1; adult insects, 6; ostracods, -|-; copepods, o.2' 

 cladocerans, 34.5; algae, 8.6; plants, 1.9; silt and debris, 24.2. 



Station 28; June 17; number examined, 10. Length: Maximum, 36.5; minimum, 26.2; average 

 30.2. Food: Chironomid larvae, 19.5; Chironomus lobiferus pupae, 4.1; mite, o.i; ostracods, 0.5- 

 Cyclops, 2.1; oligochaetes, 6; flagellates, 0.1; diatoms, 0.5; Pediastrum, 0.1; filamentous algae, 49.8; 

 plant remains, 0.2; silt and debris, 17. 



Summary. — Food: Insect larvK, 19.5; pupae, 4.1; mite, 0.1; ostracods, 0.5; copepods, 2.1; oligo- 

 chaetes, 6; protozoans, 0.1; algse, 50.4; plants, 0.2; silt and debris, 17. 



Station3; June24; number examined, 3. Lengths: 43,41.7,32.5. Food: Chironomid larvae, 1.7; 

 Orthocladius sordidellus pupae, 1.3; adult midges, 3.3; Chydorus sphaericus, 2.7; oligochsetes, 28; CIos- 

 terium, 0.3; filamentous algae, 50; plant remains, 0.3; silt and debris, 12.3. 



Station 24; July 2; number examined, 2. Lengths: 48.5, 28. Food: Chironomid larvae, 25; 

 chironomid pupae, 25; ostracods, 0.5; oligochaetes, 49; sand, 0.5. 



Station 23; July 3; number examined, i. Length: 58.5. Food: Chydorus sphaericus, i; filamen- 

 tous algae, 60; silt and d(?bris, 39. 



Station 23; July 9; number examined, 4. Length: Maximum, 54.5; minimum, 34; average, 

 44.6. Food: Chironomid larvae, 12.5; Chironomus fulviventris larvae, 0.5; C. tentans larvae, 0.8; Chy- 

 dorus sphaericus, 0.1; oligochffites, 39.9; desmids, 1.2; filamentous algae, 29; silt and dfebris, 16. 



Sujnmary. — Food: Insect larvae, 13.8; cladocerans, 0.1; oligochaetes, 39.9; algae, 30.2; silt and 

 d6bris, 16. 



Station 5; August 18; number examined, 2. Lengths: 41, 35. Food: Chironomid larvae, 5; ostracods, 

 3.5; Cyclops, 2.5; Eurycercus lamellatus, 4; plant remains, 2.5; silt and debris, 82.5 



Grand summary.— NiimheT examined, 60. Length: Maximum, 70; minimum, 23.6; average, 40. 

 Food: Insect larvae, 14.5; pupae, 5.8; adult insects, 4.5; ostracods, 0.3; copepods, 2.6; cladocerans, 25.1; 

 oligochaetes, 7; algae, 19.3; plant remains, 0.9; silt and debris, 20. 



As would be expected from its long intestine, the blunt-nosed minnow eats a good deal of silt, 

 bottom debris, and plants, though entomostracans and insects constitute more than half of its food. 

 Certain individuals had taken foods as follows: Chironomus lobiferus pupae, 100; Bosmina longirostris 



