258 BULLETIN OF THE BUREAU OF FISHERIES. 



Station 22; April 22, 1916; number examined, i. Length: 120. Food: Chironomid sp. larvae, 

 30; ostracods, 4.8; Cyclops, 24; chydorid, o.i; Chydorus, o.i; plant remains, i; bottom debris, 40. 



Summary. — Food: Insect larvse, 30; Entomostraca, 29; plants, i; debris, 40. 



Grand summary for igis and igi6. — Number examined, 42. Length: Maximum, 460; minimum, 

 15; average 41.7. Food: Insect larvae, 39.7; insect pupae, 6.8; adult insects, 3.5; mites, 1.8; amphipods, 

 6.9; entomostracans, 20.9; snails, 6.9;oligochaetes, 2.8; rotifers, i.i ; protozoans, + ; algae, 0.8; plant remains, 

 4.9; silt and debris, 1.5. 



The German carp during its first few weeks after hatching from the egg feeds largely on entomos- 

 tracans and rotifers; after that it turns more to insect larvae. The adult carp is rather omnivorous, but 

 vegetation forms a large part of its food . Forbes and Richardson (1908) stated that the carp eats princi- 

 pally vegetable matter, also insect larvae, crustaceans, molluscs, and other small aquatic animals. 

 Tracy (1910) said it is omnivorous and chiefly vegetarian in its diet. Cole (1905) stated that the food was 

 mostly vegetable and mentioned many other things he found, including the eggs of whiteflsh. 



Esox lucius Linnaeus. Common pike, pickerel. 



Station 17; April 17, 1915; number examined, i. Length: 730. Food: Micropterus sahnoides 

 (165 mm. long), 55; Perca flavescens (160 mm.), 45. 



Station 17; April 25; number examined, i. Length: 765. Food: Perca flavescens (185 mm.), 100. 



Station 15; June 12; number examined, i Length: 164.3. Food: Perca flavescens (95 mm.), 100. 



Station 23; July 23; number examined, i. Length: 143. Food: Diamesi waltii adult, 5; Hya- 

 lella, 95. 



Station 15; June 26; number examined, i. Length: 420. Food: Fish remains, 100. 



Station 15; August 7; number examined, i. Length: 155.5. Food: Fish remains, 90; Sphse- 

 ridae, 10. 



Station 15; August 21; number examined, i. Length: 587. Food: Perca flavescens (134 mm.), 

 100. 



Station 17; August 23; number examined, 2. Lengths: 362, 400. Food: Perca flavescens (140 

 mm., 105 mm.), 100. 



Station 17; August 24; number examined, i. Length: 317. Food: Fish remains, 90; Corixa 

 nymphs, 4; Naucoris larvae, 4; ephippial eggs, 2. 



Station 28; September 17; number examined, 4. Length: Maximum, 555; minimum, 455; aver- 

 age, 487. Food: Small sunfish, 50; fish remains, 50. 



Station 29; November 16; number examined, 2. Lengths: 876, 563. Food: Perca flavescens (200 

 mm.), 50; fish remains, 50. 



Station 22; April i, 1916; number examined, i. Length: 233. Food: Fish remains, 100. 



Station 18; April 13; number examined, 4. Length: Maximum, 238; minimum, 200; average, 

 217.5. Food: Fish remains, 100. 



Station 18; April 17; number examined, i. Length, 227. Food: Notropis heterodon and other 

 fish remains, 100. 



Station 18; April 18; number examined, 2. Lengths: 293, 203; average, 248. Food: Chydorus, 

 so; leech, 50. 



Station 27; May 30; number examined, 2. Lengths: 320, 295; average, 305. Food: Pimephales 

 notatus, 50; Perca flavescens, 50. 



Station 18; June 29; number examined, i. Length: 220. Food: Fish remains, 100. 



Station 18; Jime 12; number examined, i. Length: 45. Food: Minnow, 50; chironomid larvae, 

 20; Caenis diminuta nymphs, 30. 



Station 18; July 7; number examined, 2. Length: Maximum, 100; minimum, 90; average, 95. 

 Food: Fish remains, 50; Perca flavescens, 50. 



Station 17; July 10; number examined, 6. Length: Maximum, 100; minimum, 81; average, 88.8. 

 Food: Micropterous salmoides, 66.6; Perca flavescens, 16.6; Caenis diminuta nymphs, 10; midge 

 pupae, 6.6. 



Grand summary for l()i 5 and igi6. — Number examined, 36. Length: Maximum, 876; minimum, 45; 

 average, 293.4. Food: Fish, 84; insect larvae, 2.9; insect pupae, i; adult insects, 2.5; amphipods, 2.5; 

 Entomostraca, 2.6; Hirudinea, 2.5; MoUusca, 0.2; silt and d6bris, 1.2. 



