82 Conservation Department 



percentages of the food table of young carp and reveal the selec- 

 tive nature of their food. 



I. Length, 16 mm. Stomach empty. Food in the intestine: Cladocera, 

 10; copepods, 20; ostracods, 00; unidentifiable debris, 10. 



II. Length, 16 mm. Food: Planorbis, 75; ostracods, 7; copepods, 4; 

 mites, 3; algae debris, 1; eggs of snail, 10. 



III. Length, 18.5 mm. Food: Chironomid larvae, 20; ostracods, 10; cope- 

 pods, 30; cladocera, 10; debris, 15; eggs of snail, 15. 



IV. Length, 23, mm. Stomach filled: Ostracods, 25; copepods, 25; 



cladocera, 5 ; debris containing planorbis, 40. 

 V. Length. 2(5 mm. Stomach filled: Parasitized by 5 nematodes in the 

 alimentary tract. Food: Ostracods, 80; copepods, 8; misc.: Arcella 

 mites; insect; cladocera, 12. 



VI. Length, 12 mm. Stomach empty. Copepods, 80; ostracods, 15 

 cladocera, 5. 

 VII. Length, 40 mm. Stomach empty. Planorbis, 25; chironomid larvae, 35 

 ostracods, 10; copepods, 5; insects, 6; Arcella, 1; cladocera, 3; water 

 mites, 5; debris, including Planorbis shell fragments, ostracods, plant 

 fragments, diatoms, Pediastrum, filamentous algae, Eremosphera, 

 sand, 10. 

 VIII. Lenth, 82mm. Weight, 9.5 gm. Stomach empty. Snail shells, 10 

 copepods, 10; seed pods, 15; ostracods, 15; midge larvae, 10 

 cladocera, 10; insect larvae, 5; plant leaf and stem fragments, 5 

 insects, 5; amphipods, 3; fish spine and caudal fin, 3; fish scales, 

 2 ; debris, including shell fragments, 5 ; algae, 2. 



Summary of the food of the eighty-seven young carp ranging 

 from 11 mm. to 112 mm. 



No. of individ- 

 uals containing 

 food in the ali- 

 mentary tract 

 {stomach and 

 Food Item intestine) 



Crustacea fragments 70 



Ostracods 65 



Copepods 61 



Cladocera 39 



Insect larvae 69 



Algae 46 



Snails 31 



Debris 29 



Shell fragments 27 



Worms (Nematode) 16 



Plants (plant leaf fragments) 16 



Mites • 15 



Eggs 



Snail 4 



Insect 5 



Copepod 3 



Rotifers • • • 3 



Clams . 2 



Eleven had the intestinal tract empty. Thus 70 per cent of the 

 76 containing food had eaten some form of Crustacea. 



The individual studies and this table indicate that their food 

 is similar to those found in Casadaga creek* ; and that they com- 

 pete with perch, bass, pumpkinseecls, suckers, bullheads, darters 

 and minnows. 



General Considerations of Carp Control. — The studies on 

 carp control which have been carried on during the past summer 

 furnish new and valuable data upon the life of the carp in a 



Genesee Survey, p. 56, 1926. 



