252 BULLETIN OF THE BUREAU OF FISHERIES. 



Station 22; April 22; number examined, 10. Length; Maximum, 133; minimum, 112; average, 

 123.4. Food: Chironomus decorus larvae, 3.5; Chironomus sp. larvse, 2; Cricotopus trifasciatus larvae, 

 2.6; May-fly nymphs, 2; chironomid pupae, i; Cricotopus trifasciatus pupae, 1.5; Hyalella, o.i; ostracod, 

 0.2; Canthocamptus, 1.5; Cyclops, 33.8; Daphnia pulex, 19.3; Chydorus sphaericus, 5.1; Bosmina, 1.5; 

 Physa, 2; Oscillatoria, 4.7; flagellates, 0.2; Volvox, 0.7; plant remains, 9; algae, o.i; fine debris, 9.1. 



Summary. — Food Insect larvae, lo.i; insect pupae, 2.5; amphipods, 0.1; Entomostraca, 61.4; Mol- 

 lusca, 2; Protozoa, 0.2; plants, 14.5; debris, 9.1. 



Station 22; June 10; number examined, 5. Length; Maximum, 150; minimum, 115; average, 125. 

 Food; Ostracods, 0.1; Daphnia pulex, 99.9. 



Grand summary for jgi^ and igi6. — Number examined, 59. Length: Maximum, 152; minimum, 

 23.5; average, 67.6. Food: Insect larvae, 4.4; insect pupae, 5.7; adult insects, 2.2; mites, 0.4; amphipods, 

 2.2; Entomostraca, 76.1; rotifers, -f ; protozoans, i; plant remains, 3.1; algae, 1.5; debris, 2.2. 



From these summaries it is apparent that the chief food of the golden shiner was microscopic crusta- 

 ceans (76.1 per cent). More than half the food of 10 of the fish consisted of otlier organisms — 81 per 

 cent filamentous algae, 85 per cent Hyalella, 55 per cent Chironomus lobiferus larvae, 51 per cent silt and 

 fine debris, etc. All other individuals had eaten 50 per cent or more Entomostraca; some had eaten 

 nothing but Daphnia or Bosmina. Forbes and Richardson (1908) state that the food of this species 

 varies greatly in different situations and mention mud, molluscs, insects, entomostracans, and plants 

 as appearing in the dietary. Hankinson (1908) found midge larvae and filamentous algae in the fish he 

 examined. The fish examined by Baker (1916) had eaten a small percentage of molluscs, and about 

 97 per cent insects, chiefly caddis-fly larvae. Considering all things, it appears that when young the 

 golden shiner feeds chiefly on entomostracans, and mature fish on almost any available organisms. 



Ambloplites rupestris (Rafinesque). Rock bass, red-eye, goggle-eye. 



Data for 1914 (Pearse, 1915). — Number examined, 5. Average length: 61.4. Food: Insects, 68; 

 mites, 0.4; Hyalella, 5.6; ostracods, i; Cladocerans, 15; plants, 4; algae, 0.2; silt and ddbris, 0.4. 



Station 15; May 27, 1915; number examined, i. Length: 99. Food; Chironomus fulviventris 

 larvae, 3; C. decorus larvae, 10; Procladius sp. larvae, 10; Molanna uniophila larvae, 69; Ecdyurus maculi- 

 pennis nymphs, 2; Chironomus fulviventris pupae, 5; Valvata tricarinata, i. 



Summary. — Food; Chironomid larvae, 23; caddis-fly larvae, 69; May-fly larvse, 2; chironomid pupae, 

 5; snail, I. 



Station 15; June 9; number examined, I. Length: 115. Food: Siphlurus nymph, 2; Chironomus 

 fulviventris pupa, 3; water mite, 0.5; crayfish, 94.5. 



Station s; June 24; number examined, I. Length; 188. Food; Enallagma hageni and E. anten- 

 natum nymphs, 10; Cambarus propinquus, 90. 



Station 15; July 24; number examined, i. Length; 168. Food; Cambarus propinquus, 100. 



Station 18; July 3; number examined, 19. Length: Maximum, 81; minimum, 35.6; average, 53.6. 

 Food: Chironomus lobiferus larva, 0.7; C. digitatus larvae, i; Cricotopus trifasciatus larvae, 3.1; Pal- 

 pomyia longipennis larvae, 23.1; Leptocerus dilutus larvae, 2.7; Ichythricha larva, 0.1; damsel-fly nymphs, 

 4.2; Ecdyurus maculipennis nymphs, 0.7; Enallagma hageni nymphs, 2.7; E. antennatum nymphs, 25; 

 caterpillar, 1; Chironomus lobiferus pupae, 5.4; Palpomyia longipennis pupae, 5; same, adult, 11. 4; 

 Corixa, 0.7; mites, 0.6; ostracods, 0.3; Eiuycercus, 7.6; oligochaetes, 2.6; filamentous algae, i. 



Summary. — Food; Dipterous larvae, 27.9; caddis-fly larvae, 2.8; damsel-fly nymphs, 32.6; cater- 

 pillar, I ; dipterous pupae, 10.4; adult insects, 12. i; mites, 0.6; ostracods, 0.3; cladocerans, 7.6; oligochaetes, 

 2.6; algae, i. 



Station23; June 14; number examined, I. Length: 45.5. Food; Chironomus tenellus larvae, 100. 



Station 23; July 23; number examined, 5. Length; Maximum, 99; minimum, 61; average, 76.8. 

 Food: Chironomus fulviventris larvae, 17.4; Palpomyia longipennis larvae, 0.4; Caenis diminuta nymphs, 

 8.5; Enallagma antennatum nymph, 7 ; pamid beetle larva, i ; Chironomus fulviventris pupae, 23 ; Tany- 

 pus monilis pupae, 1.8; Palpomyia longipennis pupa, 0.4; Probezzia pallida pupa, 5; Simulium vittatum 

 pupa, 1.8; Corixa adults, 2; Berosus, 3.4; Agabus, 2; Haliplus ruficollis, 2.6; cray^sh, 12.4; Hyalella, 

 6; oligochaetes, 3; seeds, 0.2; Elodea, 2. 



Summary.— Food: Dipterous larvae, 17.8; caddis fly larvae, 8.5; damsel fly nymphs, 7; beetle larva, 

 i; dipterous pupae, 32; adult insect, 10; crayfish, 12.4; Hyalella, 6; oligochaetes, 3; plants, 2.2. 



Station 23; August 19; number examined, i. Length: 66. Food: Carabid-beetle larva, 2; insect 

 remains, 3; plant remaiins, 75; sand, 20. 



