BULLETIN OF THE UNITED STATES FISH COMMISSION. 195 



vigor of the larvae will be soonest enhanced, thus enabling them to 

 grow faster, become more vigorous, and the more readily able to escape 

 their enemies. 



IX. — OBSERVATIONS ON THE FOOD OF THE YOUNG JAPANESE GOLD- 

 FISHES. 



Professor Baird, noticing that the young fish in the carp ponds ap- 

 peared to be feeding very actively upon something, requested me to in- 

 vestigate the contents of their stomachs and intestines. On the 6th of 

 June I opened a specimen 30 millimeters long, in the intestine of which 

 I found the following: 



Dirt and particles of quartz- sand: 

 Branchiopoda. 

 Lynceus. 

 Daplmia. 

 Ostracoda. 

 Cypris. 

 Ehizopods. 

 Arcella. 

 Cyphoderia. 

 Eotifers, tests of. 

 Statoplasts of polyzoa. 

 Desmids, several species. 

 Oopepoda; Cyclops, Canthocamptus. 



Woody and vascular vegetable tissue, with spiral bands in the cellular 

 walls. 



Cellulose membranes of the cells of the leaves of Anacharis and Lemna, 

 &c, some still containing chlorophyl, rendering the color of the intestinal 

 contents green. 



Pine pollen. 



Filaments of Spirogyra. 



Palmellaceous algae. 



Diatoms. 



In the stomach of the same specimen I found the following: 



Green spores of algae; some in the zoogloear condition. 



Spirogyra. 



Chitinous remains of dipterous larvae. 



Cyclops, Baplinice, &c. 



Eotifers. 



Also a minute six-legged mite-like creature. 



Stellate hairs from the leaves of some tree in the vicinity. 



In another specimen, besides the foregoing, I found the following : 



Siliceous spicules of a fresh-water sponge. 



Oscillatoriae. 



Ova of Daphnids. 



Hair. 



