522 REPORT OF THE COMMISSIONER OF FISHERIES. 



but were much freer from mature forms. Two contained a small 

 number of Acanthoccphala, 2 in one fish and 4 in another, and in 

 8 of the 16 were found specimens of Distomuin nodulosum. 



Nearly all of the perch taken in winter and early spring- contained a 

 number of D. nodulosuni^ which were in every case filled with eggs. 

 When the flukes were taken from the fish and placed in water, they 

 would in a few hours invariabh^ burst and a large mass of dark-shelled 

 eggs would drop to the bottom of the dish. The perch caught dur- 

 ing August were not so likely to have this fluke in the cfeca, but man}^ 

 of them contained the small, imnjature fluke in the gall bladder. 



13. lioccus eJirysoj)^, white bass. 



Four specimens were taken in July from Lake Mendota. Three of 

 these were without food, the other contained insect larviB. Parasites 

 were not abundant. Nematodes were present in the stomach of 2 

 and in the intestine of 1 bass, and Acanthocephala were taken from 

 the stomach of a single specimen. Forbes (c, d) found these fish to 

 have eaten maj^-fly and dipterous larvte very abundantly, and in the 

 stomach of one he found a sun-fish. Forbes (c, d) found insect larvoe 

 to be the principal food of the white bass, and also found, in small 

 quantities, fisli and Crustacea. 



BIBLIOGFAPHY. 



Abbott, C. C. Notes on Some Fishes of the Delaware River. Rept. IT. S. Fish 

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Arnold, J. Ueber die Fischnahrung in dem Binnengewiissem. A'erhandhingen 

 des International Congress des Zoologie, Berlin, 1901, pp. 553-556. 



FoKBEs, S. A. (fl) On the Food Relations of Fresh-Water Fishes: A Summary and 

 Discussion. Bulletin Illinois State Laboratory of Natural History, Vol. II. 



. {h) The Food of Fishes: Acanthopteri. Bulletin Illinois State Laboratory 



of Natural Hi.<?tory, Vol. I, No. 3, 1880. 



. [c) The Food of Illinois Fishes. Illinois State Laboratory of Natural His- 

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. (c?) Studies of the Food of Fresh-Water Fishes. Bulletin Illinois State 



Laboratory of Natural History, Vol. II, 1888. 



(e) Food of the Fishes of the Mississippi Valley. Transactions American 



Fisheries Society, Seventeenth Annual Meeting, 1888. 

 Jordan, David S., and Barton W. Evermann. The Fishes of North and Middle 



America. Bulletin U. S. National Museum, No. 47, 1896-1900. 

 Smith, S. I. Food of Fresh-water Fishes. Rept. U. S. Fish Commission for 



1872-73. 

 Ward, H. B. Fish Food in Nebraska Streams. Studies Zoological Laboratory 



L^niversity of Nebraska, 1898. 

 Zaoharias, O. Die mikrosko]3ische Organisnienwelt des Susswassers in ihrer 



Beziehung zur Erniihrung der Fische. Biologisches Centralblatt, XIII, 1893. 

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Vers Poissons d'eau Douce. Archiv de Biologie, V. 1884. 

 . (?;) Die Parasiten unserer Siisswasserfische. From " Die Tier-und Pflan- 



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Centralblatt fiir Bacteriologie und Parasitenkunde XIX, 1896. 



