On the Food of Young Fishes. 
73 
No very small Labracidas were found, the youngest 
being a Morone an inch and a quarter long. Half of the 
food of this consisted of Entomostraca (chiefly Cladoc- 
era), and the other half was minute gizzard-shad. 
A group of forty-three sunfislies (Centrarchidae), from 
five-eighths of an inch to two inches long, was made up 
as follows : — of five specimens of Micropterus under 
three-fourths of an inch long, two Ambloplites of the 
same size, two of Cliaenobryttus from seven- eighths of an 
inch to one inch, one of Apomotis an inch in length, nine 
of Lepiopomus from an inch to an inch and a fourth, nine 
of Eupomotis from one and a half to two inches, five of 
Centrarchus one inch and under, four of Pomoxys from 
three-fourths of an inch to an inch and a half, and six in- 
determinable specimens, probably Lepiopomus, from 
seven-sixteenths to five-eighths of an inch long. Ninety- 
six per cent, of the food of these forty-three specimens 
consisted of Entomostraca and larvae of Chironomus — 
seventy of the first and twenty-six of the second — the 
trivial remainder consisting of Neuroptera larvae and 
young Ampliipoda witli traces of water mites, Corixas 
and mollusks (the last in Eupomotis). The Entomos- 
traca were forty-two per cent. Cladocera, nineteen per 
cent. Copepoda and nine per cent. Ostracoda. 
A single Haploidonotus an inch and an eighth in 
length, had eaten Chironomus larvae (seventy-five per 
cent.) and larvae of Palingenia bilineata. 
Esocidje. 
I did not have the good fortune to obtain any young of 
the common pike, and can only report on the food of a 
single Esox sahnoneus an inch and a fourth in length. 
This specimen, taken at Pekin, 111., on the 2d of June, 
had already begun its life labor of the elimination of 
little fishes, these making about two-fifths of its food. 
The remainder consisted of Crustacea, composed about 
equally of young Ampliipoda, Daphniidae and Lynceidae. 
The presence of so large a quantity of these minute En- 
tomostraca in the stomach of a pickerel of this size, is 
sufficient evidence that they form the principal part of 
its food at an earlier age. 
