MILNER FISHERIES OF THE GREAT LAKES. 45 



rnerons. At Poiut aux Barques on the north shore of Lake Michigan, 

 where a very large type of the white-fish was found, the stomach-con- 

 tents were entirely of the Mysis relicta Loveu. In the Sault Sainte Marie 

 Kapids in July a mass of small Chrysalides was found in the stomachs 

 of a number of white-fish. In October, from the same locality, the 

 larvie of the caddis-fly were found in the stomachs, apparently carefully 

 separated from their artificial coverings. Stomachs opened in Lake 

 Superior contained principally the Mysidw. 



At Rocky Island, in the northwestern part of Lake Michigan, a vessel 

 with a cargo of wheat was lost a few years ago. The fishermen say that 

 white-fish were taken in that vicinity for several years afterward with 

 wheat in their stomachs. 



Rarely white-fish will take a bait. The breakwater protecting the 

 Illinois Central Railway at Chicago was formerly a favorite fishing- 

 ])lace, and in early summer was often lined with a row of boys and men 

 fishiug for perch. There was seldom a day passed but that a few white- 

 fish were taken. Mr. Trompe, of Sault Sainte Marie, has frequently 

 taken them in that locality with a hook baited with a May-fly, Upheme- 

 rid(c. At a fishing-dock on Sand Island, one of the group of the Apostle 

 Islauds, Lake Superior, there were a few taken this season with a worm- 

 bait. 



The leech, lothyobdella ijunctatd Smith, parasitic on the white-fish, 

 and numerous in some localities, was in no instance found in the stomach. 

 This corroborates Dr. Hoy's observations. 



A similar fact was noticed afterward at Detroit River. A parasitic 

 .crustacean, a Xe/-/ia'(t, was found adhering to the white-fish in numbers, 

 and, though many stomachs were examined, in no instance were any 

 of the parasites found in the contents. 



Both the Lerncea and the Icthyohdella are related to species made use 

 of as food by the white-fish as near in the one instance, as being in the 

 same class, and the other in the same order. 



The mouth is constructed for nibbling along the bottom, the opening 

 being directed nearly downward, and they gather in the small life of 

 the bottom and the gravel as they move slowly along. 



Dredging in the lake at different localities and examination of stomach- 

 contents at numerous points prove that the crustaceans and the mollusk, 

 constituting the principal food of the white-fish, are distributed through- 

 out the lake-bottom, in all localities and at all depths, over about twenty 

 fathoms. 



In Torch Lake, a deep inland lake in the Grand Traverse region, Mich- 

 igan, where a large type of white-fish is found, the dredge brought up 

 the same species of crustaceans and mollusks as were found in Lake 

 Michigan. 



The failure to find food in the stomachs of white-fish has frequently 

 resulted from the fact that the fish examined were taken from the pound- 

 nets, where they had remained long enough to digest the contents of the 



