270 Second Annual Report of the 



north of Medina inside of the Shadigee bar. Numerous nests 

 have been found between the bar and the shore, extending to a 

 distance of about one-third of a mile east and west. 



Yearling black bass are sometimes attacked at Cons tan tia by a 

 flagellate of the genus Costia which produces intense redness of 

 the gills and a bluish mould on the region behind the head. They 

 are liable, also, to injury from a parasitic worm whose larvae be- 

 come encysted under the outer skin and form black specks similar 

 to those caused by a distome in the brook trout of certain lakes. 

 This condition of parasitism is especially noted in the Adirondack 

 region where the bass interfere so greatly with the welfare of the 

 trout. According to Dr. Charles C. Trembley, of Saranac lake, 

 it has become necessary to construct dams and screens for trout 

 lakes to prevent the bass from making their way into trout waters. 

 The Lower, Upper and Middle Saranacs, once the most beautiful 

 of trout lakes, are no longer famous for trout, and Long Pond, 

 Hoel pond, Turtle and Slang pond will soon follow unless dams 

 are built, and indeed it may already be too late. Moose pond 

 would have gone long ago had the doctor not kept it dammed and 

 screened except for overflow. 



One of the worst enemies of the black bass in ponds is the 

 common eel, the young of which find their way through the supply 

 pipes and perhaps by crawling around obstructions through the 

 wet grass. 



One of the best natural foods for black bass at the Linlithgo 

 station is the larva of a species of black fly, Simulium venustum, 

 according to Professor Johansen, of Orono, Maine, to whom speci- 

 mens were sent by Professor S. A. Forbes, at our request, for 

 examination. This larva is a ferocious biter and it is believed 

 that some of the cases of poisoning observed among employees of 

 the station were due to this insect. Another species of Simulium 

 found at the Linlithgo station and forming an important part of 

 the natural food supply of the young bass has been identified by 

 Professor Charles A. Hart, systematic entomologist, Frbana, 111., 

 as the Buffalo gnat S. pictijies. The growth of the bass finger- 

 lings has been very greatly hastened by the larvae mentioned. 

 These larvae collect in great numbers on the slashboards of the 

 outlet screen, and the young fish will take them very freely from 



