BULLETIN OF THE BUREAU OF FISHERIES. 



at which, from an adequate examination of material, the disease is definitely known 

 to exist or to have existed in an advanced stage as expressed by the exhibition of visible 

 tumors. 



District of Columbia. 

 Iowa: Manchester. 

 Maine: Craig Brook, Auburn. 

 Michigan: Paris; North ville. 

 Missouri: Neosho. 

 Montana: Bozeman. 

 New Hampshire: Nashua. 

 New York: Bath; Margaretville 

 hatcheries. 



and other 



Pennsylvania: Spruce Creek; Glen Eyre. 



South Dakota: Spearfish. 



Virginia: Wythe ville. 



Vermont: Roxbury; St. Johnsbury. 



Washington: North Yakima. 



West Virginia: White Sulphur Springs. 



NAMES OF SPECIES AND HYBRIDS. 



While the disease primarily and chiefly is found in the brook trout, it has been 

 observed among all the following species and hybrids in the United States. Two of 

 these, the brown trout and Loch Leven trout, are introduced species, and one the 

 whitefish belonging to a subfamily of the Salmonidae, is not the subject of fish culture 

 as an adult and is represented by only one specimen bearing a tumor, this being a wild 

 fish from a lake. It is quite certain that this list will be much extended as fast as other 

 species of salmonoids are brought under domestication. The single species which, 

 though bred artificially, can not yet be included among the species subject to thyroid 

 carcinoma, is the sea trout (Salmo trutta Linnaeus), introduced into the United States 

 as the Scotch sea trout. 



American brook trout; square-tail trout; redspot trout; 



speckled trout Salvelinus fontinalis (Mitchill). 



Rainbow trout Salmo irideus Gibbons. 



Landlocked salmon; Sebago salmon; Schoodic salmon Salmo sebago Girard. 



Loch Leven trout Salmo levensis Walker. 



Brown trout; von Behr trout Salmo fario Linnaeus. 



Atlantic salmon Salmo salar Linnaeus. 



Great Lakes trout; lake trout; MackinaAv trout; namaycush 



trout; longe; lunge; togue; laker Cristivomer namaycush (Walbaum). 



Humpback salmon. Oncorhynchus gorbuscha (Walbaum). 



Common whitefish Coregonus clupeiformis (Mitchill). 



Hybrid salmon: 



Female silver salmon \ 



Male humpback salmon . . . J 



Female silver salmon 1 



Male chinook salmon f 



Female blueback salmon. .1 



Male humpback salmon . . . J 



Female humpback salmon .1 



Male blueback salmon J 



Female brook trout 1 



Male landlocked salmon . . . J 

 Hybrid trout: 



American brook trout ] 



American saibling or sunapee trout . J " 



jOncorhynchus kisutch (Walbaum). 

 ' \Oncorhynchus gorbuscha (Walbaum). 

 [Oncorhynchus kisutch (Walbaum). 

 '\Oncorhynchus tschawytscha (Walbaum). 

 jOncorhynchus nerka (Walbaum). 

 \Oncorhynchus gorbuscha (Walbaum). 

 JOncorhynchus gorbuscha (Walbaum). 

 [Oncorhynchus nerka (Walbaum). 

 fSalvelinus fontinalis. 

 \Salmo sebago. 



fSalvelinus fontinalis. 

 ' [Salvelinus aureolus (Bean). 



