27 



Before leaving this branch of our subject, it is well to 

 consider the geographical distribution of trout dependent 

 as this is upon the character of the water in diflferent 

 sectipns of the country. 



Trout are found in all rivers in which salmon can hatch 

 their joung, but as they are not necessarily migratory, 

 they often dwell where salmon cannot. Trout require a 

 temperature of water never exceeding 70°. At 68° they 

 begin to suffer ; at 70°, unless there is a strong and broken 

 current to give life to the water, they die rapidly, and 

 not one will survive a temperature of 75°. It is simply 

 manifest then that the Southern and Western rivers are 

 not generally inhabitable for trout or salmon. Trout 

 may be found in the head waters of such as rise in the 

 Alleghany range of mountains, but salmon can exist in 

 none of them. So also with sluggish, muddy rivers of 

 Ohio, Indiana, Illinois, Missouri, and the vast central 

 region of our continent. Throughout the entire section 

 between the AUegliaiiies and Lake Superior and the 

 Northern Mississippi, except in Northern Michigaiij.no 

 trout are found, and then again not till you come to the 

 Rocky Mountains. Trout and salmon, except in the matter 

 of migration, are Similar in their habits. The eggs of 

 either may be hatched in the same boxes, with the same 

 water, in about the same time, and under the same treat- 

 ment. This is being done to-day by the New York 

 Commissioners of Fisheries at the State Hatching House 

 at Caledonia. There are trout, salmo fonimalis, salmon 

 salmo salar, and lake trout sal/mo-confinis, all being 

 hatched side by side in the same building, in identical 

 troughs and with the same water. 



When we speak o't the temperature of a pond or river, 

 allowance must 'be made for springs to which fish will 

 have recourse, precisely as men perishing in a room for 



