SALMON DISEASE. TROUT. 13 



when the fish leave the rivers. This fungoid growth, 

 so detrimental to the well being and life of fish, has 

 been termed the salmon disease, which is anything 

 but a correct appellation, seeing that its deadly effects 

 are often even more marked in the case of trout and 

 other fish. This disease is a choleraic disorder, and 

 we are told owes its immediate origin to animal or 

 vegetable substances, one or both, in a state ' of 

 poisonous decomposition in the water. Effectual 

 remedies there would appear to be none. The only 

 safe and efficient remedial course would appear to be 

 to avoid river pollution, and thus purify instead of 

 putrify water containing fish. Occasionally, however, 

 this deadly disorder is found to be rife in waters that 

 cannot have been polluted by any of the numerous 

 impurities to which the waters of populated districts 

 are exposed, and in these instances it may be assumed 

 that the presence of decaying vegetable substances 

 is owing to protracted, unhealthy weather. 



Salmon frequent only the northern and temperate 

 parts of the earth. It is a noteworthy fact that the 

 inhabitants of the more southern latitudes, when 

 mature, are much inferior both as regards size and 

 gameness of disposition this at least in the eastern 

 hemisphere than those of colder regions. In Nor- 

 way these fish are capable of attaining a prodigious 

 size and weight, 80 to 90 Ibs. occasionally ; whilst 

 in the waters of Britain, the adult fish very rarely 

 attain to one half that weight. 



THE COMMON TROUT (Salmo Fario.) For 

 variety of size, colour, and disposition, the brown or 



