Pisciculture. 



in a manifest increase of the fish supply in 

 rivers where the produce had been rapidly 

 diminishing, and the benefits which will follow 

 their labours cannot be easily estimated. 



In fish culture, the hatching of the fish is not 

 the only difficulty that has to be overcome. In 

 many places, high dams or waterfalls prevent 

 the fish from ascending the rivers to spawn, 

 and a contrivance, called a fish ladder, has 

 been invented, by which salmon or other sea- 

 going migratory fish can ascend the rivers 

 to fresh spawning grounds. The fish ladder 

 is simply a series of small pools, like steps of 

 stairs, with an opening for the fish to get 

 through, and a place where they can rest 

 before ascending the next step. The invention 

 has proved exceedingly useful, and it has 

 enabled the owners of suitable waters to stock 

 with salmon many rivers and lakes, which were 

 formerly inaccessible to migratory fish. 



