MAKING A FISHERY. 



Working up 

 streams to 

 spawning 



grounds. 



sufficient supply of suitable food, proper shelter, 

 and protection from enemies. Reasoning from 

 these premises, the conclusion to be drawn is, 

 that the causes prompting the movements of 

 fish in a river, arranged in their order of 

 priority, spring from the instincts of food, 

 shelter, fear of enemies, and reproduction ; as 

 regards the distance traversed by fish, the 

 last factor takes precedence of the others. 



In streams consisting of alternate shallows 

 and deeps, the trout in the early autumn are 

 generally found in the deeps, and remain in 

 that water until the instinct of reproduction 

 impels them to seek their spawning grounds. 

 They will then make their way for great distances 

 up to quick-running shallow water, with bright 

 gravel bottom which is suitable for the 

 deposition of the ova. Water of this character 

 may be found in the main stream, or in tribu- 

 taries or carriers, and trout will spawn in any 

 of them. They appear, however, to give a 

 preference to narrow tributaries, probably 

 because, being fed by springs filtering up 

 through the chalk and gravel, the water in 

 them is free from the sewage and other 

 pollutions present in the main river, and better 

 fitted for hatching-out the ova successfully. 

 The eggs, having been deposited, by the females 

 and fertilised by the males, hatch out in due 



