64 On Stocking. 



The cultivation of rivers consists in securing a 

 natural flow at all times throughout the river ; 

 but unfortunately this is precisely what cannot 

 be done. If compensation water be honestly 

 passed down, weirs and mill dams pierced with 

 passes, pollution stopped and weed cutting re- 

 gulated, much towards improving the river fishing 

 for Salmonidse will have been accomplished. 

 Many persons think that a portion of a stream 

 has only to be fenced off at either end and it can 

 be readily cultivated and safely stocked ; but the 

 difficulty of making a dam water-tight and a 

 screen trout-proof is great. Any little fall may 

 be utilised to prevent trout ascending, but as yet 

 it passeth the wit of man to prevent their de- 

 scending out of a stream. The difficulty is due to 

 flood, leaves, and frost ; it may be mitigated, but 

 cannot be entirely obviated. The safest plan is 

 to form a long level overflow the height of the 

 outlet screen, so that, when the latter clogs up, the 

 depth of the water on the overflow may be less 

 than one-inch ; trout will not readily pass a knife- 

 edge overflow under these circumstances. 



TRANSPORT OF TEOUT. 



The colder the weather the better for transport- 

 ing yearlings and two-year-olds, the cooler the 

 weather the better for fry ; in other words, in the 



