On Stocking. 63 



exposed parts of the lake margins, also form part 

 of the cultivation of lakes as trout preserves. 



I may now add a few words on their cultiva- 

 tion as trout farms : here the object is to 

 market the greatest weight of pink-fleshed trout, 

 and size is of slight importance, in fact, in 

 many places half-pound and pound trout com- 

 mand as good a price per pound as larger fish. 



In cultivating for the market, it will, in most 

 instances, pay to net out all trout over two pound 

 weight, to reduce the loss from cannibalism, and 

 as the netting for the market requires to be con- 

 stant, the shotts for the net must be kept clear 

 from water plants, which require to be introduced 

 with more caution than when the lake is used for 

 sport, and only netted in winter and spring to 

 keep down vermin. 



In cultivation for the market, gammarus and 

 Limncea peregra are valuable flesh-colourers, the 

 former especially giving a deep pink to the flesh 

 of the trout. I have found swan mussels l useful 

 in increasing gammarus, but whether from the 

 shelter their dead shells afford, or whether they 

 are eaten by gammarus, who is a great scavenger, 

 I cannot say. 



As yet we are only on border-land of water 

 cultivation ; the subject is well worthy of study 

 and promises to repay manyfold any labour that 

 may be expended upon it. 



1 Anodonta cygnea. 



