ffow to obtain it. 201 



witness of a lot of yearling trout thriving in a railway ballast pond 

 with no stream through it. They were put in in 1893, an d in 

 June, 1894, were seen rising freely. Such cases are exceptional, 

 however, but they go to show that where the water is in a healthy 

 state trout may live. Put that water in motion by making a 

 flowing stream of it, and trout would not only live but thrive in it. 

 There may be plenty of oxygen in a hatching box to keep alive a 

 few alevins for some time without a current, but as the number is 

 increased the water supply must also be increased, and where the 

 box has its full complement of fish it must have a full supply of 

 water, or suffocation will soon be the result. 



Livingstone Stone advocates " shallow water with a good 

 ripple." I have found this do very well, and* especially for 

 American trout (Salmo fontinalis), but I like a moderate depth 

 and a good current for trout (Salmo fario) and Loch Levens 

 (Salmo Levenensis). To ensure success with the alevin trout : 



|! Have a good supply of water. 

 I Take care the boxes are kept clean. 



If Allow no hiding-places to exist. 



[I Look carefully to the screens, and beware of crevices. 



Sometimes the alevins may give trouble by getting on to the 

 screens, and getting their sacs through, which means destruction. 

 The loss from this cause was formerly often great, but now it is 

 comparatively trifling. A few will get on to the screens, but they 

 are mostly weak fishes, that are better out of the boxes altogether. 

 The desire to avoid light may be made useful here, and any that 

 get about the screens may be syphoned out, and only the best 

 put back again. Take care to put them in at the head of the box. 

 To drive fish off a screen or from any part of the box where they 

 are not wanted pour water upon them. They do not like this; 

 and will vacate the situation at once. To make them stay. where 

 they ought to be, keep the place as dark as practicable. 



