How 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, and 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. 
Take care the boxes are kept clean. 
Allow no hiding-places to exist. 
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. 
