70 Modern Fishculture in Fresh and Salt Water. 



which the water will fall as it passes through them, and 

 prevent washing out of holes underneath the slats. 

 This apron can be made of boards as an artificial bot- 

 tom to the trap or pens, but a cheaper and quite as ser- 

 viceable method is to place evergreen boughs or green 

 underbrush at the base of the slat-work, covering the 

 same with crushed stone or small stones from the bed 

 of the brook, and then with coarse gravel. This fea- 

 ture of construction is very important. If there is a 

 hole in the trap or pens large enough for trout to 

 escape, they will surely do so. In fact, they will dig 

 out under the slat-work if not properly guarded against. 

 It is well to have planks extending over the trap and 

 pens, on which one can conveniently stand to dip out the 

 fish. Adjacent to the trap and pens, a rough board 

 shanty can be constructed, or a tent can be temporarily 

 used. There will be many stormy and cold days, how- 

 ever, and I advise having a shanty with facilities for 

 heating it, and with a bunk where the attendant can 

 sleep. Add to this equipment a reflecting lantern. 

 Field stations of this description are usually some dis- 

 tance from habitation, and the ordinary comforts of 

 camp life should be available to insure good work of the 

 spawn taker." 



NUMBER OF EGGS IN TROUT. 



Mr. Titcomb gives a very interesting table of the 

 yield of eggs from trout of different sizes, which is 

 worth preserving. He says : 



"Twenty-nine female trout, stripped of spawn at this 

 field station November 26^ 1896, were measured and 

 weighed and the number of eggs yielded by each re- 

 corded. The girth, as given in the following table, 



