PATENT ROLLER SPAWNING BOX. 83 



until the water will enter on the level at which, it is to 

 stand over the screens. 



F, (fig. 1), is a screen intended to prevent any fish get- 

 ting to the lower screen, either from within or from with- 

 out, and may extend to the bottom of the box. 



D, is a screen for the same puipose at the front of the 

 box. When the eggs are to be taken, the screen is raised 

 on hinges to an upright position, as seen in fig. 2. This 

 confines the fish which may happen to be in the race, and 

 none of them can get below. The pan is then lowered to 

 its position, the roller turned and the eggs taken. When 

 the operation is finished the screen, D, is again lowered, 

 the button turned, and the work is 'done. If the box is 

 wide — say four feet — it is more convenient to have the pan 

 made in two or three sections, inserted in a light frame, 

 as the eggs can be more easily carried in and poured out 

 of a shorter pan. 



The box can be of any length from four feet to sixty feet, 

 or even longer, and of any width, Irom two feet to six or 

 eight. If it is made very wide, an additional longitudinal 

 support must be provided for the revolving screen. We 

 recommend the following dimensions for Speckled Trout 

 races : Two feet deep, two feet wide, and from ten to 

 twenty feet long, or four feet wide and twenty to forty feet 

 long. The upper screens may be made in convenient sec- 

 tions, the whole width of the box and six or eight feet 

 long. 



A few of the advantages of the plan are as follows : — 

 Compare a double row of two feet square, Ainsworth 

 screens, forty feet long and four feet wide,(such as we have 

 now in use), with one of our spawning boxes of the same 

 dimensions. 



1st. By the old way, it would take two men a good 

 half day to remove the screens singly, feather oflT the eggs 



