REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



45 



Eiver from October 24 to 26, and between January 7 and February 7 

 100,000 fry were deposited in Garden Brook, a tributary of the McOloud 

 Eiver. 



During the year some extensive repairs and improvements were made 

 at the station, including the building of an aqueduct for bringing the 

 water supply to the hatching-house by gravity from a stream near 

 by. This will render unnecessary the use of the wheel as a means of 

 supplying the hatching-house with water during fall and winter, and, in 

 consequence, much labor, expense, and risk of life will be avoided. A 

 rack and footbridge were also constructed across McCloud Eiver and 

 the mess-house repaired. 



The hatching apparatus used at the station is the Williamson trough, 

 fitted with deep trays, which is undoubtedly one of the best appliances 

 for hatching eggs of the Salmonidw on a large scale. The trays used 

 are made of wire netting, 10 inches wide by 24 inches long, and deep 

 enough to bring the tops of the trays an inch or two above the water, 

 which is 5 or 6 inches deep. Into these trays 2 gallons of salmon eggs 

 are poured at a time, making the eggs 12 or 15 tiers deep. They are 

 not injured by being so piled up because the water is continually 

 forcing its way up through and loosening them, thus lightening the 

 weight of those above them and at the same time furnishing them a 

 supply of fresh air. 



The advantages of this method are — 



(1) The top of the tray is above the water and always entirely dry, 

 consequently it is convenient to handle. 



(2) The white eggs can be forced to the top by tilting one end of the 

 tray a little or by lifting it up and setting it gently back in its place. 

 By this means no feather is required to pick over the eggs, and thus, 

 the injuries often inflicted upon them in that way are obviated. 



(3) The top of the tray being above water, the eggs can not escape in 

 any way. 



(4) It economizes space, as 50,000 eggs can be kept on a superficial 

 area of 2 square feet. Two troughs, 20 feet long and 1 foot wide, will, 

 by this method, carry 1,000,000 salmon eggs. 



The maximum and minimum temperatures of air and water at the 

 station during each mouth are shown by the following table: 



Jwiy 



August . . 

 September 

 October . . 

 November 

 December 



January . 

 February 

 Marcli... 



April 



May 



June 



Max. Min. 



87 

 100 

 108 

 115 



Water. 



Max. Min 



49 

 49 

 50 

 52 

 55 

 58, 



