Harrison. — Salmon and Trout Eggs- 193 



their eggs. In this province most satisfactory locations are 

 at points where clean loose gravel is to be found, ranging in 

 size from i^" to 2" in diameter. He should then have 

 channels dug in the bed of the stream of sufficient length 

 and width to accommodate the planting box. These chan- 

 nels should be about 5' in length and 2' in width, lying 

 lengthwise up and down stream with a depth in the gravel 

 about the same as that of the box. Care should be taken to 

 ensure that all plantings will be covered with water at all 

 times during incubation, thus a knowledge of what will be 

 the extreme stage of low water should be obtained and al- 

 lowance made accordingly. 



In loading the box it is necessary that the gravel used 

 should be well washed, to clean out all silt and mud. This 

 is usually done by turning it over a few times at the edge of 

 the stream so that it is thoroughly cleansed by the running 

 water flowing through it. It is then placed in a heap in 

 close proximity to the place where the box will be loaded. 

 Where large numbers of eggs are going to be planted the 

 above is the proper method to follow but where small plant- 

 ings are to be made it is advisable to wash and screen the 

 gravel thus eliminating all silt, sand and mud. 



The men in charge should arrange for the loading of the 

 box at a point as near as possible to the area where the eggs 

 are to be planted and a suitable stool should be provided to 

 keep the box clear of the water at a convenient height for 

 filling. 



The method of loading the box is as follows: Place about 

 2" of gravel over the bottom of the box, then carefully scat- 

 ter eggs on the surface of the gravel, taking great care to 

 handle the eggs gently. The eggs will roll into the inter- 

 stices of the gravel. Over this carefully place a covering of 

 gravel, care being taken that the eggs receive no jar or ill 

 usage. Continue to introduce alternately eggs and gravel 

 to within about 4" of the top of the box. The remaining 

 space should be filled with fairly even-sized, clean gravel. 

 The box is then lifted and placed in one of the channels pre- 

 viously prepared in the bed of the stream. Both sides are 

 banked with gravel to the full height of the box. Next 

 insert the long handled hook provided for the purpose, in 

 the iron ring in the center of one of the bottom shutters and 

 draw it clear of the box. Directly the shutter is withdrawn, 

 bank up that end. The same procedure is followed with the 

 other shutter. It is advisable to first withdraw the shutter 

 and bank up the gravel at the upstream end, thus preventing 

 the eggs from being scoured out when the down stream 

 shutter is taken out. The contents will now be lying in the 



