SALMON AND TROUT CULTURE. 



447 



Economy in space, where operations are conducted on a 

 large scale, is unquestionably a great advantage : but it is not 

 only in space that the saving is effected : there is a saving also 

 in the cost of building and fitting up the hatching-house, as 

 well as in the quantity of water required — the last an important 

 item of expenditure in many hatcheries. 



• Whatever be the fashion or materials of the hatching 



SKETCH OF WOODEN HATCHING TROUGH. 

 3 feet long by 12 inches wide and 5 inches deep. 



troughs, they should be placed in a good light, and arranged so 

 that they can be easily manipulated for removing the fish and 

 cleansing. Some hatching troughs are placed in out-of-the-way 

 dark corners, where there is no possibility of seeing what is 

 going on, and a great deal of mischief is done before the cause 

 is found out. The cut represents the hatching troughs in my 

 hatchery. 



As before stated, the whole of the inside of the troughs and 

 the perforated trays should be coated with tar varnish or pamt, 



