54 FISH CULTUEE. 



order to freshen tlie water. The lids were of per- 

 forated zinc, as shown in the engraving, in order to 

 keep out vermin, and were padlocked down, so that 

 no one but the proper attendant could get to the ova. 

 These boxes may be made of any length, 4, 6, 8, or 

 10 feet, if required. The one represented was 4 feet 

 long, 15 inches wide, and 10 inches deep, and about 

 six of these boxes were used, fitted on end for end : 

 six such boxes would easUy hatch from 30,000 to 

 40,000 ova or more. 



If there be a good supply of water, and a fair 

 fall, and it be required to hatch a large number 

 of ova, an outlet shoiild be made from the supply 

 stream ; a filtering pond made by means of a bank 

 of fine gravel, through which the water would filter 

 into a small canal or narrow reservoir, whence 

 regular outlets can be made to supply any number 

 of boxes laid down in paraUel rows, with a narrow 

 walk between each row, each separate row being 

 laid down as pointed out above in the single row.^ 

 For this kind of apparatus gravel is preferable, and 

 on this gravel the eggs should be distributed pretty 

 thickly; but not so as to lie upon one another, 

 in order that the attendant may be able to detect 

 and remove dead or putrid ova. Some persons bury 



^ This is the plan adopted at Stormontfield. 



