248 PROPAGATION OF FISH. 



be taken to remove the sediment, fungus and minute 

 plants as they form, together with all eggs that turn 

 white and die. The boxes should be covered with an 

 open-work cover, either of lattice-work or wire, to keep 

 out leaves. A large species of sieve, of galvanized wire, 

 can be obtained at the stores, and answers well for this 

 purpose, and also to make deors to the breeding-boxes 

 and to be fitted over the outlets or communications be- 

 tween the breeding-ponds, to keep the fish separate. 



The water should be four inches deep in the boxes, 

 and its temperature affects the rapidity of development. 

 A thorough examination should be made every few days, 

 and if the sediment increases beyond control, the eggs 

 may be bodily removed into a clean box. When the 

 young appear they may be left in the boxes or allowed 

 to escape into the pond at large, and will take care of 

 themselves if there be no larger fish around ; in the lat- 

 ter case expect to see them no more. If regularly fed, 

 large numbers can be kept without trouble or danger in 

 narrow accommodations until they attain a respectable 

 size. 



Since writing the above I have had an opportunity of 

 examining Fry's excellent and thorough little work on 

 fish-breeding, which, though principally a translation, 

 exhausts the subject in its present stage, and contains all 

 the requisite instruction. It is recommended to place 

 the fecundated ova on willow hurdles suspended in boxes 

 an inch or thereabout beneath the water, so that they could 

 be conveniently removed and examined. An excellent 

 substitute would probably be, what can be found univer- 

 sally throughout our country, a champagne basket. It 



