CHAPTER XIX 



THE HATCHING OF TROUT EGGS THE TOAD A FRESH-WATER 

 AQUARIUM THE NESTING OF THE STICKLEBACK 



THE HATCHING OF TROUT EGGS 



THE culture of fish has for some years past attracted considerable 

 notice, and in many places large fish-hatcheries have been built for 

 the rearing of immense numbers of the young of the salmon, trout, 

 and other members of the same family. It is easy therefore to 

 obtain fertile eggs of the trout, and in order to hatch them, little 

 is necessary beyond a supply of clean running water. To rear a 

 large number of fry, a natural or artificial stream is necessary. 



To watch the gradual growth of an active little fish from the egg, 

 will be found highly diverting, and little trouble need be spent in 

 looking after the eggs until the fish are quite formed. 



A convenient form of hatching apparatus is supplied by the 

 Sol way Fishery Company.* 



Otherwise a box or series of boxes (a convenient size being twenty 

 inches long, four and a half inches deep, arid six inches wide) should 

 be arranged one above the other, so that the water can fall by means 

 of lips over the side of one box into the next below it. Fill the 

 boxes with boiled gravel to the depth of about half an inch, and 

 allow water to the depth of two inches to flow over the eggs. A 



* See Appendix. 



