112 PRACTICAL TROUT CULTURE. 



five inches in length was allowed free quarters 

 among our youngsters ? 



By removing the last year's fishes thus early, we 

 find in April that not only have the plants again 

 grown, covering the bottom with a green carpet, 

 but the microscope reveals every leaf and twig cov- 

 ered with larvae and minute insects. Many of 

 these are they whose attacks were so much feared 

 in the hatching-house ; but the danger from them 

 has passed, and the danger to them, which we care 

 not to prevent, will soon commence. These are 

 the proper food of the troutlet, and the greater their 

 number in the pond, the greater will be our suc- 

 cess. For removing fishes from the nursery, we use 

 a net with a frame of the shape represented in Fig. 

 24 The bottom (A) being equal in width to the 



Fio. 21 



width of our nursery-troughs, and the height twice 

 their depth. With this the entire contents of a 

 compartment may be removed at once, emptied 

 with, care into a basin of water, and transferred to 

 the pond, where they at once dart rapidly tlirough 

 the water, apparently delighted with their new 

 quarters. 



