FOR PLEASURE AND PROFIT. 145 



CHAPTER XIV. 



SOME ADDITIONAL REMARKS CONCERNING REARING 

 FRY AND YEARLINGS. 



In previous chapters I have had occasion again and again 

 to refer to the possibilities? of rearing fry on natural and 

 artificial redds and in specially-made fry ponds; but there 

 is no doubt that where inside rearing 1 boxes are available 

 they are very useful for the purpose of teaching young fish 

 to> feed. I am not forgetting that some fish-culturists trans- 

 fer fry to outside waters ast soon as they commence to feed ; 

 but I am convinced that they can be carried forward a stage 

 further in rearing boxes under complete control with advan- 

 tageous results. And this opinion in no way qualifies the 

 statements I have made concerning the value of properly 

 protected redds and properly formed fry ponds. Inside 

 rearing boxes merely go to form another link in the chain 

 of apparatus by means of which fish-culture may b)s pursued 

 with some certainty of success. One of the principal items 

 in connection with rearing fish is to gradually introduce them 

 to deeper and deeper water of more and more volume until 

 the maximum depth and volume is reached. To transfer a 

 quantity of alevins direct from the boxes in which they have 

 been hatchsd to deep outside ponds or to strong rivers of 

 heavy volume is to cw.rt disaster. This is why I have, right 

 thr<ughout my discourse, insisted upon the necessity of 

 having all fish-farming redds and ponds under control, so 

 that fish may be gradually introduced into the depth and 

 volume of water in which they are intended to provide sport. 

 This is why I have emphasised the usie of sluice boards, by 



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