Concerning P^root) Troaf 



And Conditions Favorable to tl)eir Propagation. 



T 



Hl{ artificial propagation 

 of fishes, that is, taking 

 the eggs, impregnating 

 A CRITICAL MOMENT. ^^j hatching them by 



hand, is reduceci practically to an exact science, so far as the eggs of most food 

 fishes are concerned ; and after that the rearing of fry to yearlings or older 

 in the hatcheries is chiefly a matter of cost of food, water supply and care of 

 the young fish by skilled men. Most fish, loo, of all ages are now transported without 

 loss worth mentioning, so the work of actual hatching, rearing, transporting and planting 

 food fishes can be planned in advance and carried out as successfully as the rearing of 

 warm-blooded animals. Beyond the point of planting strong young fish in wild waters, 

 the work may be a success or failure depending upon the conditions existing in the 

 water itself. It may not be an entire success nor an abject failure, but the fish breeder 

 cannot always foresee which it will be with the certainty that he can foretell the results 

 in his hatchery. Wild waters are always presenting problems to be worked out, to 

 insure the success of fish propagation in them, because the conditions are not always 

 constant in any particular water, and conditions change with difTerent waters. In 



