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finally, it is a carnivorous fish, a great feeder, and 

 when at liberty in a water-course it has the habit of 

 migrating if a sufficient supply of food is not present 

 and establishing itself elsewhere. In a pond the trout 

 is a prisoner and it must submit to the conditions im- 

 posed upon it, and these do not agree with its inde- 

 pendent spirit. When the small fish available for it 

 are exhausted, and they are rapidly exhausted, the 

 young come to a standstill and the fish are reduced to 

 insect food^ scarcely sustaining themselves, and do not 

 grow any more. 



Add to this the fact that the breeders who have 

 made these attempts and who have favorable conditions 

 for the fish have made a mistake b}^ attempting to cul- 

 tivate the trout by methods which they appl}' to the 

 carp. This is a fundamental error ; a carnivorous ani- 

 mal will never accommodate itself to the mode of life 

 or conditions which are suitable for herbivorous ones. 

 For all these reasons the rearing of the trout in ponds, 

 though often attempted, has not become current among 

 fish culturists. Still I am convinced that under favor- 

 able conditions this rearing will be possible, but it will 

 be necessary to follow a totally different method. 



I have in my experiments here been greatly aided 

 by the importation of Salmonidae, which have fur- 

 nished the means necessary to resolve this problem by 

 having placed in my hands a fish of superior delicacy 

 of flesh and combining all the qualities desirable for 

 pond culture. 



In 1879, the Aquarium of the Trocadero received, 

 through the courtes}^ of the U. S. Fish Commission 

 and at the request of the National Society of Acclima- 

 tization, the eggs of three species of salmon success- 

 fully cultivated in America. 



I devoted myself ardently to the rearing of these 

 fish with the object of introducing and acclimatizing 

 them in the waters of France. I have rested my hopes 



