Without fatiguing you with all these experiments, 

 I will cite two which were undertaken in a small and 

 a large pond. 



Dr. Leon Lefort, \'ice-President of the Society of 

 Acclimatization of Paris, has raised California salmon 

 and rainbow trout in a pond of a hectare and a half in 

 Sologne. The alevins were furnished by the Troca- 

 dero Aquarium. They w^ere about eight centimeters 

 long when they were placed in this pond of compara- 

 tively high temperature. After two 3'ears' sojourn in 

 the pond the fish reached an average size of twent}^- 

 four inches. 



With the assistance of the Fishery Society of 

 Langres (Haute-Marne) I made a rearing experiment 

 in the pond of Leiz, situated near that town. This is 

 a body of water covering two hundred hectares and has 

 no streams flowing into it. We were therefore assured 

 that no predaceous fish would destroy the alevins 

 which w^e placed there. Under these conditions before 

 the third year the California salmon reached a weight 

 of six to seven kilograms and a length of thirty-one 

 inches, and some of them reproduced. 



It is therefore shown by our experiments that the 

 American Salmonidas live very well in a pond and 

 grow rapidly. Let us incjuire before leaving this sub- 

 ject how it is possible to rear these fishes as regularly 

 as carp are raised. In taking carp culture as a type 

 we do not expect the same results, and it is partly by 

 having misunderstood this principle that the attempts 

 made with trout have been unsuccessful. 



Fish culture should be a methodical process, pro- 

 ducing returns with certainty and regularity. Carp 

 culture has for its object the bringing of this fish to a 

 size advantageous for market purposes, but the carp is 

 not marketable until it reaches a minimum weight of 

 one kilogram, and it finds a better sale when it reaches 

 a weight of two, three, or four kilograms, If we wish 



