REPORT ON ARTIFICIAL FISH-CULTURE. 61 



which the current passes and leave them in the 

 basin. There they will grow, but their number 

 increasing every day, they cannot be long kept in 

 this narrow reservoir. Larger basins then must 

 be provided, where they can grow with proper 

 nourishment. The depeneencies of the Rhine and 

 Rhone canal will fulfil this office, and on a scale 

 so vast that there will be a crop greater than 

 one would suppose room could there be found 

 for. Thus: the government has on the bor- 

 ders of the canal, on the right and left, land 

 in length 117,730 metres, and breadth 15 metres. 

 Already there they have dug a c'ertain number 

 of ponds, well supplied with water. These ponds 

 may be multiplied indefinitely, and connected by 

 gratings, so as to prevent the admixture of the 

 different kinds of fish, and stopped off occasion- 

 ally in order to admit of being severally emp- 

 tied, so that the young fish can be taken from 

 them. But the ponds already dug on one side 

 of the canal, are in the same part of the meadow 

 with the receiving baisins, into each of which 

 the hatching trenches will carry a particular spe- 

 cies; and it results from this, that to transfer the 

 young of x this species from the establishment 

 where they were hatched to the ponds where they 

 are to be converted into larger growths, there 

 is almost nothing to do. The operation will be 



