50 REPORT ON ARTIFICIAL FISH-CULTURE. 



to migratory swallows, the salmon after having 

 emigrated far into the sea, returns ordinarily to 

 the water where it was spawned, and the indvidu- 

 als of v the same species are so perpetuated in 

 certain rivers without mixing with those of strange 

 waters. 



It seems to me consequently indubitable, that 

 in the space of a few years it would not only 

 be possible greatly to multiply salmon in all the 

 waters natural to them, but to introduce and 

 acclimate this large and valuable fish in many of 

 our streams hitherto without them. For the sal- 

 mon and the trout also, as well as for many 

 other kinds, the method of Gehin and Eemy 

 appears to be the surest method of stocking 

 rivers ; but we cannot have recourse to the 

 artificial fecundation of eggs to stock fresh wa- 

 ters of certain kinds, of which the introduction, 

 however, would be of great utility in certain locali- 

 ties. Thus, eels are never caught at maturity 

 with milt or eggs, and these fish seem to be only 

 produced in the depths of the sea, whence just 

 spawned they go in legions innumerable every 

 year Jto occupy rivers, where they are known by 

 our fishermen under the name of montee. 



To supply brooks and streams needing them, 

 such spawn must be transported, and the opera- 

 tion renewed ?r; ii: iHv ; an d M. Costa has 



