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 S23awned, and the indvidn- 

 als of the same siDecies are so perpetuated in 

 certain rivers without mixino; with those of strangle 

 waters. 



It seems to me consequently induhitahle, that 

 in the sj)ace 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 Remv 

 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 to 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 period ically ; and M. Costa has 



