52 REPORT ON ARTIFICIAL FISH-CULTURE. 



value of the mode of multiplication which the 

 authors I have just cited propose to employ. 



Whatever it be, after the entire results of 

 which I render you an account, and after exper- 

 iments analagous to those of Messrs. Gehin and 

 Remy, made by M. Lefebre, of Yaugorard, it 

 seems clear that with perseverance, we can, with 

 little expense, ameliorate the icthyological breed 

 of France, and also for our territory covered with 

 water, a revenue much more considerable than 

 that now derived. 



This would be for the whole country an in- 

 crease of riches, and trials of this kind appear 

 to me all the more important, as several circum- 

 stances tend to diminish the alimentary resource 

 of our rivers. The increasing variety of fish in a 

 good number of our rivers does not arise solely 

 from the manner in which fishing has been pur- 

 sued, but from other causes, among which is the 

 extension of manufacturing industry. Thus, the 

 toll gates established in such numbers for the 

 service of hydraulic motors, are so many obstac- 

 les to the production of various fish, which re- 

 quire to ascend the rivers to their head waters 

 to find fit spawning spots, and single propogators 

 arriving in small numbers in the streamlets, the 

 fish interests of the river sufi'er, for the eggs 

 are not in a condition favorable to the develop- 



