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XXV. On the Means to be employed for multiplying Fi/b. By 

 C. Nouel, Member of the Jury of Lnjlruciion at Rouen*. 



1 ERMIT me to call your attention, and that of your 

 readers, to the advantages which might refult to France by 

 encouraging the multiplication of fifh ; a branch of public 

 ceconomy too much neglected, notwithftanding the experi- 

 ments of our neighbours, and the fuccefs they have obtained. 

 fl is an unexplored mine prefented to national induftry. What 

 produces might we not expert, if our patriotic efforts, directed 

 towards it, mould have for their objeel: an increafe of the na- 

 tural productions of our rivers ; the reflocking our pieces of 

 water, ponds, and lakes, rendered ufelefs by long neglect t 

 Two methods, which might be adopted with equal fa- 

 cility, would conduct to tins refult. The firfl *pnfitts in 

 conveying from the lakes to the rivers, and from the rivers 

 to the lakes, fifh found only in one of them ; the fecond, in 

 introducing into frefli water, as it were infenfibly, and by 

 means of artificial ponds, ii(h produced in fait water, giving 

 the preference to thofe fpecies which by their habits and 

 manner of living might be fitteft for this kind of natural- 

 ization. 



We have already had inftances of fifh being conveyed from 

 one river to another, or from a river to a lake, and vice 

 verfa. This method has been employed with fuccefs in 

 Germany in regard to the fliad, with which ponds and pieces 

 of ftagnant but clear water, with a bottom of land and gravel, 

 preferred by the fhad to all others, have been peopled. Jn 

 the year 1779 Dr. Bloch wrote me from Berlin that this ex- 

 periment had been attended with complete fuccefs. It is not 

 above fifty years ago that Mr* Copland f conveyed perch 

 into the Ken-loch and the river Urr, where they have thriven 

 rcmarkablv well ; as has been the cafe with the trout taken 

 from the river Leven and depofited in Loch Long, in the 

 county of Renfrew. The carp, which is a fifh peculiar to 

 warm climates, has been fucceffively introduced into the 

 rivers and ponds of Pruffia, Denmark, and England. Lin- 

 naeus fays pofitively that this fifh formerly was not known in 

 Sweden ; and in my opinion it is mil unknown in Livonia, 



* Tranllated from the Monitatr of July 17th. Though the objects 

 propofed in this eflay are applied by the author exclufivelv to France, it 

 contains however a great many curious fa£ts applicable to any other coun- 

 try, and therefore we have thought proper to make no alteration in the 

 form in which the author lias given ir.— ■ EniT. 



t Mr. Copland of Collieftyn,— Edit, 



unlefs 



