BULLETIN OF THE UNITED STATES FISH COMMISSION. 211 
Roveray, ail these inconveniences disappear ; kept in basins, protected 
| against all danger, the young fish, abundantly fed on live food, develop 
as well if not better than under natural conditions, without involving 
any serious expense for their food ; and when the suitable moment has 
arrived, they can easily be transferred to the waters for which they 
are intended, without running the risk of losing many. 
It is therefore greatly to be desired that the administration should 
abandon the use of very young fish for stocking rivers (as they are 
nearly all doomed soon after they have been placed in the river) and 
give the preference to fish ten or twelve months old, which, as is 
stated above, have yielded the most satisfactory results in England 
and Scotland. 
Messrs. Lugrin and du Roveray, convinced of the advantages of their 
system, propose, at their own expense, to stock a water-course which, 
being subjected to special supervision, will enable them to make an 
absolutely convincing experiment. 
52.— REPORT ON THE PISCIC TO. T UR A L ESTABLISHMENT OF 
PIE ©BA, ARAGON, SPAIN.* 
By F. MlTiVTADAS. 
All persons who devote themselves to practical pisciculture will re- 
member the change of opinion which took place some years ago, owing 
to the weakness of many persons whose experiments proved failures. 
Our Acclimatization Society, however, has never allowed itself to be 
influenced by the “piscicultural malaria;” it has always stood firm and 
preserved its faith in the future; it well understood that the discovery 
of two fishermen of the Yosges Mountains could not become merely a 
subject of curiosity or pleasure. It is true that a large number of 
amateurs have taken a wrong road, but many others have followed the 
right road, and have made marked progress in the successful method 
of raising salmon. 
Prom the moment that the question of raising large quantities of 
young fry and young trout was agitated, it became necessary to pay 
attention to many different circumstances, and not to forget the cost of 
raising fish; for the problem is to derive some profit from the new in- 
dustry, and, according to Mr. LarbaletriePs expression, “to make money 
by pisciculture, and not pisciculture by money.” 
All the methods of artificial feeding are expensive and, what is worse, 
do not entirely answer the purpose; it therefore became necessary to 
find and use natural elements. In short, it became necessary to give 
the young trout what it needed. 
* Rapport stir Vetablissement de pisciculture dc Piedra, Aragon ( Espagne ). From 
Bulletin mensuel de la Societe nationale d’A cclimatation de France , 4tli series, Vol. IV, 
No. 8, August, 1887. Translated from the French by Herman Jacobson. 
