53 
raising of salmonoids was easy. I ransacked my waters 
for these precious crustaceans, and, having found them 
in considerable quantities in the sources and along the 
course of the Devil Rock Brook (Pena del Diablo), I 
went to work and had my first rearing-basin constructed. 
It was a complete success, and I had the honor to report 
it to the Acclimatization Society, which rewarded me by 
one of its medals. My young fish swallowed the little 
shrimps with the greatest delight, and seemed to care 
very little for the coagulated blood which was given to 
them in accordance with the instructions of the majority 
of treatises on pisciculture. 
Ever since my first season I have used nothing but 
small shrimps for feeding my young trout, which grew 
amazingly fast. This method was followed during the 
first eight months, Later they found in the large basins 
(besides myriads of small shrimps) tadpoles, gudgeons, 
and craw-fish, of which they are very fond, especially 
during the shedding period of these crustaceans. In a 
special compartment I tried chopped meat (mutton, rab- 
bit, etc.), but when I found that the carnivorous trout 
did not develop any quicker than the ichthyophagous 
ones, I fed them all on fish and crustaceans. 
The enemies of the young fish (water snakes, water 
ousels, water rats, etc.,) committed great ravages in my 
open-air basins; and with a view to prevent these rava- 
ges, I had a basin constructed of cut stones 10 meters 
(32.8 feet) long, 1 meter (3.28 feet) broad, and 50 cen- 
timeters (1.64 feet) deep. The whole was covered by a 
small house with windows protected by gratings and a 
very close network of wire both down and up the 
stream. 
The experiment had a two-fold interest, viz.: On the one 
hand to keep away the enemies of the young fish, and on 
the other to prove the success of my method of feeding 
the young fish after the umbilical sac had been absorbed. 
This twofold object was attained, and I am able to state 
