324 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
cent blood and 70 per cent flour, dried and pressed througb an apparatus which 
makes it come out in the shape of worms. Grown trout may also be fed on fresh 
refuse from butcher shops, but there should be an ample supply of fresh water in the 
ponds and suitable aquatic plants, in case the trout are fed on such refuse. Two- 
year-old trout are most in demand in the fish-markets. 
The Starnberg Fish-Cultural Establishment, which belongs to the Bavarian 
Fishery Association, is near the little town of Starnberg and the large lake of the 
same name. This establishment, which is not very favorably located, was considerably 
enlarged and improved two years ago. The supply of water is furnished almost direct 
by the seven springs from which the little stream called Der Sieben Quellen Bach — 
the Seven Springs Brook — takes its origin. As the fall is but short and not very 
abrupt the water is led into the hatching-house through an iron pipe and forced to the 
height needed for the apparatus. On the higher bank of the stream a great many 
ponds have been dug, in which trout of different ages and of different kinds are raised. 
Mr. Le Petit has made several experiments in crossing different kinds of trout. He 
finds that it is of the greatest importance in what order the sex is employed. 
The establishment yields a net revenue of 3,000 marks per annum ($714), and is 
expected to yield a great deal more after everything is put in proper working order. 
1 was informed that some private establishments yield an annual revenue of 15,000 
marks ($3,570). 
The visitors witnessed the so-called “ striking” of trout, i. e., the impregnation of 
trout eggs. In doing this, Mr. Le Petit, who was considered to possess great skill and 
experience in these matters, employed a method halfway between the so-called dry 
and wet methods. First the roe was squeezed into a tin vessel and then the milt from 
the male fish. Then water was poured in the vessel; the milt of one more male fish 
was squeezed into it; the whole was thereupon stirred with the hand, the water was 
poured off, and the roe was slightly rinsed with the remnant of the water. After the 
eggs, impregnated in this manner, had been allowed to stand about five minutes in 
clean water they were placed in the apparatus for further development. The result of 
the impregnation was stated to have been very favorable, as high as 90 per cent. 1 
As the water used in the establishment has a natural temperature of 6° Celsius 
(42.8° F.), the eggs develop very rapidly, so that the eye-spots become visible after 
36 days. The quantity of water used is 2.38 gallons a minute for each apparatus. 
In January I again visited the establishment to take further observations of 
some of its arrangements, and during the same trip I also visited the fish cultural 
establishment near Miihlthal belonging to Prince Ludwig of Bavaria. This was 
founded two years ago, and appears to be arranged in a very simple and practical 
manner. The supply of water is furnished by a large spring. Here I had an 
opportunity to see a very large number of rainbow trout, born April, 1894. These 
trout, which were of considerable size for their age, were crowded together in a dense 
mass below a “feeding- wheel” containing cod roe. In an area of about 400 square 
meters (4,305.6 square feet), 10 small ponds had been dug, in which fat trout of 
different ages were basking in the sunshine. The water is introduced into these 
ponds through iron pipes. 
1 Special stress is laid on the fact that it cost a good deal to gain the experience that only trout 
seven to eight months or, better still, one year old, guarantee the reproduction of trout in waters 
which are to he stocked with these fish. 
