310 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
geton crisjms gives the l)est results.) In tins way the Cyclops 'will live and reproduce with the young 
fish. By digging in a neighboring field one or more holes into which is introduced a small stream of 
water and placing therein the Potumogetons and fountain cress {XasUiriium officinalis'?) (this last 
agrees with the Gammarus) a temperature will he obtained at which the Cyclops can propagate m 
great numbers; and there wdll be at hand in abundance the best food that can be given to the young 
fish. The fish-culturist who possesses clayey land can undertake this without exjiense. In basins so 
prepared it will not be long before confervie and vaucherias will be seen to form, which, after a while, 
becoming decomposed, will take on a brown tint, and in the midst of which the little creatures wull be 
very abundant. 
For collecting the Cyclops a simple net is used, similar to that emjiloyed by entomologists. This 
lets the w'ater pass and retains a multitude of animalcules, not only Cyclops, but the larvie of gnats, 
Uydrachnas, etc., of which the fry are very fond. 
The rearing of Daplinia pnilcx and Cypris fnsca was also tried. The Cypris, however, were found 
to prey upon the young fish. Having been put in Avith the embryos of the carp, they were often 
discovered to the number of two or three fixed upon the back of an alevin devouring it, notwith- 
standing the efforts of the poor animal to shako itself free. It was, therefore, necessary to abandon 
their use, and wuth regret, because their fecundity is certainly much greater than that of the Cyclops, 
and they mature much more quickly. It is believed that this fact is absolutely new in the history of 
applied fish-culture. 
Finally, attention is called to the great number of monstrosities found among eggs taken from the 
trout at Vougeot, at the establishment of M. Peloux. These breeders were reared by M. Peloux and 
came from the same parents, and it is asked whether these deformities may not be attributed to 
consanguinity. 
REPORT BY M. CHABOT-KARLEN ON THE FISH-CULTURAL OPERATIONS OF M. BINDER, 
PROFESSOR AT THE SCHOOL OF AGRICULTURE OF SAINT-REMY (HAUTE-SAONE).* 
In this paper it is stated that during the three years that fish-cultural oiierations were conducted 
at this school 100,000 trout were jilanted in the Lauterne and Moselotte; and that such good results 
were obtained in the Lanterne that the young fish could be seen therein as numerous as minnows; 
that those 11 months old weighed 8 to 16 grams (0.28 ounce to 0.56 ounce) with a length of 7 to 12 
centimeters (2.75 inches to 4.72 inches). 
REPORT BY M. CHABOT-KARLEN ON THE NOTES OF M. DESPRES, PROPRIETOR OF THE 
FISH-CULTURAL ESTABLISHMENT OF NANTEUIL-EN-VALLEE (CHARENTE).I 
This paper has reference to the notes of M. Despres on rearing salinonidie by artificial food. He 
says that the development of the embryo especially attracted his attention; that it was between the 
third and fourth day before the absorption of the sac that the alevdu rvould become hungry and com- 
mence to eat, not seeking its food, but lying in wait for it ; that six or seven days alter it Avould quit 
its hiding-place and attack its prey, snapping at it while in movement in the water. He then enters 
into a description of the means to be employed for the protection and feeding of the young, and he 
seems to have succeeded in his experiments if, as he says, he is able to guarantee the rearing of 90 per 
cent. At Howietouu it is on the weight (one-fiftieth of the liv^ing rveight) that is determined the food 
to be given, a method rvhich appears more scientific and at the same time more practical than that of 
feeding them without regard to age or development. The choice of food largely depends upon environ- 
ment. At Howietoiin molliisks are used to a great extent, while at Nauteiiil brains, blood, and TAmax 
satisfactorily replace these shore animals, of which the alevins are verj^ fond. 
* Published by the National Society of Agriculture of France, .Tune 30, 1886. 
t Presented to the National Society of Agriculture of France, June 30, 1886. 
