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2 
American Fisheries Society. 
As the fry of all the trout species swim in a horizontal posi- 
tion, and seek their food on the surface, in mid-water and at 
the bottom of the trough, the common practice of feeding liver 
emulsion with a feather is more successful than any plan yet 
proposed. On the other hand grayling fry swim in an inclined 
position with the head upward, apparently seeking their food at 
the surface. This is no doubt the case as they do not feed from 
the bottom of the trough, and this would suggest some other 
plan of feeding them. 
It is well-known to close observers that fry in natural waters 
are constantly picking at the leaves and fronds of water plants, 
evidently feeding on small organisms that have found lodgment 
there. In accordance with this fact, and in imitation of one of 
Nature’s provisions, bunches of water cress, which had been pre- 
viously dipped in blood or a mixture of blood and liver emul- 
sion, were suspended in the hatching troughs. The experiment 
was tolerably successful, for it was found that the grayling fry 
at once resorted to the plants and began picking off the food. 
As the troughs were needed for black-spotted trout eggs from 
the auxiliary station the grayling fry were transferred to nur- 
sery ponds, where large bunches of cress and other water plants 
were suspended and on which the food was deposited. The 
ponds were supplied with creek water, in which the fry found 
their natural food, but they continued their attention to the 
cress to some extent. This plan will be continued until they are 
old and large enough to be fed the same as trout fry; the food 
however, will be placed on the plants instead of being thrown on 
the surface. As blood and liver emulsion does not adhere to the 
leaves and stems of the plants as long as desired, it is proposed, 
another season, to mix the food with gelatine of pig’s feet or 
other gelatinous substance to obviate that contingency. 
I contemplated using spleen or milt, as I thought it would 
prove more adhesive than liver, but found it difficult to reduce 
beef milt fine enough in the chopping mill owing to its fibrous 
nature. Another season it 1s proposed to experiment with sheep 
or hog milt, as I am convinced that it will prove a desirable food 
for grayling fry in the earliest swimming stage. 
Before removing grayling fry from the hatchery, the nursery 
ponds are prepared for their reception a month or two in ad- 
