92 
FEEDING AND GROWTH OF RAINBOW TROUT IN THEIR SECOND 
YEAR. 
February 20, 1893, counted 1,500 13-months-old extra 
select rainbow trout into Pond No. 2 to be raised for fu- 
ture brood stock. Total weight, 140.5 lbs., an average of 
93.67 lbs. per 1,000. Average length of trout, 7 in. 
April 26, 1893 (65 days afterward), these trout were re- 
weighed and found to average 260lbs. per 1,000, and to 
measure from 8 to 9in., being an increase in weight of 178 
per cent. During these 65 days they had been given 185 
lbs. of liver and 1,008 lbs. of mush, costing $9.29, or each 
pound of trout gained (after February 20) cost a fraction 
over 32 cents. 
May 20, 1893, 90 days after the fish were first put into 
No. 2 Pond, they were again reweighed and found to 
average 320 lbs. to the 1,000 fish, and to run from 9 to 9% 
in. long, being an increase in weight of about 241 per cent. 
During these 90 days they had been given 305 lbs. of liver 
and 1,627 lbs. of mush, costing $17.01; or each pound of 
trout gained (after February 20) cost a fraction over 5 
cents. 
N. B.—Prior to April 1, 1893, liver cost 3$ cents a 
pound, after that the price was 4$ centsa pound. The 
cost of mush remained unchanged, namely, one-quarter of 
a cent a pound. 
Up to the time these fish were transferred to Pond No. 
2, they had been all the time in a pool 8 x 22 ft., among a 
lot of 6,000 other yearlings. The element of range, so es- 
sential to the growth of fish, was entirely lacking, as was 
also that of space and natural pasturage. Pond No. 2, 
into which they were transferred, supplied to a certain ex- 
tent these requisites. It has a water surface of about 6,000 
square feet and a greatest depth of 36in. Whereas the 
pools had a greatest depth of only 2ft., wooden sides and 
bottom, and with a constant change of 55 gallons of water 
per minute, the maintenance of pasture under these condi- 
