BULLETIN OF THE UNITED STATES FISH COMMISSION. 
72 
weight of aliout 21-1 per cent. During these 90 days thej^ had been given 305 pounds of liver and 
1,627 pounds of mush, costing- .$17.01 ; or each pound of trout gained (after the 20th of February) cost a 
fraction over 5 cents. 
Prior to April 1, 1893, liver cost 3 t} cents a pound ; after that the price was 4-J cents a pound. The 
cost of mush remained unchanged, namely, ^ 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 feet 
by 22 feet, among a lot of 6,000 other yearlings. The element of range so essential to the growth of 
fish was entirely lachiug, as was also that of space and natural pasturage. Pond No. 2, into which 
they were transferred, sup^ilied to a certain extent these requisites. It has a water surface of about 
12,000 square feet and a greatest dejith of 36 inches, whereas the pools had a greatest depth of only 2 
feet, wooden sides and bottom, and with a constant change of 55 gallons of water per minute, the 
maintenance of pasture under these conditions being impossible. Pond No. 2 is, for at least a 
quarter of its area, less than 6 inches in depth, containing considerable aquatic flora and breeding no 
little natural food. 
The Ibllowing table gives the details of the food and cost of 28,000 rainbow trout raised at 
Neosho, Mo., Station, from fry to yearlings, on a mixed diet of beef, liver, and mush, commencing 
when the fry were transferred to the outdoor pools, April 1, 1892, and ending January 31, 1893: 
I'enoil. 
Daily allowance. 
Total for the month. 
Liver. 
Mush. 
Liver. 
Mush. 
30 days of April 
31 days of May 
30 days of June 
31 days of July 
31 days of August 
30 davs of September 
31 days of October 
30 days of November 
31 daVs of December 
31 days of January 
Tounds. 
7 -0 
7- 0 
8- 4 
6-3 
12-0 
12-0 
12-0 
12 -0 
15-0 
15-0 
Poil7l ds. 
8-4 
8-4 
25-2 
35-0 
45-0 
60 -0 
54 -0 
60-0 
60-0 
60 -0 
Pounds. 
210 -0 
217 -0 
252 -0 
195-3 
372 -0 
360-0 
372-0 
300 -0 
465 -0 
465-0 
Pounds. 
2.52 -0 
260 -4 
756-0 
1,085-0 
1,395-0 
1,800 -0 
1, 674 -0 
1,800 -0 
1, 860 -0 
1, 860 -0 
3, 268 -3 
12, 742 -4 
3,268-3 poiinds of liver, at cents a pound, cost$114'39; 12,742-4 pounds of mush, at I cent a pound, cost $31-86; cost 
of food for 28,000 rainbo-w front from April 1 to January 31, $146-25. 
Cost per 1,000, $5-22, or each fish cost .a fraction over J cent. Average cost per day per 1,000 -w.as 1-707 cents. 
Average allo-wance per day (per 1,000) -was 1-87 pounds of the mixture (in the proportion of 1 of liver to 3-79 of mush). 
The fish -were two sizes. On February 11, 1893, they were measured and weighed — 
4,000 averaged 7 inches long and 107-5 pounds per 1,000, or 430 pounds gross. 
24.000 averaged 5h inches long and 42 5 pounds per 1,000, or 1, 020 pounds gross. 
28.000 yearlings weighed 1,452 pounds gross. 
A cost per pound of a fraction over 10 cents. 
/Specimens of trout shipped from Neosho Station to Washinfitoii, D. C., January 26, 1S92, to he cast for 
the World's Fair. 
No. 1. Eainbow trout. Male fish. Hatched from eggs received from tVytheville Station in. January, 1890. Weight, 30 
ounces; age, 2 years. 
No. 2. Same as No. 1. It'eiglit, 21 ounces; age, 2 years. 
No. 3. Brook trout. Hatched from eggs received from Northville Station .Janu.ary 25, 1891. W eight, 6 ounces ; age 12 
months. 
No. 4. Same as No. 3. Weight, C-5 ounces; age, 12 months. 
No. 5. Von Belir (S.fario) trout. Hatched from eggs received from Northville Station February 5, 1891. Weight, 3-5 
ounces; age, 11 mouths. 
No. 6. Same as No. 5. Weight, 3-5 ounces; age, 11 months. 
No. 7. Uainbow trout. Hatched from eggs received from Wytheville Station on .January 17, 1891. Weight, 3 ounces; 
age, 12 months. 
No. 8. Same as No. 7. Weight, 1-5 ounces; age, 12 mouths. 
On February 11, 1893, at Neosho Station, the weighing of yearling rainbow trout showed that— 
Lbs. 
100 of the largest, mush and liver fed, 7 inches long, weighed 10-75 
100 medium size, mush and liver fed, 5-5 inches long, weighed 4-25 
100 smallest size, fed on mush only, 4 inches long, weighed 2-75 
