58 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
514 quarts being obtained on the latter day from the two tugs. All 
the eggs, except 1,500,000 delivered to the Michigan Fish Commission 
from the field, were forwarded to Northville. 
During operations at this point the two tugs captured 9,297 lake 
trout, weighing 69,271 pounds, and by field measurements 1,659.5 quarts 
of eggs were obtained from them. The trout caught by MeCann’s tug 
averaged 8 pounds in weight and those by Martin’s a little less than 
7, making the average for the whole about 7.5 pounds. 
The fishing was under the supervision of the State fish and game 
warden and his deputies, who threatened to arrest the agents of the 
Commission, although operations were conducted in accordance with 
the laws of the State and with an agreement made with the State fish 
and game warden the previous year. Through the courtesy of the 
Attorney-General arrangements were made to have the United States 
district attorney for Michigan defend any employees that might be 
interfered with by the State authorities. 
Of the 13,779,000 lake-trout eggs collected, 7,267,000 were shipped 
to other points, 5,766,000 of them being eyed before shipment, and 
1,501,000 sent out in the green stage. The balance were hatched at 
Northville, producing 3,910,000 fry, which were distributed in suit- 
able waters during the early spring and summer. ‘The majority were 
planted just before the absorpcion of the sae, but 125,000 were held 
until June, measuring about 2 inches in length when distributed. The 
total cost of collecting these eggs was $1,200, or about 9 cents per 
thousand delivered at the hatchery. 
The 9,600 brook-trout fry on hand at the beginning of the fiscal 
year were transferred from the hatchery to the ponds early in July, 
and when counted again on October 12 they numbered 7,569, showing 
a loss of 21 per cent. They did well through the winter, but in April 
they were apparently attacked in the same way as the brook trout of 
previous years, and the mortality increased to such an extent that the 
experiment of thinning them by transferring to other ponds was tried: 
but this seemed to increase rather than diminish the mortality, and 
Mr. Marsh was sent to the station to make a thorough investigation 
of the matter. It is believed that the disease is caused by bacteria, 
and water-tight ponds of stone will probably be constructed for experi- 
mental purposes. 
As there were no brood fish on hand in the fall, 1,000,000 brook- 
trout eggs were purchased from dealers in New England and 32,000 
were received from Kalamazoo, Mich., in exchange for eggs of the 
rainbow trout. The eggs developed well, the hatching being done in 
spring water. The fry began coming out in February and were ready 
for distribution by the middle of Mareh, at which time 991,250 were 
planted in the waters of Michigan, Indiana, and Ohio; 10,000 were 
retained for rearing at the station. 
During January and March three consignments of rainbow-trout 
