482 U. S. BUREAU OF FISHERIES 



when placed in troughs suppUed with water from the troughs in which brook 

 trout were dying in large luunbers. This would seem to indicate that the dis- 

 ease is not infectious. 



As an experiment, yeast and cod-liver oil were mixed with the ground liver fed 

 to these fish, in the proportion of 2 parts yeast and IJ^ of oil to 963^ parts 

 liver; but it was soon discovered from the quantity of food left on the bottom 

 of the troughs that the fish were rejecting the material, and it was observed 

 that they were preying upon one another. Plain liver was substituted and was 

 taken eagerly, nothing being allowed to accumulate. 



Five hundred thousand pike-perch eggs were transferred during the spring 

 from the Swanton (Vt.) station. They were of fine quality when received and 

 the loss of 100,000 sustained during the incubation period is believed to have 

 been due to the instability of the hatchery water supply. 



During the month of May 45 adult smallmouth bass, furnished from the 

 Cape Vincent (N. Y.) station, were apportioned o.mong the breeding ponds. A 

 few days afterward indications of nest building were noted, and at the close of 

 the fiscal year 4 nests, estimated to contain 5,000 eggs, were observed. 



Craig Bhook (Me.) Station 

 [J. D. De Rocher, Superintendent] 



An account of the year's work in the propagation of Atlantic salmon may be 

 found on page 476 under the heading "Anadromous Fishes of the Atlantic Coast." 

 The landlocked-salmon fry and fingerlings on hand at tlie l^eginning of the 

 fiscal year — approximately 53,000 — were reared to the No. 3 fingerling stage and 

 released in suitable lakes in the region. From 70 adult landlocked salmon cap- 

 tured during November in trap nets set in Toddy Pond, 23,800 eggs were secured 

 and incubated with 142,500 green eggs forwarded from the Green Lake sub- 

 station. In February and March two shipments of eyed eggs of this species, 

 aggregating 501,000, were received from the Grand Lake Stream auxiliary, and 

 a consignment of nearly 200,000 was furnished the station by the State of 

 Maine from its Caribou hatchery. In the course of the season the station shipped 

 160,200 eyed eggs, and 528,200 fry were hatched and liberated in the waters 

 of Maine. 



In January 1,149,000 eyed brook-trout eggs were purchased from commercial 

 dealers in Massachusetts and New York, and a consignment of 53,000 was re- 

 ceived from a Massachusetts dealer in exchange for eggs of the landlocked 

 salmon. A good percentage of hatch was attained with both lots of the purchased 

 eggs but the losses of fry were large, in the case of the Masachusetts consignment 

 amounting to more than one-fifth of the original stock. All tlie young fish 

 resulting from these two shipments were distributed in the advanced fry stage, 

 while those derived from the exchange were on hand at the close of the year. 

 The output of the station also included a few lake-trout fingerlings and fry, the 

 product of eggs forwarded from its Grand Lake Stream auxiliary and the Charle- 

 voix (Mich.) field. 



Grand Lake Stream (Me.) suhstaiion. — At the opening of fiscal j'ear 150,000 

 landlocked-salmon fry were being held in feeding ponds constructed in the canal 

 formerly used for the passage of boats. They were fed from three to five times 

 daily on sheep liver and beef heart, and when released, about the middle of 

 September, they were fine active fish in the No. 3 fingerling stage. 



The canal ponds are proving far superior to the trough-feeding system for 

 the rearing of landlocked salmon. They not only require much less work but 

 the losses are lighter, the fish are in better health, and attain a larger growth. 

 Eggs of the landlocked saLnon to the number of 1,096,700 were secured in Novem- 

 ber from 782 brood fish, wliich were captured by means of three crib nets and a 

 trap installed in Grand Lake. The collection of eggs was larger than last year, 

 when operations were conducted at both Grand and Dobsis Lakes, by approx- 

 imately 112,000. On attaining the eyed stage 501,000 of the eggs were trans- 

 ferred to the main station. Plants of fry aggregating 273,250, part of the 

 product of the remaining eggs, were made early in June in suitable local lakes, 

 and the canal system was again stocked with 150,000 with the object of distribut- 

 ing them as fingerlings in the fall. 



Owing to unfavorable weather and the difficulty of setting nets, the work of 

 obtaining lake-trout eggs during October in the open waters of Grand Lake 

 did not meet with much success, only 17,000 being secured. These were the 

 yield of the four female fish captured, one of which weighed 30 pounds. The 

 eggs were carried to the eyed stage with a loss of about 11 per cent. 



