70 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Expei'ience at Green Lake has supplied some interesting data. Here 

 we find the breeding-grounds of tlie salmon both in the affluents and in 

 the effluent of the lake, but, unlike Grand Lake, mainly in the affluents. 

 Great Brook, the largest tributary, is most resorted to, and on this 

 stream is located the station of the United States Fish Commission. 

 The most of the breeders are taken in a traj) in the brook, which 

 they readily enter when seeking to ascend to their natural breeding- 

 grounds just above. The trap is constructed of wood and close to it, 

 also in the bed of the brook, are numerous pens of the same material 

 in which the fish are assorted and held during the spawning season. 

 On the bank, snug by the pens, is the spawn-house, and a few rods 

 away is the hatchery. The hatchery is supplied with water from Eocky 

 Pond, the source of Great Brook, by a wooden flume 7,050 feet long, 

 supported by wooden trestles, at some points elevated many feet above 

 the ground. In cold weather the water cools ofl:' 1^ degrees in passing 

 down this flume; in warm weather it warms uid 1^ degrees. Though 

 the summer temperature during the early years of the station was 

 sometimes over 80° F. and some other species succumbed to the heat, 

 the landlocked salmon endured it safely, and the only notable effect on 

 them was that at 75° and upward the adults reared in the station ponds 

 refused to eat. 



As at the Schoodic station, among the adult wild salmon caught 

 for breeding each year are many more females than males. In 1889 

 the proportion was 3 females to 2 males ; in 1893 it was 9 to 4. The 

 size of the Green Lake salmon is remarkable; the mean of 69 full-roed 

 females in 1889 was 7.8 pounds in weight and 25.5 inches in length; the 

 males the same year averaged 5 pounds in weight and 22.3 inches 

 in length; one female weighed 11 pounds 9 ounces, and measured 30 

 inches; another, 11 pounds 6 ounces in weight, was 30^ inches in 

 length; one male, 31 inches long, weighed 13 pounds 8 ounces. The 

 number of eggs yielded by the females is about 4,000 each. 



