958 BULLETIN OF THE BUREAU OF FISHERIES. 



to a site about 3 miles away, where were found springs from which would 

 flow at least ten times more water than those at the first location. The hatchery 

 on this site has since been pulled down and rebuilt on a much larger scale. 



We liberated 900,000 strong, healthy whitefish fry in Lago Nahuel Huapi 

 within a month after the arrival of the eggs at the hatchery. Up to the present 

 time, however, no specimens of the whitefish have been secured for unmis- 

 takable identification, owing, probably, to the fact that we have not yet been 

 able to fish systematically for them with suitable boats and nets. A supposed 

 whitefish was caught in a small seine about a year ago by an "estanciero" 

 living on the shore of the lake. 



The majority of the lake trout, as also the greater number of the land- 

 locked salmon, were planted in the lakes Nahuel Huapi, Traful, Gutierrez, and 

 Correntosa. Lago Traful is about 45 miles from Lago Nahuel Huapi, and is about 

 30 miles long, but probably not more than 5 wide at greatest width, and very 

 narrow at other points. Lago Gutierrez and Lago Correntosa are connected 

 with Lago Nahuel Huapi by short streams. Both lakes are about 10 miles 

 long, with an average of 2 to 4 miles in width. The larger proportion of the 

 brook trout were planted in a number of small rivers and streams flowing into 

 these lakes, as well as in tributaries to the Rio Limay and Rio Traful. The 

 Rio Limay flows out of Lago Nahuel Huapi, and the Rio Traful out of Lago 

 Traful, and empties into the Rio Limay. 



Lake trout have been found in Lago Traful and Lago Correntosa, and 

 landlocked salmon in Lago Gutierrez, while brook trout have been found in 

 nearly all of the rivers and brooks stocked. In many of these the brook trout 

 are very numerous and are increasing rapidly. The superintendent and assist- 

 ants of the Nahuel Huapi hatchery took, both last year and this, thousands of 

 fingerlings from irrigating ditches which receive their water from these streams, 

 and replanted them in the brooks. Only last April 860 brook trout fingerlings 

 were taken from a small garden-irrigating ditch heading in the "arroyo de 

 Jones," and 2,300 from another heading in the "arroyo de Newbery." These 

 were undoubtedly fingerlings hatched in September or October, 1907. 



On March i, 1905, the fish in the ponds at the Nahuel Huapi hatchery 

 were counted, and there were found to be 8,500 brook trout, 3,800 lake trout, 

 and 1,800 landlocked salmon. They measured from 6 to 8 inches in length. 

 A large number were accidentally lost during the latter part of the year, but 

 in May, 1906, we had a considerable number of each of these species in the 

 ponds. The death rate in all three from the time hatched, in March, 1904, until 

 now was as low as would have been found at any one of the more successful 

 trout hatcheries in the United States. During this month (May) about 50,000 

 brook trout eggs were collected from stock fish, and the loss on the lot during 

 the hatching period was but 4 per cent. The alevins hatched were strong 



