960 



BULLETIN OF THE BUREAU OF FISHERIES. 



season. By May 31 a total of 255,600 .brook-trout eggs had been secured. 

 About the first of June 63,000 eyed eggs of this lot were sent to Buenos Aires, 

 and from this city 23,000 were sent to the La Cumbre hatchery, and 40,000 

 to a small temporary hatching plant only recently located near Ledesma, in 

 the Province of Jujuy, the most northerly province of Argentina. A few days 

 later another lot of 25,000 brook trout eggs were shipped from the Nahuel 

 Huapi hatchery to Santiago, Chile, by request of the Chilean Government, 

 to be hatched in a small hatchery belonging to that Government, located in 

 the Andes Mountains, on the railroad which crosses from Buenos Aires to Val- 

 paraiso, not far from the Argentine boundary. The eggs shipped to La Cumbre 

 and Ledesma, via Buenos Aires, reached their respective destinations with a 

 loss of less than 3 per cent. Those shipped to La Cumbre were hatched with 

 a very small loss (less than 4 per cent), and the alevins are strong and robust 

 and fast reaching the feeding stage, with a very small percentage of loss. The 

 loss of eggs hatched at Ledesma was larger, owing to the high temperature of 

 the water we were compelled to use for hatching, which was 55° to 60° F., and 

 8° to 10° F. warmer than at La Cumbre. The loss of alevins at Ledesma has 

 also been rather large to date, owing probably to the same cause; in neither 

 case, however, has the loss been unexpectedly great. 



From what we have accomplished with the brook trout at Nahuel Huapi 

 and La Cumbre, I am led to believe that, by gradually breeding them up to 

 it over a period of two or three years, these fish can be successfully reared in 

 very warm water. 



The following table shows the small loss of stock fish at the Nahuel Huapi 

 hatchery for the five months ended March 31, 1908: 



St.\tement of Losses of Adult Fish at Nahuel HuApi Hatchery for Five Months Ended 



March 31, 1908. 



Species. 



i Deaths from 

 On hand Oct. 30, 1907, 

 Oct. 30. 1907. to Mar. 31, 

 1908. 



On hand 

 Mar. 3 I. 1908. 



Brook trout (2 to 4 years) _ _ 

 Landlocked salmon (4 years) 

 Rainbow trout (3 years) 



Total 



4.902 



70 



4 



4.976 



S3 

 3 



4.849 

 67 



56 



Of fingerling and 3^earling brook trout there were on hand October 30, 

 1907, 60,950; distributed November i, 1907, to March 31, 1908, 49,700; loss 

 November i, 1907, to March 31, 1908, 3,350; on hand March 31, 1908, 8,900.° 



The second shipment of eggs of American fishes to the Argentine Republic 

 resulted rather disastrously. One of the superintendents of this section left New 



<» It is in the summer months — December, January, and February — covered by these figures, 

 that the greatest losses occur. 



