AMERICAN FISHES IN ARGENTINA. 959 



and healthy, and later turned out a robust lot of fry, the loss being less than 

 5 per cent during the next four months. 



During May and June, 1907, 270,000 brook trout eggs were collected at the 

 Nahuel Huapi hatchery. They were hatched with an average loss of 15 per 

 cent. On June 21 140,000 of these eggs were eyed and started down the Rio 

 Limay to Neuquen in a small boat, and brought from Neuquen to La Cumbre, 

 in the Province of Cordoba, via Buenos Aires, by rail. They arrived at the La 

 Cumbre hatchery July 7, with a loss en route of 2 per cent, and were hatched 

 with a further loss of 4 per cent. The fry loss was not large, not taking into 

 account the killing of a large number by accident. Plants of fry were made 

 during the latter part of August and all of September, in various bodies of 

 water in the provinces of Cordoba, Buenos Aires, Tucuman, Salta, and San 

 Luis. 



La Cumbre is in the Cdrdoba Mountains, an inland range, and about eighteen 

 hours from Buenos Aires by train. The elevation is about 4,100 feet. 



I have not yet had time to make a systematic investigation of the waters 

 stocked with the fish hatched from the 40,000 brook trout eggs at La Cumbre, 

 but have been told that trout do exist in several of these bodies of water; and 

 I know that splendid results have been obtained from a plant of 200, made 

 the last of September, in what is known as the Lumsdaine "dique." This 

 is a small pond from 130 to 150 feet in diameter, nearly round, with a maximum 

 depth of 10 feet in its deepest part when full, which is seldom. The water 

 for filling this pond is brought from a very small mountain stream in an open 

 ditch, which is from one-half to three-fourths of a mile long and into which the 

 Sim shines all day. The minimum flow of this stream is 35 gallons of water 

 per minute, and the ponds receive it all during the first ten days in each month, 

 but only 5 gallons per minute during the rest of the month. The maximum 

 temperature of the water in this stream is 75° to 77° F. at noon on a hot sum- 

 mer's day, but usually drops back to from 60° to 65° F. at night. I do not 

 know the temperature of the water in the ditch where it empties into the 

 pond at midday in summer, but judge it reaches a temperature as high as 80° 

 to 85° F. I presume the temperature of the water in the bottom of the pond 

 is about 74° to 78° F. at this time. 



On July 31 , 1908, about one year after these trout were hatched, there were 

 in this pond from 125 to 150 as fine and healthy brook trout as I have ever 

 seen. The only artificial food they have ever had was during about one month 

 when held in the rearing troughs. Since being liberated they have had only 

 the natural food found in this pond; notwithstanding which all are now from 

 7 to 10 inches in length. 



It is hoped that about one-half million of brook trout eggs and a few thousand 

 of landlocked salmon eggs will be collected at the Nahuel Huapi hatchery this 



