BULLETIN OF THE UNITED STATES FISH COMMISSION. 255 



The Idus has the habits of a river fish, likes deep better than shallow 

 water. It seeks under plants and stones such food as larva', worms, 

 and snails. It takes almost the same food the carp takes, including 

 bread, cooked cornmeal, &c. Vegetable food it will not take. 



The golden ide should not be kept in the same pond with carp. The 

 carp make the water muddy and the ides destroy the ova of the carp. 

 Garp should never be kept in an ide pond if it is desired that such 

 ponds should be clear and that the ides should show to a good advan- 

 tage. 



The golden ide spawns in the neighborhood of Washington in April 

 and the beginning of May, and in cool ponds (spring water) at the end 

 of May. In the Southern States they spawn by the middle of March. 



In regard to hatching in ponds, they would do better in large and 

 deep ponds, with a good crowded vegetation, than in small or shallow 

 ponds. The water in such smaller ponds, during cool nights, often at- 

 tains a low temperature, which would prevent the ova from hatching 

 out advantageously. 



Washington, D. C, June 1, 1885. 



68 FI§HCVLTURE AT GOl rVI¥„E,K, FRANCE. 



By LEOJf D'HALLOY. 



[From a letter to C. Kaveret-Wattel.*] 



Eighteen months ago we placed in the lake at Gouville 1,400 trout a 

 year and a half old. The year before we had placed there 6,000 about six 

 months old. Of theselast not one has been recovered, as they were proba- 

 bly too small to defend themselves in that body of water (about 11 acres). 

 This year we have caught 1,016 three-year-old trout, resembling those 

 we put in. These trout sold in the market' for an average of 2 francs 

 [38 cents] apiece. Our fontinalis have grown less rapidly than either 

 the Scotch or the lake trout ; we are now placing in the lake some two- 

 year-old trout. The Rocky Mountain trout from California is a splended 

 variety. Following your advice, I have imported eggs for two years ; 

 and this year I have again had 20,000 which hatched well, although 

 there was a considerable loss owing to the long voyage. We have now- 

 some good breeders; and during this year we have obtained 40,000 eggs, 

 while next year (1884-'S5) I hope to get 100,001). I think that now 

 the question of industrial fish-culture is settled, or at least, is on the 

 point of being settled. Our expenses are as follows: One man, 1,200 

 francs ; food for the trout, 300 francs ; total, 1,500 francs a year (and 

 we have never spent more). The lake fishing would have returned 

 2,000 francs if we had not reserved some breeders, and the different 



* From Bulletin of French Acclimatization Society, July, 1884, p. 600. 



