926 BULLETIN OF THE BUREAU OF FISHERIES. 



2.5 to 3.5 centimeters. The pressure of the water in the basin varied between 

 130 centimeters at the maximum and 55 centimeters at the minimum. Accord- 

 ing to the opening of the zinc nozzle the upper basin was emptied in fifty to 

 thirty-five minutes. The faUing jet of water was so placed that the water in the 

 hatching box began to rotate. The upper basin was tilled two or three times 

 daily for one hatching box. 



I placed TruUa lacustris in the hatching box, fry obtained from very beautiful, 

 large, eyed eggs, of which I received 5,000 from Schliersee in Upper Austria. The 

 eggs were placed, on January 31, in two California hatching boxes (without the 

 inner set of brass wire trays) between flat roof tiles. The first hatched fishes 

 appeared on March 23 in the receiving boxes placed below. The two boxes in 

 which the eggs had been placed were opened and 8 1 eggs were found thickly 

 covered with ooze and fungus. Since the fry were very unevenly hatched, they 

 were placed immediately in two clean and thoroughly darkened boxes, being 

 transferred first to one and then to a second under the falling water and fed 

 with live food. On April 28, when the fry hatched latest had exchanged their 

 light coloring for a darker, and fed as greedily as the older fishes, they were sent 

 to the Wocheiner Lake, which they reached "in faultless condition," according 

 to the report of the recipient." 



The temperature of the water used in February was 4° to 5°, in March 5° 

 to 8°, but rose later to 10°, then to 13° C. Until April 12 there were no losses; 

 after this there were three in all, one fish being choked b}^ a crumb. No Costia 

 was apparent. On March 30, some seven days later, the second siphon was 

 set flowing for the first lot, consequently 8.4 liters of water were received per 

 minute; the same was done for the second lot. 



As a control lot, on March 28, 30 fish had been placed in a small box (con- 

 taining 1,362 liters of water, flow of 4.2 liters per minute) arranged as heretofore, 

 i.e., on a level with the distributing trough without waterfall or increased pres- 

 sure. On the 3d of April I noticed two weak fishes, one of which was found 

 dead on the 4th, and I found Costia by a microscopic investigation of another fish 

 showing signs of disease. After giving a salt bath to the remaining fishes I left 

 them to their fate in a spring of the pond. 



I saw Costia renewed between afternoon and the next morning in a control 

 lot of jontinalis during the last third of April in spite of salt baths. For security 

 and my own satisfaction I gave a salt bath of 1.5 per cent of 35 minutes' duration 

 to a lot of Trutta lacustris in the morning of April 25 and 27 before shipping 

 them away. 



" The transportation in two casks of 128 to 132 liters lasted iK to 2 hours by wagon, 2 hours and 

 22 minutes by rail plus 47 minutes and 13 minutes standing, a total of 6 hours and 35 minutes. The 

 water was cooled in the hatchery and when placed in the railway carriage was of from 10° to 7.5° C. 

 The day was warm and sunny. The dimensions of all the boxes were 52 by 33 by 22 centimeters. The 

 depth of the water was 15 centimeters. 



