90 I^. S. BUREAU OF FISHEEIES. 



FRIAE POINT (MISS.) SUBSTATION. 



On September 1 three employees of the Tupelo station with a 

 temporary force of five men undertook the rescue of fish imprisoned 

 in the shallow sloughs along the Mississippi River near Friar Point. 

 Though unfavorable water stages delayed the operations fully 5 

 weeks beyond the usual time, and the work was hampered by inabil- 

 ity to secure satisfactory auto-truck service, the number of fish 

 secured during the season, which ended on November 23, was almost 

 100 per cent greater than in any previous year. The aggregate 

 collections amounted to 1,644,239 miscellaneous fishes, the predomi- 

 nating species being sunfish, catfish, and buffalofish, in the order 

 given. About 8 per cent of the collections were distributed to ap- 

 plicants and the remainder was returned to the main channel of 

 the river. 



CENTRAL STATION AND AQUARIUM, WASHINGTON, 



D. C. 



[L. G. Harrox, Superintendent.] 



Notwithstanding the limitations imposed upon the bureau's aqua- 

 rial work in Washington, mention of which was made in the report 

 of the division of fish culture for 1922, every possible effort was 

 put forth to maintain as adequate a display of live fishes as the 

 conditions would permit. So far as could be arranged for the 

 methods of hatching employed at the different stations were illus- 

 trated, eggs for the purpose being forwarded to central station as 

 they were available. The following eggs were received during the 

 year: 



Chiuook salmon <_ 15, 000 



Humpback salmqn 49, 125 



Rainbow trout 24, 515 



Whitefish 1, 152. 000 



Pike perch 1, 000, 000 



Total L 2, 240, 640 



A large percentage of hatch was obtained on the salmon and 

 trout eggs, and the resulting fry were healthy and vigorous until 

 January 6, when a fresh supply of chlorine was introduced into the 

 city water supply by the health authorities. Two days afterwards 

 it was apparent that practically all fish and eggs on hand were 

 affected, but the mortality among the rainbow-trout irj was so heavy 

 that the lot had to be disposed of and the fry were liberated in the 

 west branch of the Patuxent River. The chinook and humpback 

 salmon seemed to withstand the effects of the chemical much better 

 for a time, but on January 12 they also began dying rapidly and all 

 fry of both species in stock were at once delivered to the Maryland 

 Conservation Commission, at Baltimore, Md. Two thousand eggs 

 of the chinook salmon were held with the view of trying to eliminate 

 the gas from the water supply, but the experiment failed, all fry 

 perishing soon after hatching. 



The whitefish eggs, which were of excellent quality, seemed to 

 withstand the presence of the chlorine for about 10 days. A small 

 mortality then occurred and continued until late in February, when 



