PROPAGATION AND DISTRIBUTION OF FOOD FISHES, 1926 373 



For some reason the smallmouth bass did not spawn to any appreciable 

 extent, and only about twenty-five 4-inch fingerlings were found in their pond 

 when it was drained. The yield of crappie amounted to 3,825 flngerling fish, 

 Many of this species were lost through the development of algae, which was 

 just beginning to spread at the time the pond was drawn in early October. 



CENTRAL STATION AND AQUARIUM, WASHINGTON, D. C. 



[L. G. IIarrox, Superintendent] 



Earnest efforts were put forth during the year to maintain a creditable 

 display of aquatic life in the aquarium, but it proved almost impossible at 

 times owing to the almost constant use of chlorine in the city water supply. 

 During the period from August 15 to January 1, when the water was almost 

 free of chlorine, no difficulty was experienced in maintaining an attractive 

 exhibit. During the last week of December, however, the reappearance of 

 bacteria in the city supply again necessitated the use of chlorine in large 

 quantities. There were on display at that time about 4.300 chinook-salmon fry 

 and 18,500 rainbow-trout eggs just at the point of hatching. The eggs were at 

 once turned over to the Maryland fish commission, but the fry succumbed to 

 the effects of the chemical before any steps could be taken to dispose of them. 

 Other species of fish eggs, including whitefish, cisco, and pike perch, were 

 received later and successfully incubated. During the year 1,453 fish and 

 aquatic animals, representing 33 species, were carried in the aquarium. 



