AQUARIUM FISHES 343 



temperatures, may be associated with other small, quiet 

 fishes and thrive on the ordinary foods. 



The species of Rasbora are beautifully colored and other- 

 wise attractive, but have a reputation for delicacy which, 

 unfortunately, seems only too well founded. R. hetero- 

 morpha, the only species familiar to aquarists in this coun- 

 try, is a small, deep-bodied fish, reddish in general color, 

 with a large, triangular, bluish-black spot covering the sides. 

 To its brilliant color it adds active habits, and it is to be 

 hoped that when its needs are better known it will prove 

 longer-lived. At present we can only look to the tempera- 

 ture of its tank, provide it with plentiful crustacean food, 

 as well as the best of artificial mixtures, and hope for the 

 best. 



Danio is a genus which includes several species that meet 

 in every particular the needs of the tyro. Their bold and 

 handsome markings, combined with extreme activity and 

 perfect hardiness, make them ideal aquarium fishes. All 

 bear on the lips two long, hair-like barbules, which are easily 

 observed when the fish is in proper position. 



The feeding habits of the various species are similar. 

 They will take dry food readily, seizing it from the surface 

 of the water in a series of lightning darts. They are ex- 

 ceedingly fond of living food, which should be provided 

 as frequently as possible. 



All are rather difficult to breed, but the feat may be ac- 

 complished if sufificient care is bestowed in the tank. 

 When the eggs are laid, they do not adhere to the plants, 

 but sink to the bottom, where, if undisturbed, they will 

 hatch in a few days. The fishes, however, will persistently 

 search them out and devour them, so they must be removed 

 as soon as oviposition is seen to have occurred. Many 

 breeders cover the bottom of the tank with rough stones, 

 so that the eggs, falling into the interstices, may get beyond 



