334 THE AQUARIUM 



the heavy black line which extends from head to tail on 

 each side. It is found in cold, swift streams, but rapidly 

 adapts itself to life in the aquarium, of which it is a most 

 desirable inhabitant. It is always active and forms an 

 agreeable contrast to the goldfish, with which it may be 

 associated. The ordinary prepared foods, with occasional 

 insects, will suit its needs. 



There are numerous other beautiful species of dace 

 found in America, many of them suitable for life in cap- 

 tivity. A few, however, some of them, unfortunately, 

 among the most lovely, are extremely delicate, and almost 

 impossible to keep without running water. 



Chubs, Horned Dace and small specimens of the many 

 species of Suckers and their allies all live well in the aqua- 

 rium, but are less interesting because of their comparative 

 inactivity. They will do well on the same food as that 

 given the goldfish. 



There are several European species of the carp family 

 which are attractive in the aquarium. The Golden Orfe 

 is an albinistic derivative of the Orfe or Ide (Idus idus), 

 established by careful selection by breeders. It is yellow 

 above, with whitish sides, and of active habit. Small speci- 

 mens make excellent tank fishes, but under favorable con- 

 ditions will grow to a length of more than a foot. 



Although the Tench (Tinea tinea) is a favorite food fish 

 in Europe, the smaller individuals make excellent aquarium 

 pets. The typical form is metallic green, but an albinistic 

 variety, known as the Golden Tench, has been produced in 

 captivity and is an ideal tank fish. It is bright yellow, 

 slightly spotted with darker color, and is active and hardy. 

 All of the above species may be kept with goldfishes, and 

 will thrive on the same food. 



Catfishes and small Eels are interesting captives, but 

 must not be kept with goldfishes or other delicate forms 



