160 Fresh Water Aquarium 



so many points that it is often mistaken for 

 the latter. On a base of olive green with 

 a silver luster, appear small irregular cross 

 bars and marble like markings, forming a 

 beautiful ensemble. The ventral and pec- 

 toral fins are placed rather high, and with 

 their bright spots greatly increase the beauty 

 of the fish. 



It is considerably less aggressive than the 

 rock bass, and if one or two years old is 

 a very fine aquarium fish, although to thrive 

 well it needs a dense vegetation. It occurs 

 in the lowland streams and lakes, from New 

 Jersey to Florida. 



The Mud Minnow, Rockfish, or Dogfish 

 (Umbra limi) is a small fish of some merit 

 for the aquarium. Its color is dark olive 

 green, mottled with a lighter shade of the 

 same color and with pale, irregular, narrow 

 bars. The colors vary in shade and inten- 

 sity according to the locality where the fish 

 is found. In the aquarium the Dogfish 

 often stands rigid in an oblique direction, 



