197 ANIMALS 



FOR PROFIT 



the young from the old. The frog is a cannibal 

 and will eat tadpoles and even the larva. The 

 chief difficulty in raising frogs is to find the 

 proper food for them, unless insects are abund- 

 ant. There are many frog ranches near San 

 Francisco and some do a thriving business, but 

 as a general rule, commercial success has not 

 attended the enterprise in this country. 



Young diamond-backed turtles are cheap, 

 while the full grown are enormously expensive, 

 and the demand for them is constantly increas- 

 ing. It is possible that purchasing young ones 

 and maturing them would open a new line of 

 profit. Common box tortoise and snapping tur- 

 tles are raised for canning, and often take the 

 place of the more expensive diamond-back. 



Although fish culture is little known in this 

 country except under Government auspices, yet 

 carp, black bass, and trout are raised where con- 

 ditions are favorable. It is comparatively easy 

 to cultivate carp, although the industry has never 

 attained such proportions here as in Europe. 

 A pond with a mud or loam soil, and water of the 

 same depth all the year, is all that is needed. 

 In stocking a pond three females are allowed for 



