LESSON THIRTY. 
FISH FOR THE FARM. 
1. Pond culture-——Three fundamental principles are 
involved in the “commercial production of fish on the 
farm: (1) A never-failing water supply; (2) selection 
of fish adapted to the waters available; and (8) a con- 
tinual natural food supply. Any small body of water 
used for the production of pond fishes should produce nat- 
urally a considerable amount of aquatic food to meet the 
requirements of the fish. One of the provisions of na- 
ture in all primitive bodies of water is the production of 
multitudes of tiny plants and animals that fish feed upon. 
Baby fish depend upon microscopic forms; and larger fish 
upon these and larger aquatic plants and animal life. 
2. Carp.—Some years ago the German carp was intro- 
duced into the United States from Germany, where it 
had long been cultivated in ponds 
for commercial use. This fish is 
adapted for life in farm ponds where 
there is a muddy bottom and an 
abundance of water weeds. It 
never does well in either spring 
ponds or clear streams. The carp lacks the fine flavor 
of the native game fishes, but when kept in ponds free 
from filth and when properly cooked it is highly appre- 
ciated. These fish subsist on mud containing organic 
matter, soft parts of dead plants, aquatic weeds and 
grasses, and all kinds of insect and crustacean life. 
CARP 
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