FISH HATCHERIES 



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the governments of the world have established hatcheries 

 where fish are raised in great numbers. 



In these hatcheries the eggs are taken from the female 

 and placed in a jar, and the mass of minute sperm cells or 

 "milt" is taken from the male and poured over the eggs, 



Figure 111. — Young Fish Showing Yolk Sac. 



so that practically all the latter hatch. Then by^ giving the 

 developing eggs protection, and the young fish sufficient 

 and proper food, nearly all of these eggs develop into 

 active fish and the great loss that comes to the fish develop- 

 ing in their natural environment is prevented. When 

 they are able to take care of themselves, these fry, as the 

 young hatchery fish are called, are taken to natural feed- 

 ing grounds. In New York state and most other states 



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Figure 112. — Young Fish Fry. 



there are state hatcheries where such fish as shad, pike, 

 lake trout, salmon, brook trout, and others are raised by 

 millions. 



The fish that are most useful as food are taken by hooks, 

 nets, and seines, under certain restrictions. Those like 

 brook trout which are caught as much for sport as for food 

 can be taken only by a hook and line and in certain seasons; 



