2 9 4 



PRACTICAL ZOOLOGY 



even more valuable. The total quantity taken in 1908 was 

 198,952,814 pounds, valued at $10,683,051. Fifty canneries 

 and forty salting establishments were operated, and 12,183 per- 

 sons were employed to catch, prepare, and transport the canned, 

 pickled, fresh, and frozen fish. 



SOME OF THE FISH AND EGGS DISTRIBUTED BY U. S. BUREAU 

 OF FISHERIES FROM JUNE 30, 1908, TO JUNE 30, 1909 



The Artificial Propagation of Fishes. — In many places the 

 fish have been captured in such great numbers that laws regu- 

 lating the fishing industry have been passed. The federal and 

 state governments have also for many years operated fish hatch- 

 eries, where the eggs of important fishes are kept during their 

 development. In nature very few eggs are allowed to develop 

 because of the attacks of fungi and of animals such as other 

 fishes, crayfishes, and wild fowls. On the other hand, a large 

 percentage of the eggs collected and cared for in fish hatcheries 



1 Fry are fish up to the time the yolk sac is absorbed and feeding begins. 



2 Fingerlings arc fish between the length of one inch and the yearling stage. 



