PEOPAGATION AND DISTRIBUTION OF FOOD FISHES, 1936 365 

 Stations and substations operated and the output of each, fiscal year 1936 — Contd. 



EGG COLLECTIONS 



As might be expected the increase in the collection of eggs was 

 roughly proportional to the augmented output of the species which 

 are incubated artificially. The Bureau's egg supply is obtainable 

 from three sources: Trout eggs are obtained from a brood stock 

 maintained at the hatcheries or by collections from wild fish captured 

 during their spawning migrations. The second source, and the 

 greatest numerically, is the activities of the commercial fishermen, 

 which yields eggs of such varieties as shad, cod, haddock, w^hitefish, 

 pike perch, and lake trout. The eggs of the Pacific salmon are 

 obtained in stiU a different manner, being taken by the Bureau's 

 employees as the fish approach the spawning grounds after having 

 eluded the nets and traps of the commercial fishermen. Many of the 

 eggs, therefore, are in the nature of a byproduct. 



