432 



THE NATIONAL GEOGRAPHIC MAGAZINE 



CATCHING AND SORTING THE BROOD-F^ISH AT A TROUT-CUI^TURAL STATION IN THEJ 



ROCKY MOUNTAINS 



ingly of the value of artificial measures 

 than did the preceding increase. 



WORK ON THE GREAT LAKES 



Evidence is not lacking to show that 

 the long-continued and increasingly ex- 

 tensive fish-cultural operations on the 

 Great Lakes have prevented the deple- 

 tion of those waters in the face of the 

 rriost exhausting lake fisheries in the 

 world. 



;The luscious whitefish, the splendid 

 lake trout, the excellent pike perch, or 

 wall-eyed pike, may be hatched in such 

 numbers as to assure their preservation 

 without serious curtailment of the fish- 

 eries. The absence of concerted protec- 

 tive measures, however, on the part of 

 the various states interested has the ten- 

 dency to minimize the effects of cultiva- 

 tion and would seem to justify, if not im- 

 peratively demand, the assumption of 

 jurisdiction by the federal government. 



1,700 BUSHELS OE SALMON EGGS DISTRIB- 

 UTED IN ONE YEAR 



The long continuance of the Penobscot 

 as a salmon stream for many years after 

 all other New England rivers had ceased 

 to carry this fish is directly attributable to 

 the work of the bureau on that stream. 

 So dependent on artificial measures has 

 been the perpetuation of the salmon sup- 

 ply that it is believed the obliteration of 

 the run and the wiping out of a long-es- 

 tablished fishery would ensue within five 

 years after the suspension of fish-cultural 

 operations. Physical conditions in the 

 Penobscot have become so unfavorable 

 for the passage of salmon to the spawn- 

 ing grounds that natural reproduction is 

 now almost if not altogether inhibited, 

 and the only noteworthy source of young 

 salmon is the eggs obtained by the bureau 

 from salmon purchased from the fisher- 

 men. 



The magnitude of the salmon fisheries 

 of the Pacific States has required very 



