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National Geographic : 1910 May
Contents
THE NATIONAL GEOGRAPHIC MAGAZINE CATCHING AND SORTING THE BROOD-FISH AT A TROUT-CULTURAL STATION IN THE 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 most 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 OF 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 432
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