The Arctic grayling is still abundant in the Yukon and other rivers of Alaska. On the contrary, the Michigan grayling, though plentiful twenty years ago, is now nearly extinct, owing to the extensive lumbering industry. All the graylings spawn in April and May in very shallow water, and the eggs hatch within two weeks. As this is also the time when the saw-logs descend the streams on the spring rise, they plow through the spawning beds, destroying both eggs and newly hatched fry. |In Michigan|The annual recurrence of these circumstances for many years has resulted, unfortunately, in the passing of the Michigan grayling. Overfishing and the incursion of the trout have been mentioned as probable causes, but neither factor could possibly have produced the present state of things. The streams have since been stocked with brook and rainbow trout, and efforts are being made to introduce the Montana grayling.
In Montana
In Montana the grayling is restricted to tributaries of the Missouri River above the Great Falls, except where recently planted. Until within the past few years it inhabited only the three forks of the Missouri—the Gallatin, Madison and Jefferson rivers and tributaries—and Smith River and tributaries below the three forks. It is still abundant in these waters and lives in amity, as it has done for all time, with the red-throat trout and Rocky Mountain whitefish.
From a color sketch by A. H. Baldwin.
Arctic Grayling. (Thymallus signifer.)
Distribution
That the grayling should inhabit only the widely separated regions of Alaska, Michigan and Montana is remarkable. The Arctic grayling is regarded as the parent stock, while the others are possibly relics of the glacial period. This seems probable in connection with the fact that in the mountains where the sources of the Jefferson River arise, there is a deep lake, some four miles long (Elk Lake), that in addition to grayling is inhabited by the Great Lake, or Mackinaw, trout. This trout is found nowhere else west of the Great Lakes except in Canada.
Propagation of the Grayling
Beginning with 1874 numerous attempts were made to propagate the Michigan grayling artificially, but after repeated failures all effort in this direction was abandoned. When a station of the U. S. Fish Commission was established at Bozeman, Montana, in 1897, the Commission, under my supervision, began a series of experiments in grayling culture, resulting in complete success, so that for several years millions of grayling have been hatched and planted, and millions of eggs have been shipped to other stations of the Bureau, where they have been hatched and planted in Eastern waters. It is hoped that they may find a suitable home in some of the streams thus stocked. At the Bozeman station they have been reared to maturity, and eggs taken from these domesticated fish have been hatched. This is considered a triumph in fish-culture. Grayling eggs, by the way, are smaller than trout eggs, while the newly hatched fry are only about one-fourth of an inch long, and are quite weak for several days.