For these reasons it is suggested that the possible production of commercial fish in Great Slave Lake might run from three to five million pounds annually. The domestic demand for fish in the Great Slave Lake section varies with the hunting conditions. The locality is close to the caribou range in the Precambrian section to the eastward, and a large proportion of the Indians depend substantially on caribou for their own food and that of their dogs. When caribou are abundant, less fish is required, and thus the demand varies from year to year. It is reported that about 1,600 Indians, with 3,000 dogs, subsist on fish for a part of each year. This catch is taken only at certain points in the lake, nearly all close to shore, and includes much fish of no commercial value. The conclusion is that in a lake of this size the commercial fishery would be unlikely to interfere much with the domestic catch. The absence of good harbours as a base for fishing Operations over long stretches of the west shore that front on good fishing grounds, notably the 100 miles of shoreline from Old Fort Island to beyond Jones Point, is a limiting factor in the development of commercial fishing on this shore. Great Bear Lake lies just below the Arctic Circle. It is considerably larger than Great Slave Lake and exceeds both Lakes Erie and Ontario in size. Its waters are cold — ice-covered until late June—and often retain floating ice until August. The waters are crystal clear and organic production presumably is much lower than in comparable lakes to the south. Herring, whitefish, and lake trout are taken, also round whitefish or stickfish, loche, dore, and pike, the latter principally in the inflowing rivers. Fort Franklin, at the outlet of the lake, is the centre of a herring fishery which is carried on for the greater part of the year. The best fishing is in June, falling off in summer and improving from mid-September to freeze-up. Periodic winter runs occur in December, February, and the early spring months. Herring do not appear to be taken in quantity elsewhere. Whitefish, known as “kulva’’, are taken at various points, and at Whitefish River a jumbo size attaining seven pounds is frequently caught. The monster 30-pound whitefish known as “ditchaharday” are regarded as a different species. They are rare. Lake trout are found everywhere. They run up. to 40 pounds and are regarded as game fish by the white residents. Grayling are abundant in all waters tributary to the lake. It is impossible with present knowledge to assess the potential of this huge sub-Arctic lake. On the surface, the presence of such a small Indian population, the con- centration of their fishing operations at only limited points on the lake, variations in the herring run, a history of failure of the runs leading to acute suffering in some years, the low organic productivity of the lake, and the small apparent [ 66 } output, all point to the possibility that these waters may not be able to support any substantial commercial fishery, even if a market could be reached. Moreover, the lake is stormy and rough. Such a conclusion, however, on the thin evidence available, would be dangerous. The fact is that until a great deal more work is done, little more will be known than at present about the economic possibilities of the fish resources of this great inland sea. In 1945, Great Slave Lake came into commercial fish production for the first time. Gill fishermen, with factory workers for the filleting operations, were sent in by an Alberta company. Mechanical freezing equipment was set up, and in the short period available for operation about 1,500,000 pounds of fish, dressed weight, principally lake trout and whitefish, were shipped by refrigerated barge to railhead at Waterways for furtherance to Canadian and United States markets. Operations were continued in 1946, but results are not yet available. Consideration is being given to the possibility of winter operations on the lake. In the same locality, attention is being given to the commercial fishing possibilities of Tathlina and Kakisa Lakes, which lie to the southwest of Great Slave Lake in the vicinity of Hay River Settlement. These lakes would appear in size (500 square miles and upwards) and charac- teristics to be typical of numerous lakes across the area thought to have commercial possibilities. These two are of more immediate interest because of their proximity to the road from Grimshaw to Hay River. Investigation of these lakes is being undertaken by the Dominion Department of Fisheries with the assistance of provincial fisheries authorities. The fisheries of Yukon, like those of north central British Columbia, are of minor commercial significance. A small amount of salmon and whitefish are taken and sold locally, with a few trout and mixed fish. The total reported caught and landed in 1944 was valued at not much over $3,000, though the commercial value of unreported fish taken and consumed locally across this vast area was undoubtedly many times that amount. Regulation and control of fisheries are among the most dificult functions with which an administrative or con trolling body can be faced. When complicated by inter- national considerations, the problems arising in the past have often defied solution and have led to friction, sabotage, and sometimes to the creation of international “incidents”. Although much has yet to be done, the results of the work of the two international commissions in the North Pacific indicate that an important formula for international co- operation in the conservation, development, and regulation of a high-seas fishery has been found, and a milestone passed in the economic history of international relations.