STUDIES ON MYTILUS EDULIS L. OF THE "CALANUS" EXPEDITIONS TO HUDSON BAY AND UNGAVA BAY

Abstract

The "Calanus" expeditions of the Fisheries Research Board of Canada give the first detailed data on the distribution of Mytilus edulis L. in Ungava Bay, Hudson Strait, and the northern part of the Hudson Bay. Types of shells of this mollusc and their growth in the above regions are described. The comparison of the growth of M. edulis from Canadian Eastern Arctic, west Greenland, and the northwestern shores of the Atlantic Ocean shows that northward from the Canadian Maritime Provinces the growth of M. edulis slows down. In the region investigated by "Calanus", growth diminishes from Ungava Bay to Hudson Bay. The dependence of the distribution of M. edulis on the types of water masses and its relation to the northern limits of the subarctic zone in the Canadian Eastern Arctic is discussed.