Fauna of Europe of the Baltic Sea has led to the evolution of many slightly divergent species, such as the Baltic Sea herring, which is a smaller variant of the Atlantic herring. The most frequent benthic species are "Saduria entomon" and "Monoporeia affinis", which is originally a freshwater species. A great part of its bottom is anoxic and without animal life. The Baltic Sea and North Sea are also home to a variety of marine mammals (common seals, grey seals). Europe contains several important freshwater ecoregions, including the heavily developed rivers of Europe, the rivers of Russia, which flow into the Arctic, Baltic,
North Pacific Anadromous Fish Commission the Convention Area. The NPAFC Convention area includes the waters of the North Pacific Ocean and adjacent seas (Bering Sea, Sea of Okhotsk), north of 33°N Latitude in international waters beyond the 200-mile zones of coastal states. Although not part of the Convention area, member nations may conduct scientific activities south of 33°N Latitude beyond the 200-mile zone. Anadromous fish covered under the Convention include Pacific salmon and steelhead trout: Following the conclusion of WWII and the signing of the San Francisco Peace Treaty in 1952, Canada, Japan, and the United States of America entered into a trilateral fisheries convention