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,
History of the North Sea claimed no more than narrow coastal waters. In the last few decades things have changed. The countries bordering the North Sea all claim the twelve nautical miles (22 km) of territorial waters within which they have, for example, exclusive fishing rights. Iceland, however, as a result of the Cod Wars has exclusive fishing rights for from its coast, into parts of the North Sea. The Common Fisheries Policy of the EU exists to coordinate fishing rights and assist with disputes between EU states and the EU border state of Norway. After the discovery of mineral resources in the North Sea,