The Atlantic Salmon is the most noble representative of the salmonids (Salmonidae). The geographical distribution of the species, within Europe, includes most coastal waters of the White Sea through to the North Sea as well as the Baltic and extends south to northern Portugal. It spends most of its life in the sea, with the exception of spawning when it returns and “runs” in freshwater. During spawning, migratory salmon instinctively come back to the streams where they hatched. Some Atlantic Salmon die after spawning, exhausted by their journey and lack of caloric intake. The Salmon is a true predator. Young fish feed on insects and invertebrates, while adults feed nearly exclusively on fish. Populations of wild salmon in Europe are decreasing rapidly. The biggest threat is the destruction and pollution of habitat and the barricading of natural ascension routes in rivers and streams.