Crabs of the British Isles (29,193 t), various swimming crabs (3,180 t), the spider crab "Maja squinado" (1,565 t), the shore crab or green crab "Carcinus maenas" (553 t) and the velvet crab "Necora puber" (193 t). Around 77% of the catch is landed in the United Kingdom, 19% in Ireland, 4% in the Channel Islands, and 1% in the Isle of Man. 62 species have been directly observed in the waters of the British Isles: Three deep-water species have also been recorded near the British Isles, and are likely to occur in the area. These are: Crabs of the British Isles Around 65 species
Norse activity in the British Isles to navigating around much of Europe during the Early Mediaeval period. The Norse populations of Scandinavia had developed trade links with many areas of Europe, obtaining large quantities of gold in the late 5th century, most of which had been found in Sweden, and to a lesser extent, Norway. In the final decade of the 8th century AD, Norse raiders attacked a series of Christian monasteries located in the British Isles. In the British Isles, Christian monasteries had often been positioned on small islands and in other remote coastal areas so that the monks could dwell there in seclusion, devoting