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 whilst at Orton Scar, Cumbria, a silver neck-ring and penannular brooch were uncovered. The historian Peter Hunter Blair believed that the success of the Viking raids and the "complete unpreparedness of Britain to meet such attacks" became major factors in the subsequent Norse invasions and colonisation of large parts of the British Isles. From 865 the Norse attitude towards the British Isles changed, as they began to see it as a place for potential colonisation rather than simply a place to raid. As a result of this, larger armies began arriving on Britain's shores, with the intention of conquering land