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
Mining archaeology in the British Isles techniques with visible remains are the opencasts at the surface and group of shafts and caverns underground. The underground complex system was accessible by many different openings which simultaneously used as a ventilation system for the tunnels. The tools in the site constitute mainly by pointed bone tools and stonehammers. Other stone tools revealed at the locations were stone mortars and pestles, which indicate another stage in the ores exploitation. Moreover, a unique find for British Isles were the giant hammers. Evidence for early quarrying was also discovered in Alderley Edge though industrial operations in the 19th century destroyed a