..., Loricifera, Tardigrada, Annelida and Arthropoda. Nematoda occupied with more than 90 % of the whole meiobenthos abundance. The vertical distribution of the meiobenthos abundance in sediment was a range of 0.8-93.2 inds./ 10 cm2 in all layers. The highest average value was showed 16.8 inds./ 10 cm2 in 2009...

...). To modify the direct impact of a mining machine on benthos, we made new gear to remove the surface layer of the deep-sea sediment (ie., a scraper). disturbance sediment metazoan meiobentho sparse-point area atmospheric administration nodule modest-point area ind dense-point area tokyo...