Abstract
Biomass of meiobenthos were studied during 1918-1983, in the eastern area of Hiuchi-nada and in Suo-nada, Seto Inland Sea. Biomass of meiobenthos were composed mainly nematodes and polychaetes. In the eastern area of Hiuchi-nada, large biomass, mean 610 mg/ m2 in wet weight, were obtained at coastal area less than 20m depth, small biomass, mean 170 mg/m2, were obtained at offshore area more than 20m depth. On the other hand, in Suo-nada, large biomass ranged from 100 to 500 mg wet weight/m2 were recorded at eastern area more than 40m depth, small biomass renged from 0 to 100 mgwet weight/m2 were recorded at western area less than 20m depth. The distributional pattern of the four feeding types of nematodes were connected with sediment condition in both areas, Hiuchi-nada and Suo-nada.
