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Cluster analysis of data on the species similarity index offish samples taken at various sampling stations of different depths by the R /V “ Dongfang ” of the East China Sea Fisheries Research Institute, Chinese Academy of Fisheries Science, during the deep sea demersal fish resources survey in May - November, 1981, showed deep sea demersal fish fauna of the western part of the East China Sea can be grouped into the following communities :1)The outer continental shelf community ,2)The continental slope community, and3)The western Okinawa Trough community .The authors found that not only the species diversity index, but also the species similarity index are important criteria to reflect the structure of biotic community.
Cluster analysis of data on the species similarity index offish samples taken at various sampling stations of different depths by the R / V “Dongfang” of the East China Sea Fisheries Research Institute, Chinese Academy of Fisheries Science, during the deep sea demersal fish resources survey in May - November, 1981, showed deep sea demersal fish fauna of the western part of the East China Sea can grouped into the following communities: 1) The outer continental shelf community, 2) The continental slope community, and3) The western Okinawa Trough community. The authors found that not only the species diversity index, but also the species similarity index are important criteria to reflect the structure of biotic community.