Abstract
Lake Jinzai is a brackish water lake and connects with Japan Sea by Sashimi River. Basic survey on environment and organism in Lake Jinzai was conducted from 1992 to 1993. After 1993, the survey on water quality and Corbicula japonica was carried out by Shimane Prefecture. The survey of sediment and macrobenthos was not conducted in Lake Jinzai since 1993. The purpose of this study was to clarify the current state of water quality, sediment, and macrobenthos in Lake Jinzai and Sashimi River, and field survey was carried out in August 2021. In this study, we collected 17 (Annelida: 7 species, Mollusca: 3 species, Arthropoda: 5 species, Platyhelminthes: 1 species, Nemertea: 1 species) and 8 (Annelida: 2 species, Mollusca: 2 species, Arthropoda: 2 species, Platyhelminthes: 1 species, Nemertea: 1 species) macrobenthic species in Lake Jinzai and the Sashimi River, respectively. Many individuals were collected for C. japonica, Prionospio (Minuspio) japonica, and Procladius sp. in Lake Jinzai, and for C. japonica, Hediste sp. and Prionospio (Minuspio) japonica in the Sashimi River. C. japonica inhabited only the shallow coastal zone and the Sashimi River, suggesting that the distribution of C. japonica was limited.
https://ror.org/01jaaym28 
