Lake Shinji is an oligo-, mesohaline brackish water lake that, with its connection to Lake Nakaumi, forms the largest brackish water system in Japan. It is also an important fishing ground for an inland fishery that yields the largest catch of the brackish water clam, Corbicula japonica, in Japan. There have been many studies of the ecosystem, organisms, and environment of Lake Shinji, but there are few comprehensive studies covering the entire area the lake. This study conducted a detailed survey of 337 stations evenly distributed across Lake Shinji in August 2018. The survey collected 33 macrobenthos species: 8 molluscs, 6 annelids, 16 arthropods, and 3 other taxa. Corbicula japonica is the dominant species in terms of both population and wet weight, with an overwhelmingly high wet weight proportion of 98%. This once again demonstrates that Corbicula japonica is one of the most important species in the Lake Shinji ecosystem.
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