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SEKIGUCHI, HIDEO, MICHITAKA UCHIDA and AKIHISA SAKAI (Faculty of Bioresources, Mie University). 1995. Post-settlement Processes Determining the Features of Bivalve Assemblages in Tidal Flats. Benthos Research, 49: 1-14. The mouths of two rivers in Japan, the Ano and the Shitomo, are adjacent to each other but show amarked difference in their bivalve assemblages on the tidal flats. From the results of a four-yearfield investigation on the densities of larvae and recruitants of three dominant bivalves (Nuttallia olivacea, Ruditapes philippinarum, Musculista senhousia), we sought to see whether pre-or post-settlement processes are the important factors determining the features of the bivalve assemblages in each river. They were found to be determined basically by post-settlement processes. However, in some years, they were determined after larval recruitment (>1.0mm in shell length), and in other years immediately after the larvae had settled on the tidal flats or after the bivalves had reached a certain size but before larval recruitment.

The present status of trolling of the Biwa salmon Oncorhynchus masou subsp. Lake Biwa,

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To estimate the catch of Honmoroko Gnathopogon caerulescens by recreational anglers around Ibanaiko lagoon, which is adjacent to Laka Biwa, for eŠectiveˆsheries management, we randomly interviewed anglers from