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Diet and food selectivity of Calliurichthys japonicus and Repomucenus huguenini were investigat ed from March 1992 to February 1993 in Tosa Bay, Kochi Prefecture. The diet of C. japonicus was com posed of polychaetes, amphipods, gastropods, ophiuroids, bivalves, cumaceans, and other small ben thic animals. Amphipods were abundant in number both in spring and winter months, while poly chaetes and ophiuroids were the most dominant in autumn and summer, respectively. Calliurichthys japonicus actively selected gastropods and showed a more randomized feeding character than R. huguenini. In R. huguenini, polychaetes and amphipods were the most dominant prey items throughout the year. Polychaetes were most abundant in number from spring to autumn, while the amphipods dominated in winter. Although R. huguenini had a similar diet to that of C. japonicus, R. huguenini had a more selective and specialized diet than the C. japonicus, and actively selected decapods, isopods , ostracods, and cumaceans. The difference in feeding habits between the two species may be attributed to their difference in adult body-size and their ability to visually differentiate prey at their different death distributions.

[1] A mesoscale precipitation system generated half a day after a cold front passed over the Kanto Plain in the lee of the Chubu Mountains, Japan. The behavior of precipitable water vapor (PWV) associated with this precipitation system was investigated by the use of a dense Global Positioning System (GPS) network. After the passage of the cold front, a highlevel PWV zone was persistently observed over the Kanto Plain. The mesoscale precipitation system was induced in this zone. A numerical study indicated that the orographic effects on the prevailing wind are very important for sustaining the high-level PWV zone over the Kanto Plain.