Larval Drift and Juvenile Recruitment of Amphidromous Freshwater Shrimps (Decapoda: Caridea) in the Nishida River, Western Japan

概要

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To clarify the early ecology of amphidromous freshwater shrimps, larval drift in the freshwater area, larval distribution near the mouth of the river, and juvenile recruitment at the uppermost part of the tidal river area were studied in the Nishida River, western Japan. Juvenile recruitment was investigated by using artificial weed as settlement sites. In the river, zoeae of four shrimp species were collected within a short period after sunset, and all zoeae were in the first zoeal stage. About six million zoeae were estimated to pass downstream into the sea in 1998, but few zoeae were captured in the sea near the mouth of the river. Juveniles of three shrimp species, which have not previously been sampled in the river, were collected at the upper end of estuary. These results suggest that amphidromous freshwater shrimps widely disperse through the open sea and some juveniles migrate to other far rivers.
日本水産増殖学会の論文