CHARACTERISTICS ON HABITAT OF LARVEA OF DEIRATONOTUS JAPONICUS IN THE KITA RIVER

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  • 北川感潮域に生息するカワスナガニ(Deiratonotus Japonicus)の幼生に関する研究

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In this study, to investigate zoeal characteristics of D.japonicus on special distribution and movement, field observations in the Kita River in Miyazaki, Japan and laboratory experiments were carried out. Then, the movement of zoeae after hatched in the upper end of the tide area was simulated by using a 3-D tidal current and Lagragean model newly developed.<br>Zoeae of D.japonicus prefer high salinity concentration, more than 30, and range almost inside the salt water wedge. Computation results of movement of the zoeae indicated that they are able to easily come back to the parental area by preferring high salinity.

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