魚類塩濃度適応行動調査のための実験水槽の検討

概要

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We developed novel aquaria to examine the salinity preference of fish. These aquariaare called preference boxes. The aquarium was half-filled with fresh water (FW) first, and then salt water (SW) was infused through a tube set downward along the wall of the aquarium. The horizontal interface of the waters was observed, and the mass of FW was pushed upward as the amount of SW increased, which indicated the significant separation of FW and SW. In the improved model, stairs were made at the bottom of the aquarium so that the aquarium had lower and upper levels. The aquarium was filled with FW, and SW was introduced from the lower level through a tube until the interface reached the upper level. FW and SW were clearly layered, as seen by the difference in relative density, and did not become contaminated for two days. In the aquarium, the fish are able to migrate between FW and SW. Using these devices, it is possible to clarify how the behavior on salinity controls the osmoregulatory ability of fish.
2011-06-30