魚類の体液浸透濃度調節と環境塩分適応─ 細胞、個体、行動の連動 ─

概要

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Teleost fish are the first animals that established a homeostasis of the internalenvironment. Gills, kidney, and intestine correspond to the osmoregulatory organs in the fish, and their epithelial cells like the chloride cells contribute largely to the salt-water balance. Euryhaline teleosts such as eel, salmon, and medaka survive both in fresh water (FW) and in seawater (SW), modifying the regulatory mechanisms. The medaka adapt SW via dilute SW. The fish are transferred to the“ preference box”, where the fish migrate from FW compartment to that of SW and vice versa. After a few days in the box, they developed new SW-type chloridecells in the gills, and showed the enhanced SW adaptability during the direct transfer to SW. It seems possible in the animals that a behavior could sustain a physiological ability. Furthermore, animals in the field move to select an optimal conditions; there might be no rapid change in the environment. Our findings need to be revaluated considering if the studies reflect theorganisms in situ.
2009-10-20