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Fig. 24. Sagittal sections of the gills stained with anti-Na+/K+-ATPase in an immature fish caught in the ocean (A), a mature fish caught in Otsuchi Bay (B, day 0), a fish kept in seawater (C, day 5), and a fish kept in freshwater (D, day 5). Well-developed filament MR cells (arrowheads) are present in ocean fish, whereas flat-shape lamellar MR cells (arrows) are present in mature fish caught in the bay. Bar: 50 μm. Reprinted from Mar. Biol., 129, 1997, 247­253, Reduced hypoosmoregulatory ability and alteration of gill chloride cell distribution in mature chum salmon (Oncorhynchus keta) migrating upstream for spawning, Uchida et al., Fig. 4. With kind permission of Springer Science+Business Media.

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