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Fig. 2. (A,B) Light micrographs of gills from crucian carp kept in normoxic (A) or
hypoxic (B) water at 8°C. Note that the lamellae are present in both
conditions but that a regression of the interlamellar cell mass (ILCM) during
hypoxia makes the lamellae protrude, thereby greatly increasing the
respiratory surface area. A filament arteriole (with blood clots) is seen
running vertically in the center of each micrograph. Scale bar, 50 µm (from
Sollid et al., 2003).