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First published online June 29, 2007
Journal of Experimental Biology 210, 2403-2409 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.000281

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Gill remodeling in fish – a new fashion or an ancient secret?

Göran E. Nilsson

Physiology Programme, Department of Molecular Biosciences, University of Oslo, PO Box 1041, N-0316 Oslo, Norway

View larger version (127K): [in this window] [in a new window]   Fig. 1. (A–D) Scanning electron micrographs of gill filaments from crucian carp kept in normoxic water at 8°C (A,B), in hypoxic water at 8°C (C), or in normoxic water at 25°C (D). Scale bars, 150 µm (A); 50 µm in (B–D) (from Sollid et al., 2003; Sollid et al., 2005a).

View larger version (139K): [in this window] [in a new window]   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).

View larger version (113K): [in this window] [in a new window]   Fig. 3. (A,B) Scanning electron micrographs of gill filaments from goldfish kept in normoxic water at 15°C (A) and 7.5°C (B). Scale bars, 50 µm (from Sollid et al., 2005a).

View larger version (66K): [in this window] [in a new window]   Fig. 4. (A–C) Light micrographs of gills from the mangrove killifish kept in water (A), in air for 1 week (B), and in water for 1 week after air exposure (all at 25°C). Note that the lamellae are present both in water and in air, but that an interlamellar cell mass fills up the space between the lamellae during air exposure. Scale bar, 40 µm (from Ong et al., 2007).