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Fig. 1. (a-f) Scanning electron micrographs from the second gill arch of crucian
carp and goldfish kept at different temperatures. At 15°C (a) and 20°C
(b) the crucian carp gills do not have protruding lamellae. However, after
respirometry at 20°C (c) crucian carp gill filament exhibited protruding
lamellae, a response probably induced by the hypoxic period in the
respirometer. At 25°C (d) the crucian carp developed protruding lamellae
in normoxia. Goldfish gills at 15°C (e) showed protruding lamellae;
however after 5 days at 7.5°C (f) the gill morphology of goldfish started
to resemble that of normoxic crucian carp at 10-20°C. Scale bar, 50
µm.
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