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To define the role of the gill under cold air, common carp Cyprinus carpio acclimated to 17°C were exposed to 7°C air after being equipped with a hood, mask, plug, or bag, and their survival percentage was obtained. Secondly, carp acclimated to 7°C were exposed to 7°C air for 6.5-8h, 1) to analyze blood pH and gas, 2) to observe the gill histologically, and 3) to measure the activity of succinate dehydrogenase (SDHase) by methylene blue reduction for tissues including the gill of the specimens.The survival percentage suggested that respiration via the gill occurred to a certain extent in cold air. This was supported by the results of blood gas analysis, histology, and SDHase measurement; in survivors, P02 showed an increasing tendency, and secondary lamellae as well as SDHase activity of the gill were revealed to be in an active condition.

Gill Function of Common Carp in Cold Air Conditions.