Elevation of Cold Air-Tolerance in Common Carp

Abstract

Lowering the temperature difference to 10°C between acclimatized water and air medium was conducted in order to elevate the cold air-tolerance of the young carp, Cyprinus carpio. For the specimen acclimatized to 17°C water, 100% survival times at 7°C air were examined after precooling with water of gradually decreasing temperature from 17°C to 7°C for setting times ranged from 1 h to 6h. Another treatment as precooling with air as well as starvations of 10 and 20 days under 17°C was investigated to clarify each influence over the cold air-tolerance of carp.
The net elongation time for 100% survival by 2-6 h precooling was 5 h as the maximum. The precooling with air showed a negative effect on the survival time. Starvations for 10 and 20 days both had no effect on the extent of tolerance.