Stress response of black rock fish according to adapted time in measurement of auditory threshold

In order to obtain the fundamental data for the marine ranch, this paper was carried out to investigate cortisolvariation in blood according to adapted time in the measurement of auditory threshold. The groups wereadapted at the experimental tanks for 0.5, 1, 3 and 6 hours, respectively. At the results, cortisol concentrationhad a deep connection with adapted time. In particular, cortisol concentration in the experimental group of 1hour was significantly increased, whereas others showed no difference comparing with the control group.When classical conditioning method with the sound coupled with a delayed electric shock was given afterthe adapted time of 1 hour and 6 hours, the rate of the conditioning completion for 6 hours was higher thanthat of 1 hour. Therefore, this suggests that the sufficient adapted time was required for the accurate auditorythreshold. Key words : Stress, Auditory threshold, Adapted time