Fundamental Study on the Recapturing Method for the Conditioned Fish School

从1986年开始，在一个18×8×1.3m的水箱中，进行了3年的声光复合刺激条件鱼再捕的基础研究。声刺激源为间歇性声音(500赫兹，每隔2秒发出5秒声音)。视觉屏幕是一个直径1米的圆柱形屏幕，由8根钢筋和1米高的中心杆组成，中间有黑白的彩色条纹。屏幕从浮动装置(3*3m)上悬挂，并由电机以4rpm的速度旋转。通过摄食试验，考察了鱼类对听觉和视觉刺激的条件反射过程。在完成鱼的条件反射后，进行了几个实验，详细讨论了条件反射的消退与环境变化和无加强期持续时间的关系。随着饲养试验的加强，条件反射需要在4-5天内完成。在多次重新训练后，鹦鹉对条件反射的保持能力表现出较强的优势。根据对池鱼行为的对比观察，认为漂浮装置和电机噪声影响了条件反射的听觉和视觉刺激的性质。在将鱼运送到不同的鱼缸后，红鱼表现出几乎相似的行为，而鹦鹉则没有表现出这种行为。从这些结果来看，使用复合刺激将更有效地重新获得条件学派。

The fundamental study was conducted on the possibility of recapturing the conditioned fish of parrot bass Oplegnathus fasciatus and red sea bream Pagrus major by the acoustic and visual complex stimuli, in a tank (18*8*1.3m) for three years since 1986. The intermittent sound (500Hz sound of 5 seconds transmitting at 2 seconds interval) was employed as the acoustic stimulus. A visual screen was a cylinder type of 1 meter in diameter, consisted of eight steel bars and an center pole of 1 meter height having the colored stripe of black and white. The screen was suspended from the floating device (3*3m) and rotated by the motor at the speed of 4rpm. The process of the conditioned reflex of fish to the acoustic and visual stimuli were examined with the numbers of feeding trial. After the completion of the conditioned reflex of fish, several experiments were carried out for the detailed discussion on the extinction of the conditioned reflex in relation to the environmental change and the duration of the un-reinforcement period. With the reinforcement by the feeding trials, the conditioned reflex was require in 4-5 days. Parrot bass showed the superior ability in the retention of the conditioned reflex after several breaks of the re-training. According to the comparative observation of the fish behaviour in the tank, the floating device and the motor noise were considered to affect the nature of the acoustic and visual stimuli for the conditioned reflex. After the transportation of fish to the different tanks, red sea bream showed almost the similar behaviour, while parrot bass not showed it. Judging from these results, it will be more effective for recapturing the conditioned school that the complex stimuli are used.