| 摘要 |
PROBLEM TO BE SOLVED: To settle the problems that the turbidity causes decrease of the imaging function of a surveillance camera and occurrence of respiratory distress of fishes and thereby image processing misjudges, miss-analysis is caused by deviation of focal distance of fishes when the water intake amount is not equal to the drainage amount, miss-analysis of image processing is caused by generation of diffused reflection when irradiating light from the upper part of a rearing cistern, also a simple filter is requested, and the like. SOLUTION: The fish observation cistern is formed to be attached with a filter unit and a heater on a pump cistern, a connective drainage unit is furnished from the bottom part of the rearing tank to the side surface of a drainage pump cistern, a clear window transmitting the light of a front fluorescent lamp of the rearing cistern is attached, the filter unit is equipped with a filter medium on the bottom part thereof and a withdrawal lid at the upper part, and a hole for raw water intake is bored on a part of the lid. COPYRIGHT: (C)2009,JPO&INPIT
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