University of Tokyo Radioisotope Center, Faculty of Engineering
University of Tokyo Research Center for Nuclear Science and Technology, Faculty of Engineering
Institute of Space and Astronautical Science Space Utilization Research Center
Institute of Space and Astronautical Science Space Utilization Research Center
National Space Development Agency of Japan
出版者
宇宙開発事業団
出版者（英）
National Space Development Agency of Japan (NASDA)
Behaviors and postures of the fish medaka (Oryzias latipes) (adult) and the newt (Cynops pyrrhogaster) (adult female) were observed under microgravity during the parabolic flight. Results and discussions were as follows. Medaka: a pure strain HO5 and the variety of the fish both looped under the dark conditions. However, under the light conditions, HO5 strain showed a looping behavior, but the variety did not. The other pure strain HB32C did not looped either. Thus, there exists a strain-difference in the behavioral response of the fish medaka to microgravity. Newt: newts in water swam with gentle rolling and twisting. In the air, most of them stayed on the surface of the container even under microgravity. Some newts floated during weightless periods. They swam in the air with twisting and kept forelimbs on their sides of the bodies. Newts in the AAEU (Aquatic Animal Experiment Unit) cassette kept a contact on the surfaces of the cassette both in water and in the air since the thickness of AAEU cassette is as narrow as the body width of adult newts. It seems that newts can keep the posture while laying eggs in the AAEU cassette even in space. The mechanical vibration was transmitted to the experimental rack from the aircraft MU-300. In order to evaluate its effects on the behavior, the vibration was recorded for the analysis of amplitude and frequency spectrum.
イモリ・メダカの微小重力下での行動 その1
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