Postural control under clinorotation in upside-down catfish, Synodontis nigriventris.

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  • Ohnishil Ken
    Department of Physiology, Nara Medical University, Kashihara, Nara 634, Japan
  • Takahashi Akihisa
    Department of Biology, Nara Medical University, Kashihara, Nara 634, Japan
  • Koyama Masato
    Senior Research Engineer Frontiers Joint Research Program Department, Japan Space Utilization Promotion Center, Nishiwaseda, Shinjuku-ku, Tokyo 169, Japan
  • Ohnishi Takeo
    Department of Biology, Nara Medical University, Kashihara, Nara 634, Japan

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  • Postural control under clinorotation in

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The upside-down catfish Synodontis nigriventris has a unique habit of swimming and resting upside-down in free water. This behavior leads to the assumption that the catfish has a specific gravity information processing system. We examined the postural control behaviors in the catfish under clinorotation which is usually used for producing pseudo-microgravity. Synodontis nigriventris kept its body posture at a stable area of the rotated flask in which the catfish was kept, when it was clinorotated at the rate of 60 rpm. In contrast to Synodontis nigriventris, a related species, Corydoras paleatus, did not show such steady postural control. When the flask was rotated at a lower rate of 30 rpm or a higher rate of 100 rpm, Synodontis nigriventris as well as Corydoras paleatus showed a considerable disturbed control of body posture. In this condition, they were frequently rotated with the flask. These findings suggest that Synodontis nigriventris has a high ability to keep upside-down posture and the gravity sensation in this catfish is likely to contribute to its different postural control from that of many other fishes.

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