Document Detail

Studies on vestibular organs in the fry of mutant Medaka.
MedLine Citation:
PMID:  14676394     Owner:  NASA     Status:  MEDLINE    
We provide an overview of the features of vestibular organs, especially of otolith organs in mutant Medaka ha. The ha fish have a dysfunction in sensing gravity due to the absence of utricular otoliths either unilaterally or bilaterally. Especially in their early developmental stages, the posture control is predominantly depend on light rather than on gravity seen in the wild-type. The ha juveniles that were kept and tolerated in an environment with altered light directions indicated a strong light dependency on the posture maintenance, while the fish under an ordinary light environment gradually changed their posture control by sensing light to gravity around 30 days after hatching and beyond. Their behavior under microgravity agreed with such phenomena observed in ground laboratory.
Rie Mizuno; Kenichi Ijiri
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Uchū Seibutsu Kagaku     Volume:  17     ISSN:  0914-9201     ISO Abbreviation:  Biol. Sci. Space     Publication Date:  2003 Oct 
Date Detail:
Created Date:  2003-12-16     Completed Date:  2008-07-16     Revised Date:  2009-06-04    
Medline Journal Info:
Nlm Unique ID:  100972048     Medline TA:  Biol Sci Space     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  236-7     Citation Subset:  S    
Radioisotope Center, University of Tokyo, Tokyo, Japan.
Space Flight Mission:
Flight Experiment; Parabolic Flight; manned; short duration
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MeSH Terms
Behavior, Animal
Gravity Sensing / physiology*
Oryzias / genetics*,  growth & development*,  physiology
Otolithic Membrane / physiology*
Photic Stimulation
Space Flight*
Vestibule, Labyrinth / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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