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Fish Inner Ear Otolith Growth Under Real Microgravity (Spaceflight) and Clinorotation

Anken, Ralf and Brungs, Sonja and Grimm, Dennis and Knie, Miriam and Hilbig, Reinhard (2015) Fish Inner Ear Otolith Growth Under Real Microgravity (Spaceflight) and Clinorotation. Microgravity Science and Technology, pp. 1-6. Springer. DOI: 10.1007/s12217-015-9459-4 ISSN 0938-0108

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Official URL: http://dx.doi.org/10.1007/s12217-015-9459-4


Using late larval stages of cichlid fish (Oreochromis mossambicus) we have shown earlier that the biomineralization of otoliths is adjusted towards gravity by means of a neurally guided feedback loop. Centrifuge experiments, e.g., revealed that increased gravity slows down otolith growth. Microgravity thus should yield an opposite effect, i.e., larger than normal otoliths. Consequently, late larval cichlids (stage 14, vestibular system operational) were subjected to real microgravity during the 12 days FOTON-M3 spaceflight mission (OMEGAHAB-hardware). Controls were kept at 1g on ground within an identical hardware. Animals of another batch were subsequently clinorotated within a submersed fast-rotating clinostat with one axis of rotation (2d-clinostat), a device regarded to simulate microgravity. Temperature and light conditions were provided in analogy to the spaceflight experiment. Controls were maintained at 1g within the same aquarium. After all experiments, animals had reached late stage 21 (fish can swim freely). Maintenance under real microgravity during spaceflight resulted in significantly larger than normal otoliths (both lapilli and sagittae, involved in sensing gravity and the hearing process, respectively). This result is fully in line with an earlier spaceflight study in the course of which otoliths from late-staged swordtails Xiphophorus helleri were analyzed. Clinorotation resulted in larger than 1g sagittae. However, no effect on lapilli was obtained. Possibly, an effect was present but too light to be measurable. Overall, spaceflight obviously induces an adaptation of otolith growth, whereas clinorotation does not fully mimic conditions of microgravity regarding late larval cichlids.

Item URL in elib:https://elib.dlr.de/102744/
Document Type:Article
Title:Fish Inner Ear Otolith Growth Under Real Microgravity (Spaceflight) and Clinorotation
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Anken, RalfGerman Aerospace Center (DLR), Institute of Aerospace Medicine, Cologne, GermanyUNSPECIFIED
Brungs, SonjaGerman Aerospace Center (DLR), Institute of Aerospace Medicine, Cologne, GermanyUNSPECIFIED
Grimm, DennisUniversity of Hohenheim, Zoological Institute, Stuttgart, GermanyUNSPECIFIED
Knie, Miriammiriknie (at) googlemail.com; University of Hohenheim, Zoological Institute, Stuttgart, GermanyUNSPECIFIED
Hilbig, ReinhardZoological Institute, University of Hohenheim, Stuttgart, GermanyUNSPECIFIED
Date:25 September 2015
Journal or Publication Title:Microgravity Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1007/s12217-015-9459-4
Page Range:pp. 1-6
Keywords:Inner ear, Otolith, Mineralization, Clinostat, Microgravity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Biowissenschaftliche Nutzerunterstützung
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Biomedical Research
Deposited By: Hoven, Claudio
Deposited On:03 Feb 2016 09:46
Last Modified:10 May 2016 23:44

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