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In vivo quantification of mechanical properties of caudal fins in adult zebrafish

  • Puri, Sahil Physik-Institut, University of Zurich, Switzerland - Institute of Molecular Life Sciences, University of Zurich, Switzerland
  • Aegerter-Wilmsen, Tinri Institute of Molecular Life Sciences, University of Zurich, Switzerland
  • Jaźwińska, Anna Department of Biology, University of Fribourg, Switzerland
  • Aegerter, Christof M. Physik-Institut, University of Zurich, Switzerland - Institute of Molecular Life Sciences, University of Zurich, Switzerland
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    15.02.2018
Published in:
  • Journal of Experimental Biology. - 2018, vol. 221, no. 4, p. jeb171777
English Skip to Next SectionThe caudal fins of adult zebrafish are supported by multiple bony rays that are laterally interconnected by soft interray tissue. Little is known about the fin's mechanical properties that influence bending in response to hydrodynamic forces during swimming. Here, we developed an experimental setup to measure the elastic properties of caudal fins in vivo by applying micro-Newton forces to obtain bending stiffness and a tensional modulus. We detected overall bending moments of 1.5×10−9–4×10−9 N m2 along the proximal–distal axis of the appendage showing a non-monotonous pattern that was not due to the geometry of the fin itself. Surgical disruption of the interray tissues along the proximal–distal axis revealed no significant changes to the overall bending stiffness, which we confirmed by determining a tensional modulus of the interray tissue. Thus, the biophysical values suggest that the flexibility of the fin during its hydrodynamic performance predominantly relies on the mechanical properties of the rays.
Faculty
Faculté des sciences et de médecine
Department
Département de Biologie
Language
  • English
Classification
Biological sciences
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/306449
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