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


Puri, Sahil; Aegerter-Wilmsen, Tinri; Jaźwińska, Anna; Aegerter, Christof M (2018). In vivo quantification of mechanical properties of caudal fins in adult zebrafish. Journal of Experimental Biology, 221:jeb171777.

Abstract

The 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 Nm 2 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.

Abstract

The 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 Nm 2 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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Life Sciences > Ecology, Evolution, Behavior and Systematics
Life Sciences > Physiology
Life Sciences > Aquatic Science
Life Sciences > Animal Science and Zoology
Life Sciences > Molecular Biology
Life Sciences > Insect Science
Language:English
Date:15 February 2018
Deposited On:19 Sep 2018 13:47
Last Modified:29 Jul 2020 07:45
Publisher:Company of Biologists
ISSN:0022-0949
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1242/jeb.171777

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