Challenging zebrafish escape responses by increasing water viscosity

The Journal of Experimental Biology
Nicole Danos, George V Lauder

Abstract

Escape responses of fishes have long been studied as a model locomotor behavior in which hypothesized maximal or near-maximal muscle power output is used to generate rapid body bending. In this paper we present the results of experiments that challenged zebrafish (Danio rerio) to perform escape responses in water of altered viscosity, to better understand the effects that the fluid mechanical environment exerts on kinematics. We quantified escape kinematics using 1000 frames s(-1) high-speed video, and compared escape response kinematics of fish in three media that differed in viscosity: 1 mPa s (normal water), 10 mPa s and 20 mPa s (20 times normal water viscosity). We hypothesized that because viscosity is increased but not density there will be a different effect on kinematic variables resulting from unsteady (acceleration-dependent) hydrodynamic forces and steady (velocity-dependent) ones. Similarly, we hypothesized that the kinematics of stage 1 will be less affected by viscosity than those of stage 2, as higher angular velocities are reached during stage 1 resulting in higher Reynolds numbers. Our results showed a significant overall effect of viscosity on escape response kinematics but the effect was not in accordance wi...Continue Reading

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Citations

May 21, 2014·Proceedings of the National Academy of Sciences of the United States of America·Victor China, Roi Holzman
Mar 25, 2016·Journal of the Royal Society, Interface·Gen LiHao Liu
May 20, 2015·Integrative and Comparative Biology·Timothy E HighamPeter C Wainwright
Jun 20, 2020·Journal of Morphology·Terry R Dial, George V Lauder
Aug 7, 2019·Disease Models & Mechanisms·Alexis A ChagovetzDavid J Grunwald
Feb 5, 2021·The Journal of Experimental Biology·Qiyuan FuChen Li
Jun 30, 2021·The Journal of Physiology·Gal HaspelJennifer R Morgan

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