Name: a behavioral assay to measure responsiveness of zebrafish to changes in light intensities
Uploaded: 2008-10-03T00:00:00
Description: Watch this Scientific Journal Video about A Behavioral Assay to Measure Responsiveness of Zebrafish to Changes in Light Intensities at JoVE.com

<p class="jove_content">This work was supported by National Institute of Health Grants EY0081 and 5T32UY07145 and by the Knights Templar Eye Foundation.  Jason Rihel is a Bristol-Squibb Fellow of the Life Sciences Research Foundation.</p>

<p class="jove_content">This protocol outlines the steps to perform the Visual-Motor Response of zebrafish larvae to light increments and decrements in your own lab. Zebrafish are a great model system for behavioral studies. They are easy to maintain, they have large clutch sizes, and they develop quickly. For example, the eyes of zebrafish larvae are responsive to light by day 3 of development and at which time they exhibit a startle response. <strong></strong></p>
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<ol>
	<li>Allwardt, A. B., Lall, B. A., Brockerhoff, S. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synapse+formation+is+arrested+in+retinal+photoreceptors+of+the+zebrafish+nrc+mutant.">Synapse formation is arrested in retinal photoreceptors of the zebrafish nrc mutant.</a> <em style='font-style: italic'>J Neurosci</em>. <b>21</b>, 2330-2330 (2001).</li><li>Emran, F., Rihel, J., Adolph, A. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=OFF+ganglion+cells+cannot+drive+the+optokinetic+reflex+in+zebrafish.">OFF ganglion cells cannot drive the optokinetic reflex in zebrafish.</a> <em style='font-style: italic'>Proceedings of the National Academy of Sciences of the United States of America</em>. <b>104</b>, 19126-19126 (2007).</li><li>Prober, D. A., Rihel, J., Onah, A. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypocretin/orexin+overexpression+induces+an+insomnia-like+phenotype+in+zebrafish.">Hypocretin/orexin overexpression induces an insomnia-like phenotype in zebrafish.</a> <em style='font-style: italic'>J Neurosci</em>. <b>26</b>, 13400-13400 (2006).</li><li>Westerfield, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> <em style='font-style: italic'>The zebrafish book: a guide for the laboratory use of zebrafish</em>. , (2000).</li></ol>

<p class="jove_content">The experimental procedures we show in the film are all representative of WT fish. However, these experiments can be done analogously on mutant fish as well (see representative result section). We suggest to plate WT fish and mutant fish on the same plate in a checker board outline for optimal control purposes.</p>
<p class="jove_content">When using mutant fish on the same plate as WT fish make sure that you write down what type of fish was plated in each well. Here is a suggestion on how to keep track of the fish plate...

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<td>Microplate devices</td>
<td>Tool</td>
<td>Whatman</td>
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<td>Transfer pipetes</td>
<td>Tool</td>
<td>VWR</td>
<td>202205</td>
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<td>Fish water</td>
<td>Reagent</td>
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<td>refer to reference #4</td>
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<td>Recording chambers (Zebrabox)</td>
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<td>Viewpoint Lifesciences</td>
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<td>Videotrack Software</td>
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a behavioral assay to measure responsiveness of zebrafish to changes in light intensities 

<p class="jove_content">The optokinetic reflex (OKR) is a basic visual reflex exhibited by most vertebrates and plays an important role in stabilizing the eye relative to the visual scene.  However, the OKR requires that an animal detect moving stripes and it is possible that fish that fail to exhibit an OKR may not be completely blind.  One zebrafish mutant, the no optokinetic response c (nrc) has no OKR under any light conditions tested and was reported to be completely blind.  Previously, we have shown that OFF-ganglion cell activity can be recorded in these mutants.  To determine whether mutant fish with no OKR such as the nrc mutant can detect simple light increments and decrements we developed the visual motor behavioral assay (VMR).  In this assay, single zebrafish larvae are placed in each well of a 96-well plate allowing the simultaneous monitoring of larvae using an automated video-tracking system.  The locomotor responses of each larva to 30 minutes light ON and 30 minutes light OFF were recorded and quantified.  WT fish have a brief spike of motor activity upon lights ON, known as the startle response, followed by return to lower-than baseline activity, called a freeze.  WT fish also sharply increase their locomotor activity immediately following lights OFF and only gradually (over several minutes) return to baseline locomotor activity.  The nrc mutants respond similarly to light OFF as WT fish, but exhibit a slight reduction in their average activity as compared to WT fish.  Motor activity in response to light ON in nrc mutants is delayed and sluggish.  There is a slow rise time of the nrc mutant response to light ON as compared to WT light ON response.  The results indicate that nrc fish are not completely blind.  Because teleosts can detect light through non-retinal tissues, we confirmed that the immediate behavioral responses to light-intensity changes require intact eyes by using the chokh (chk) mutants, which completely lack eyes from the earliest stages of development.  In our VMR assay, the chk mutants exhibit no startle response to either light ON or OFF, showing that the lateral eyes mediate this behavior.  The VMR assay described here complements the well-established OKR assay, which does not test the ability of zebrafish larvae to respond to changes in light intensities.  Additionally, the automation of the VMR assay lends itself to high-throughput screening for defects in light-intensity driven visual responses.</p>

Watch this Scientific Journal Video about A Behavioral Assay to Measure Responsiveness of Zebrafish to Changes in Light Intensities at JoVE.com

A Behavioral Assay to Measure Responsiveness of Zebrafish to Changes in Light Intensities

<p class="jove_content">We developed the Visual-Motor Response to quantitate the motor output of larval zebrafish in response to light increments and decrements.  We also examined zebrafish vision mutants, including the no optokinetic response (nrc) mutants, which were thought to be completely blind when tested by another vision assay, the optokinetic reflex.</p>

A Behavioral Assay to Measure Responsiveness of Zebrafish to Changes in Light Intensities 

The optokinetic reflex (OKR) is a basic visual reflex exhibited by most vertebrates and plays an important role in stabilizing the eye relative to the ...

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