Name: electrophysiological recording in the brain of intact adult zebrafish
Uploaded: 2013-11-19T17:00:00
Description: Watch this Scientific Journal Video about Electrophysiological Recording in the Brain of Intact Adult Zebrafish at JoVE.com

This work was supported by NIH/NINDS Grant R01NS070159 (to T.M.D, J.D.L and A.T.S).

All experimental procedures were conducted in strict accordance with the National Institutes of Health Guide for the Care and Use of Laboratory Animals and followed protocol #A2011 09-003, which was reviewed, approved, and overseen by the University of Georgia Institutional Animal Care and Use Committee.
1. Equipment Setup
<ol>
	<li>Perfusion system for craniotomy 
	Immobilization of the adult necessitates an intubation system to deliver dissolved oxygen to the fish.&#1...

<ol>
	<li>Henze, D. A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intracellular+features+predicted+by+extracellular+recordings+in+the+hippocampus+in+vivo.">Intracellular features predicted by extracellular recordings in the hippocampus in vivo.</a> J. Neurophysiol. 84, 390-400 (2000).</li><li>Gabriel, J. P., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Locomotor+pattern+in+the+adult+zebrafish+spinal+cord+in+vitro.">Locomotor pattern in the adult zebrafish spinal cord in vitro.</a> J.Neurophysiol. 99, 37-48 (2008).</li><li>Vargas, R., Johannesdottir, I. T., Sigurgeirsson, B., Thornorsteinsson, H., Karlsson, K. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+zebrafish+brain+in+research+and+teaching:+a+simple+in+vivo+and+in+vitro+model+for+the+study+of+spontaneous+neural+activity.">The zebrafish brain in research and teaching: a simple in vivo and in vitro model for the study of spontaneous neural activity.</a> Adv Physiol Educ. 35, 188-196 (2011).</li><li>Makhankov, Y. V., Rinner, O., Neuhauss, S. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+inexpensive+device+for+non-invasive+electroretinography+in+small+aquatic+vertebrates.">An inexpensive device for non-invasive electroretinography in small aquatic vertebrates.</a> J. Neurosci. Methods. 135, 205-210 (2004).</li><li>Brockerhoff, S. E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+behavioral+screen+for+isolating+zebrafish+mutants+with+visual+system+defects.">A behavioral screen for isolating zebrafish mutants with visual system defects.</a> Proc. Natl. Acad. Sci. U.S.A.. 92, 10545-10549 (1995).</li><li>Baraban, S. C., Taylor, M. R., Castro, P. A., Baier, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pentylenetetrazole+induced+changes+in+zebrafish+behavior,+neural+activity+and+c-fos+expression.">Pentylenetetrazole induced changes in zebrafish behavior, neural activity and c-fos expression.</a> Neuroscience. 131, 759-768 (2005).</li><li>Baraban, S. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+large-scale+mutagenesis+screen+to+identify+seizure-resistant+zebrafish.">A large-scale mutagenesis screen to identify seizure-resistant zebrafish.</a> Epilepsia. 48, 1151-1157 (2007).</li><li>Maximino, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Serotonin and anxiety: Neuroanatomical, pharmacological and functional aspects. , (2012).</li><li>Bally-Cuif, L., Vernier, P., Perry, S. F., Ekker, M., Farrell, A. P., Brauner, C. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Fish Physiology: Zebrafish. 29, (2010).</li><li>Kaslin, J., Nystedt, J. M., Ostergard, M., Peitsaro, N., Panula, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+orexin/hypocretin+system+in+zebrafish+is+connected+to+the+aminergic+and+cholinergic+systems.">The orexin/hypocretin system in zebrafish is connected to the aminergic and cholinergic systems.</a> J. Neurosci. 24, 2678-2689 (2004).</li><li>McLean, D. L., Fetcho, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ontogeny+and+innervation+patterns+of+dopaminergic,+noradrenergic,+and+serotonergic+neurons+in+larval+zebrafish.">Ontogeny and innervation patterns of dopaminergic, noradrenergic, and serotonergic neurons in larval zebrafish.</a> J. Comp. Neurol. 480, 38-56 (2004).</li><li>Mueller, T., Vernier, P., Wullimann, M. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+adult+central+nervous+cholinergic+system+of+a+neurogenetic+model+animal,+the+zebrafish+Danio+rerio.">The adult central nervous cholinergic system of a neurogenetic model animal, the zebrafish Danio rerio.</a> Brain Res. 1011, 156-169 (2004).</li><li>Higashijima, S., Schaefer, M., Fetcho, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Neurotransmitter+properties+of+spinal+interneurons+in+embryonic+and+larval+zebrafish.">Neurotransmitter properties of spinal interneurons in embryonic and larval zebrafish.</a> J. Comp. Neurol. 480, 19-37 (1002).</li><li>Tao, L., Lauderdale, J. D., Sornborger, A. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mapping+Functional+Connectivity+between+Neuronal+Ensembles+with+Larval+Zebrafish+Transgenic+for+a+Ratiometric+Calcium+Indicator.">Mapping Functional Connectivity between Neuronal Ensembles with Larval Zebrafish Transgenic for a Ratiometric Calcium Indicator.</a> Front Neural Circuits. 5, 2 (2011).</li><li>Fan, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=New+statistical+methods+enhance+imaging+of+cameleon+fluorescence+resonance+energy+transfer+in+cultured+zebrafish+spinal+neurons.">New statistical methods enhance imaging of cameleon fluorescence resonance energy transfer in cultured zebrafish spinal neurons.</a> J Biomed Opt. 12, 034017 (2007).</li><li>Burgess, H. A., Granato, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sensorimotor+gating+in+larval+zebrafish.">Sensorimotor gating in larval zebrafish.</a> J. Neurosci. 27, 4984-4994 (2007).</li><li>Burgess, H. A., Schoch, H., Granato, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Distinct+retinal+pathways+drive+spatial+orientation+behaviors+in+zebrafish+navigation.">Distinct retinal pathways drive spatial orientation behaviors in zebrafish navigation.</a> Curr. Biol. 20, 381-386 (2010).</li><li>Mueller, K. P., Neuhauss, S. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Behavioral+neurobiology:+how+larval+fish+orient+towards+the+light.">Behavioral neurobiology: how larval fish orient towards the light.</a> Curr. Biol. 20, 159-161 (2010).</li><li>Haug, M. F., Biehlmaier, O., Mueller, K. P., Neuhauss, S. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Visual+acuity+in+larval+zebrafish:+behavior+and+histology.">Visual acuity in larval zebrafish: behavior and histology.</a> Front. Zool. 7, 8 (2010).</li><li>Fetcho, J. R., Higashijima, S., McLean, D. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Zebrafish+and+motor+control+over+the+last+decade.">Zebrafish and motor control over the last decade.</a> Brain Res.Rev. 57, 86-93 (2008).</li><li>Connaughton, V. P., Nelson, R., Bender, A. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Electrophysiological+evidence+of+GABAA+and+GABAC+receptors+on+zebrafish+retinal+bipolar+cells.">Electrophysiological evidence of GABAA and GABAC receptors on zebrafish retinal bipolar cells.</a> Vis. Neurosci. 25, 139-153 (2008).</li><li>Kim, Y. J., Nam, R. H., Yoo, Y. M., Lee, C. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+and+functional+evidence+of+GABAergic+neurons+in+parts+of+the+brain+of+adult+zebrafish+(Danio+rerio).">Identification and functional evidence of GABAergic neurons in parts of the brain of adult zebrafish (Danio rerio).</a> Neurosci. Lett. 355, 29-32 (2004).</li><li>Sato, Y., Miyasaka, N., Yoshihara, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hierarchical+regulation+of+odorant+receptor+gene+choice+and+subsequent+axonal+projection+of+olfactory+sensory+neurons+in+zebrafish.">Hierarchical regulation of odorant receptor gene choice and subsequent axonal projection of olfactory sensory neurons in zebrafish.</a> J. Neurosci. 27, 1606-1615 (2007).</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> The zebrafish book: a guide for the laboratory use of zebrafish (Brachydanio rerio). , (1993).</li><li>Lazarova, M., Samanin, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Potentiation+by+yohimbine+of+pentylenetetrazol-induced+seizures+in+rats:+role+of+alpha+2+adrenergic+receptors.">Potentiation by yohimbine of pentylenetetrazol-induced seizures in rats: role of alpha 2 adrenergic receptors.</a> Pharmacol. Res. Commun. 15, 419-425 (1983).</li><li>Loscher, W., Honack, D., Fassbender, C. P., Nolting, B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+role+of+technical,+biological+and+pharmacological+factors+in+the+laboratory+evaluation+of+anticonvulsant+drugs.+III.+Pentylenetetrazole+seizure+models.">The role of technical, biological and pharmacological factors in the laboratory evaluation of anticonvulsant drugs. III. Pentylenetetrazole seizure models.</a> Epilepsy res. 8, 171-189 (1991).</li><li>DeMicco, A., Cooper, K. R., Richardson, J. R., White, L. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Developmental+neurotoxicity+of+pyrethroid+insecticides+in+zebrafish+embryos.">Developmental neurotoxicity of pyrethroid insecticides in zebrafish embryos.</a> Toxicol Sci. 113, 177-186 (2010).</li><li>Arnolds, D. E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Physiological+effects+of+tricaine+on+the+supramedullary/dorsal+neurons+of+the+cunner,+Tautogolabrus+adspersus.">Physiological effects of tricaine on the supramedullary/dorsal neurons of the cunner, Tautogolabrus adspersus.</a> Biol. Bull. 203, 188-189 (2002).</li></ol>

This protocol has been used to measure the neural activity of adult zebrafish in vivo. With practice, neural activity can be observed consistently, though the characteristics (amplitude and shape of events) of the recorded activity can vary between individual fish. Utilization of the extracellular recording technique can explain this observation. The method provides simultaneous monitoring of a large number of cells within a region1, so variations in the positioning of the primary electrode can play a...

In this article, a protocol is described for obtaining in vivo recordings of neural activity in adult zebrafish. Extracellular recording methods are used, providing voltage measurements of electrical activity within a small region of neural tissue. This method of investigation involves monitoring a large number of cells in a behaving animal1. Previously, slice recordings have been performed in both adults and larvae, as have eye cup preparations and electroretinogram recordings. These experiments have largely been performed to detail physiological responses of various sensory systems2-5. Until recently, intact brain preparations have only been available for performing electrophysiology with zebrafish larva3,6,7, where respiration and oxygen diffusion can occur through the skin. Our preparation allows the native neurological activity of an adult zebrafish to be measured while the animal remains fully conscious and aware of its surroundings.
Zebrafish (Danio rerio) currently play a fundamental role as a model for genetic, toxicological, pharmacological, and physiopathological studies3.&#160;Zebrafish have gained visibility within the field of neuroscience because they share extensive homology with mammals at the genetic, neural and endocrine levels8. Over the past decade, standard neuroanatomic and immunohistochemical techniques have been used to determine the detailed characteristic organization of the zebrafish nervous system9-12 and of the distribution of different neurotransmitters3,8,13. More recently, researchers have shifted their focus to functional studies14,15, many of which center on behavioral processes16-19 and electrophysiological characteristics of sensory systems2,13,20. A small number of these studies have concentrated on the electrical activity of specific areas of the adult zebrafish brain21-23, but were not carried out using an in vivo approach.
This protocol can be adapted for electrophysiological studies of both spontaneous and evoked activity within the zebrafish nervous system to describe the patterns of activity in specific brain regions. The use of this technique allows comparisons to be made between the neurological activity of young larval stages and adults. Further, our protocol permits comparisons between genetic or pharmacological alterations. Together with other approaches, such as genetic engineering or pharmacological tests, this method offers a new possibility for the functional analysis of neuronal communication and plasticity in the intact adult animal as well as for potential applications, such as studying late onset epilepsy or neurodegenerative processes.

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			<td height="43" style="height:43px;width:207px;">70% Ethanol</td>
			<td style="width:91px;">Decon Laboratories</td>
			<td style="width:111px;">2750HC</td>
			<td style="width:132px;">Dilute 100% to 70% with DI water</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">2 M Potassium Chloride</td>
			<td style="width:91px;">J.T. Baker</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">2 M Sodium Chloride</td>
			<td style="width:91px;">J.T. Baker</td>
			<td style="width:111px;">3624-05</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="47">
			<td height="47" style="height:47px;width:207px;">0.4% Tris-Buffered Tricaine</td>
			<td style="width:91px;">Sigma-Aldrich</td>
			<td style="width:111px;">E10521</td>
			<td style="width:132px;">pH 7.2-7.4; stored at -20 oC</td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">Pancuronium Bromide</td>
			<td style="width:91px;">Sigma-Aldrich</td>
			<td style="width:111px;">P1918</td>
			<td style="width:132px;">Diluted to 1 &#956;g/&#956;l in 1x phosphate buffered saline</td>
		</tr>
		<tr height="127">
			<td height="127" style="height:127px;width:207px;">Habitat water</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;">pH 7.0-7.4, conductivity of 400-450 &#956;S; maintained by Instant Ocean and Sodium Bicarbonate</td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">Pentylenetetrazol</td>
			<td style="width:91px;">Sigma-Aldrich</td>
			<td style="width:111px;">P6500</td>
			<td style="width:132px;">Diluted to 300 mM in 1x phosphate buffered saline</td>
		</tr>
		<tr height="85">
			<td height="85" style="height:85px;width:207px;">Nanofil syringe</td>
			<td style="width:91px;">World Precision Instruments, Inc.</td>
			<td style="width:111px;">06A</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="85">
			<td height="85" style="height:85px;width:207px;">34 G Beveled needle</td>
			<td style="width:91px;">World Precision Instruments, Inc.</td>
			<td style="width:111px;">NF34BV</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Sponge</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;">Small pore and chemical-free</td>
		</tr>
		<tr height="47">
			<td height="47" style="height:47px;width:207px;">Foam-backed fine sand paper</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;">5 x 5 cm2 is large enough</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">9 V Battery</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">Wires with alligator clips</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;">Need 2</td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">37 cm x 42 cm Kimwipe</td>
			<td style="width:91px;">Kimberly-Clark Professional</td>
			<td style="width:111px;">TW31KEM</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">11 cm x 21 cm Kimwipe</td>
			<td style="width:91px;">Kimberly-Clark Professional</td>
			<td style="width:111px;">TW31KWP</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">1/8 in diameter tube</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">1 cm diameter tube</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">1 mm diameter tube</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
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		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Reducing valve with female Luer lock cap and silicone ferrule</td>
			<td style="width:91px;">Qosina</td>
			<td style="width:111px;">51505</td>
			<td style="width:132px;"></td>
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		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Microscope (Leica MZ APO)</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;">Another microscope can be used</td>
		</tr>
		<tr height="85">
			<td height="85" style="height:85px;width:207px;">Vanna scissors</td>
			<td style="width:91px;">Roboz Surgical Instruments Co., Inc.</td>
			<td style="width:111px;">15018-10</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="85">
			<td height="85" style="height:85px;width:207px;">60 ml Luer lock syringe tubes</td>
			<td style="width:91px;">Becton, Dickinson and Company</td>
			<td style="width:111px;">309653</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">3-way Stopcocks with Luer connections</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">1-way Stopcock with Luer connection</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
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		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Fisherbrand 100 mm x 15 mm Petri dish</td>
			<td style="width:91px;">Fisher Scientific</td>
			<td style="width:111px;">NC9299146</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Fisherbrand 60 mm x 15 mm Petri dish</td>
			<td style="width:91px;">Fisher Scientific</td>
			<td style="width:111px;">S67961</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">4 in Borosilicate capillary tube</td>
			<td style="width:91px;">World Precision Instruments</td>
			<td style="width:111px;">TW100F-4</td>
			<td style="width:132px;">Can contain a filament to aid in filling with solution</td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">P-97 Flaming/Brown Micropipette Puller</td>
			<td style="width:91px;">Sutter Instrument Co.</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Digidata 1440</td>
			<td style="width:91px;">Molecular Devices</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Axon Aloclamp 900A</td>
			<td style="width:91px;">Molecular Devices</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Axoclamp software</td>
			<td style="width:91px;">Molecular Devices</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">HS-9Ax 1U headstage</td>
			<td style="width:91px;">Molecular Devices</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">0.010 in Silver wire</td>
			<td style="width:91px;">A-M Systems, Inc.</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Q-series electrode holder</td>
			<td style="width:91px;">Warner Instruments</td>
			<td style="width:111px;">QSW-A10P</td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">10 ml Luer lock syringe</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="64">
			<td height="64" style="height:64px;width:207px;">1 mm x 15 in Tubing</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;">Connect Luer lock syringe to Q-series electrode holder</td>
		</tr>
		<tr height="43">
			<td height="43" style="height:43px;width:207px;">Micromanipulator</td>
			<td style="width:91px;">Warner Instruments</td>
			<td style="width:111px;"></td>
			<td style="width:132px;">Need 2</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">Microsoft-based PC</td>
			<td style="width:91px;">Dell</td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">Faraday Cage</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;width:207px;">Air Table</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:207px;">Dissecting Microscope</td>
			<td style="width:91px;"></td>
			<td style="width:111px;"></td>
			<td style="width:132px;"></td>
		</tr>
	</tbody>
</table>

electrophysiological recording in the brain of intact adult zebrafish

Previously, electrophysiological studies in adult zebrafish have been limited to slice preparations or to eye cup preparations and electrorentinogram recordings. This paper describes how an adult zebrafish can be immobilized, intubated, and used for in vivo electrophysiological experiments, allowing recording of neural activity. Immobilization of the adult requires a mechanism to deliver dissolved oxygen to the gills in lieu of buccal and opercular movement. With our technique, animals are immobilized and perfused with habitat water to fulfill this requirement. A craniotomy is performed under tricaine methanesulfonate (MS-222; tricaine) anesthesia to provide access to the brain. The primary electrode is then positioned within the craniotomy window to record extracellular brain activity. Through the use of a multitube perfusion system, a variety of pharmacological compounds can be administered to the adult fish and any alterations in the neural activity can be observed. The methodology not only allows for observations to be made regarding changes in neurological activity, but it also allows for comparisons to be made between larval and adult zebrafish. This gives researchers the ability to identify the alterations in neurological activity due to the introduction of various compounds at different life stages.

This protocol has been used to measure the neural activity of adult zebrafish in vivo. These electrophysiological recordings are consistently and reproducibly obtained. Figure 5 shows a representative example of native and induced alterations of the neural activity of an adult zebrafish when pentylenetetrazol (PTZ), a common chemoconvulsant6,7,25,26, is introduced in the intubation setup.
The native neurological activity of the adult zebrafish was monitored...

Watch this Scientific Journal Video about Electrophysiological Recording in the Brain of Intact Adult Zebrafish at JoVE.com

Electrophysiological Recording in the Brain of Intact Adult Zebrafish

This paper describes how an adult zebrafish can be immobilized, intubated, and used for in vivo electrophysiological experiments to allow recordings and manipulation of neural activity in an intact animal.

Previously, electrophysiological studies in adult zebrafish have been limited to slice preparations or to eye cup preparations and electrorentinogram ...

Research

JoVE Journal

Neuroscience

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Voltage responses of insect photoreceptors and visual interneurons can be accurately recorded with conventional sharp microelectrodes. The method ...

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Wireless Electrophysiological Recording of Neurons by Movable Tetrodes in Freely Swimming Fish

The neural mechanisms governing fish behavior remain mostly unknown, although fish constitute the majority of all vertebrates. The ability to record brain ...