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POTASSIUM CHLORIDE ADMINISTERED VIA FOUR ROUTES FOR EUTHANASIA OF ANESTHETIZED GOLDFISH ().
J Zoo Wildl Med
October 2023
Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC 27607, USA,
Immersion overdose in tricaine methanesulfonate (MS-222) is ineffective for euthanasia of adult goldfish (), and investigation of alternative techniques is warranted. This study evaluated potassium chloride (KCl) administered via four routes for goldfish euthanasia. Thirty clinically healthy adult goldfish (17.
View Article and Find Full Text PDFThe effect of urethane and MS-222 anesthesia on the electric organ discharge of the weakly electric fish Apteronotus leptorhynchus.
J Comp Physiol A Neuroethol Sens Neural Behav Physiol
May 2023
Laboratory of Neurobiology, Department of Biology, Northeastern University, Boston, Massachusetts, 02115, USA.
Urethane and MS-222 are agents widely employed for general anesthesia, yet, besides inducing a state of unconsciousness, little is known about their neurophysiological effects. To investigate these effects, we developed an in vivo assay using the electric organ discharge (EOD) of the weakly electric fish Apteronotus leptorhynchus as a proxy for the neural output of the pacemaker nucleus. The oscillatory neural activity of this brainstem nucleus drives the fish's EOD in a one-to-one fashion.
View Article and Find Full Text PDFRelationship between oxygen consumption and neuronal activity in a defined neural circuit.
BMC Biol
July 2020
Department Biology II, Ludwig-Maximilians-University Munich, Großhaderner Str. 2, 82152, Planegg, Germany.
Background: Neuronal computations related to sensory and motor activity along with the maintenance of spike discharge, synaptic transmission, and associated housekeeping are energetically demanding. The most efficient metabolic process to provide large amounts of energy equivalents is oxidative phosphorylation and thus dependent on O consumption. Therefore, O levels in the brain are a critical parameter that influences neuronal function.
View Article and Find Full Text PDFReconsolidation of fresh, remote, and extinguished fear memory in Medaka: old fears don't die.
Eur J Neurosci
December 2004
Department of Neurobiology, The Weizmann Institute of Science, Rehovot 76100, Israel.
Long-term fear memory in the medaka fish (Oryzias latipes) regains transient sensitivity to a consolidation blocker immediately after memory reactivation in retrieval ('reconsolidation'). Here we show that reconsolidation occurs in fresh long-term memories but not in remote memories, and that the apparent amnesia induced by blockade of reconsolidation can be reinstated by an unpaired reinforcer, a procedure that has no effect on amnesia induced by blockade of consolidation. Extinction memory also undergoes post-reactivation reconsolidation, the blockade of which exposes the previously acquired fear.
View Article and Find Full Text PDFEffect of the anesthetic tricaine (MS-222) on nerve activity in the anterior lateral line of the oyster toadfish, Opsanus tau.
J Neurophysiol
August 2004
Biology Dept., University of Minnesota, 10 University Drive, Duluth, MN 55812, USA.
Inductive neural telemetry was used to record from microwire electrodes chronically implanted into the anterior lateral line nerve of the toadfish, Opsanus tau. Spontaneous neural activity and the response of lateral line fibers to water current were continually monitored from 17 primary afferent fibers before, during, and after the administration of the anesthetic tricaine (MS-222). Significant decrease in spontaneous and evoked activity and increase in interspike interval was noted when anesthetic concentrations were >/=0.
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