Abstract
The Mauthner (M-) cells, a bilateral pair of medullary neurons in fish, initiate the characteristic “C-start” predatory escape response of teleosts. Similar movements have been described during hatching, social interactions, and feeding. M-cell firing, however, has not been correlated directly with these other behaviors. The objective of this study was to determine whether the M-cell, in addition to escape, plays a role in feeding.
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1.
Goldfish were chronically implanted with electrodes positioned near the axon cap of one of the two M-cells. Subsequently, M-cell activity was monitored for up to 8 days while fish were surface feeding on live crickets.
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2.
The M-cell fires and the fish performs a C-shaped flexion in association with the terminal phase of prey capture. Thus, the M-cell is active in the context of at least two behaviors, predator escape and prey capture, and may be considered a part of behaviorally shared neural circuitry.
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3.
For the goldfish, Mauthner-initiated flexions during feeding rapidly remove the prey from the water's surface and minimizes the fish's own susceptibility to surface predation. Other species may possess a diverse repertoire of Mauthner-mediated feeding behaviors that depend on their adaptive specializations for predation. Moreover, group competition between predators and their prey may have facilitated a “neural arms race” for M-cell morphology and physiology.
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Canfield, J.G., Rose, G.J. Activation of Mauthner neurons during prey capture. J Comp Physiol A 172, 611–618 (1993). https://doi.org/10.1007/BF00213683
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DOI: https://doi.org/10.1007/BF00213683