Fish talk-os: Studying electrocommunication in the wild

Fish talk-os: Studying electrocommunication in the wild
Jörg Henninger recording the activity of weakly electric fish in Darien, Panama. Credit: Jan Benda

A field study published in JNeurosci of tropical fish in Central America reveals how the animals use electric fields to communicate in their natural habitat to accomplish coordinated behaviors including mating and reproduction.

The communication system of weakly electric ghost knifefish (Apteronotidae) has been previously studied in laboratory experiments.

Taking a more naturalistic approach, Jan Benda,Jörg Henninger and colleagues recorded electric fields emitted by Apteronotus rostratus in a stream in the Panamanian rainforest, which enabled the researchers to study individual social interaction in detail.

The researchers discovered that the signals were markedly different in their natural context than those from previous studies in the lab.

They found that brief electric "chirps" were used to attract mates while a special long chirp was used by females to signal males to fertilize their eggs.

Previous electrophysiological studies have not addressed key features of the observed natural sensory stimuli, highlighting the need to study behavior and sensory scenes in the natural environment.

Courtship and spawning in the wild, interrupted by an intruder. Recorded in Darién, Panama in May, 2012. Replay at 2x real-time.Species: Apteronotus rostratusFish location: colored circlesChirps: large transparent circles and short tones played at the fish's discharge frequency The interactions of electric fish in the natural habitat are inaccessible to visual observation. Therefore, location and communication were extracted directly from the fish's own electric discharges. Credit: Henninger et al., JNeurosci (2018)
Fish talk-os: Studying electrocommunication in the wild
Juvenile of the brown ghost knifefish (Apteronotus leptorhynchus). Credit: Guy l'Heureux

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More information: Statistics of natural communication signals observed in the wild identify important yet neglected stimulus regimes in weakly electric fish, JNeurosci (2018). DOI: 10.1523/JNEUROSCI.0350-18.2018
Journal information: Journal of Neuroscience

Citation: Fish talk-os: Studying electrocommunication in the wild (2018, May 7) retrieved 28 February 2020 from https://phys.org/news/2018-05-fish-talk-os-electrocommunication-wild.html
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