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A sensorimotor instability drives a locomotor transition during fish development.

Monica Coraggioso1,2, Leonardo Demarchi1,2, Robert Wong3,4

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Locomotion in zebrafish (Danionella cerebrum) shifts from continuous to burst-and-coast swimming as they grow. This adaptive change conserves energy and is linked to swimming strength, not a fixed developmental plan.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Animal Locomotion

Background:

  • Animals require adaptable movement for survival, with locomotor patterns changing during development.
  • The mechanisms orchestrating flexible and adaptive locomotor adjustments remain poorly understood.

Purpose of the Study:

  • To investigate the developmental transition in locomotion in the miniature fish Danionella cerebrum.
  • To understand the adaptive strategies and underlying principles of sensorimotor control during development.

Main Methods:

  • Observation of locomotor patterns in Danionella cerebrum across developmental stages.
  • Analysis of the energetic costs associated with different swimming styles.
  • Experimental manipulation of sensory feedback to assess its role in locomotion transitions.

Main Results:

  • A distinct shift from continuous to burst-and-coast swimming was observed around 3 weeks of age.
  • This transition was identified as an energy-saving strategy.
  • The change was directly linked to the fish's swimming strength and sensorimotor control instability, rather than a predetermined developmental switch.

Conclusions:

  • Locomotor development is a dynamic process influenced by the interplay of body, brain, and environment.
  • Adaptive locomotion strategies, like energy conservation, are crucial for survival.
  • Danionella cerebrum serves as a valuable model for studying the principles of adaptive movement and sensorimotor integration.