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Noise-Dependent Fish Distribution in Kelp Beds.

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Marine marbled rockfish (Sebastiscus marmoratus) use sound for communication and habitat selection. Acoustic cues are vital for pelagic larvae choosing settlement habitats, matching their hearing to environmental noise.

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Auditory evoked potentialHabitat typeRockfishSettlementUnderwater noise

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Area of Science:

  • Marine biology
  • Bioacoustics
  • Ichthyology

Background:

  • The marine marbled rockfish (Sebastiscus marmoratus) relies on kelp beds and rocky substrates for survival and reproduction.
  • Understanding sensory ecology is crucial for marine species conservation.

Purpose of the Study:

  • To investigate the relationship between sound production and hearing sensitivity in Sebastiscus marmoratus.
  • To determine habitat preferences of juvenile and adult rockfish.
  • To analyze underwater noise spectra in different macroalgal habitats.

Main Methods:

  • Recording underwater noise in Sargassum horneri and Ulva pertusa habitats.
  • Measuring sound production and hearing sensitivity of Sebastiscus marmoratus.
  • Observing habitat selection behavior of juvenile and adult rockfish.

Main Results:

  • Sound production and hearing sensitivity in Sebastiscus marmoratus are closely matched in the frequency domain.
  • Juvenile rockfish prefer habitats with larger macroalgae (Sargassum horneri), while adults prefer habitats with smaller algae (Ulva pertusa).
  • Background noise spectra differ significantly between Sargassum horneri and Ulva pertusa habitats.

Conclusions:

  • Acoustic cues play a critical role in habitat selection for pelagic larvae of Sebastiscus marmoratus.
  • The matching of hearing sensitivity to environmental soundscapes may influence rockfish distribution.
  • Habitat-specific acoustic environments can impact early life stages of marine fish.