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A generalized model for communicating individuality through teleost swim bladder modulation
Cameron A Matthews1, Pierre-Philippe J Beaujean2
1Naval Surface Warfare Center, Panama City Division, 110 Vernon Ave, Panama City, FL 32407 USA cameron.matthews@navy.mil.
Biology Open
|May 2, 2018
Summary
This study proposes that fish use swim bladder envelope modulation to communicate size. By analyzing vocalizations, researchers identified distinct features related to air volume, offering a new perspective on fish sound production.
Area of Science:
- Bioacoustics
- Ichthyology
- Signal Processing
Background:
- The traditional swim bladder model for fish vocalization is debated.
- Fish may use acoustic signals for intraspecific communication, including size assessment.
- Swim bladder mechanics are crucial for sound production in many fish species.
Purpose of the Study:
- To investigate decoupled forced and resonant responses as extractable features in fish vocalizations.
- To explore envelope modulation as a mechanism for fish to convey and perceive conspecific size via swim bladder volume.
- To revise the resonant bubble model by incorporating carrier signal resonance with static or varying swim bladder volumes.
Main Methods:
- A mechanical analog was used to demonstrate envelope modulation for air volume and size identification.
- Two signal processing methods were applied to extract swim bladder volume features: blind amplitude demodulation and cyclostationary analysis of cross-spectral coherent spectra.
- Average frequency content from these methods served as input for correlator functions to identify air volumes, using vocalizations of *Epinephelus guttatus* (red hind grouper) as test signals.
Main Results:
- The study successfully extracted swim bladder volume features using the proposed signal processing techniques.
- Both blind amplitude demodulation and cyclostationary analysis demonstrated potential for identifying air volumes based on vocalization signals.
- The findings support the hypothesis that envelope modulation is a viable mechanism for size signaling in fish.
Conclusions:
- Decoupled forced and resonant responses are identifiable features within variable swim bladder volumes.
- Envelope modulation via the swim bladder is a plausible mechanism for fish to communicate and perceive conspecific size.
- The revised resonant bubble model offers a more comprehensive understanding of fish sound production and its relation to swim bladder dynamics.
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