Batticaloa singing fish hydrophone recording: calm slack-water acoustics at Lady Manning Bridge?
What underwater recording hydrophone models and gain settings capture the harmonic humming of estuarine catfish beneath Kallady Bridge during morning high tides?
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3 Answers from travellers
Recording the "singing fish" bioacoustic phenomenon in Batticaloa Lagoon requires dropping calibrated marine hydrophones (such as Aquarian H2a or Cetacean Research C57) to depths of 2 to 4 meters off anchored wooden canoes. Optimal recording occurs during morning slack high water (between 6:30 AM and 8:00 AM) when tidal water movement past bridge pillars halts, eliminating water flow turbulence across the sensor diaphragm. The acoustic signal—produced by stridulating catfish (Arius) and croakers—presents as sustained harmonic hums spanning 80Hz to 1.2kHz, resembling a plucked cello chord.
Outboard motor traffic on the lagoon generates heavy low-frequency acoustic masking; schedule recording sessions on calm weekday mornings.
Snapping shrimp colonies on the concrete bridge pilings generate high-frequency crackling noise (2kHz-10kHz); apply a digital bandpass filter during post-analysis.
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