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Porpoise - PAL (pat.)

The Porpoise-PAL imitates alerting signals of porpoises at their ultrasonic communication frequency of 133 kHz. Optimised for the use in fisheries. A bycatch reduction of around 80 % in the Western Baltic Sea (Chladek et al. 2020; Fish Res) was Independently proven by the Thünen-Institute of Baltic Sea Fisheries.

Porpoise-PAL ultrasonic clicks are not audible by fish, most other animal species and seals: attraction to the nets or depredation on fish were not observed.
Key features Porpoise - PAL:
  • Waveform: narrow band porpoise clicktrain
  • Frequency:  133 kHz porpoise clicks
  • Signal Duration: 1 s
  • Signals: 1-3 random
  • Repeat Interval: 8 – 24 s randomized
  • Sound level: 145 dB re 1µPA @ 1 m peak
  • Spacing: 180 - 200 m on float line

The Porpoise-PAL has a very robust, black, UV-protected housing. To increase safety on board, it is light, buoyant and has an internal shock-absorber. Designed, manufactured and tested in Germany. Two year warranty against manufacturing defects.
Key features:
  • Proven bycatch reduction
  • Independently tested
  • Spindle shaped
  • Easy to deploy
  • Audible functionality check
  • Very durable, UV protected
  • Replaceable battery
  • Rated to 320 m depth 
Technical specifications:
  • Data recording (optional): total time, deployment time, temperature, signal generation
  • 250 g light, buoyant in water, helps pull nets open
  • 185 mm long, 60 mm diameter 
  • Dual attachment through 6 mm and 11 mm holes at each end
  • Approximate battery life (temperature dependent):
    • 4 years shelf life
    • up to 2 years typical use
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Frequently asked questions

If you have any questions regarding PAL, its deployment and effect, please check FAQ here and feel free to contact us.

>>> PAL-Types
>>> FAQ
>>> PR


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  • HOME
  • FORSCHUNG
  • PRODUKTE
    • Übersicht
    • Schweinswal - PAL
    • 10 kHz - PAL
    • Breitband - PAL
    • Wal - PAL
    • Fragen & Antworten
  • PR
    • Aktuelles
    • Bewertungen
    • Medien
  • KONTAKT
    • Kommunikation
    • Partner
    • Impressum
    • AGB
    • Datenschutzerklärung
  • HOME
  • RESEARCH
  • PRODUCTS
    • Overview
    • Harbour Porpoise - PAL
    • 10 kHz - PAL
    • Wideband - PAL
    • Whale - PAL
    • FAQ
  • PR
    • News
    • Feedback
    • Media
  • CONTACT
    • Communication
    • Partners
    • Imprint
    • Terms & Conditions
    • Data Privacy Statement