Dolpinger Li-18 Dolphin Pinger

DOLPINGER Li-18 is a locally developed acoustic deterrent technology that helps protect your nets and reduce catch losses, with an operating time of up to 18 hours.

It is a professional acoustic deterrent system developed to reduce dolphin-related net damage and catch losses in fishing operations. Developed and manufactured in Turkey, this innovative technology automatically activates upon contact with seawater, immediately providing protection.

The device generates random acoustic signals that continuously vary between 5 kHz and 400 kHz. Thanks to its adaptive frequency algorithm, the likelihood of marine mammals becoming accustomed to the emitted sounds is reduced, ensuring long-term effectiveness.

The DOLPINGER Li-18 is specifically designed for gillnets, aquaculture facilities and professional fishing operations.

Key benefits

• Up to 18 hours’ operating time
• Developed and manufactured in Turkey
• Specifically designed for marine conditions
• Maintenance-free compact design
• Corrosion-resistant epoxy body
• Automatic operation with a smart water sensor
• Reduce your costs: Prevents net repair costs and labour loss. Extends the life of your net.
• Boost Fishing Efficiency: Ensures maximum profit per trip by preventing dolphins from consuming or startling the fish in the net.
• Respectful of the Marine Ecosystem: Causes no physical harm to marine mammals. It simply creates an acoustic barrier to keep them at a safe distance.
• Save Time: Offers ‘fit-and-forget’ convenience thanks to its smart sensors. Creates no extra workload during operations.
• 1-year one-to-one product replacement guarantee against manufacturing defects

Principle of operation

The device begins operating automatically the moment it is placed in seawater, thanks to the smart conductive sensors in its body. It emits high-power acoustic signals at random frequencies that continuously vary between 5 kHz and 400 kHz. Marine mammals (dolphins) become accustomed to fixed-frequency sounds over time and may approach the device. The DOLPINGER Li-18’s advanced adaptive frequency algorithm constantly scrambles the sound sequence. This makes it impossible for the animals to adapt to the sound or build up immunity, ensuring long-term and reliable protection. It switches off automatically as soon as it is removed from the water to save energy.

Dolphins can cause significant damage to nets and result in catch losses whilst attempting to reach fish trapped within them. By helping marine mammals to stay away from nets, DOLPINGER contributes to reducing net damage and ensuring fishing operations are carried out more efficiently.

The device’s effective range may vary depending on environmental factors such as salinity, temperature, water clarity, current conditions and ambient noise.

Field observations have measured the average effective range as:

• an area with a diameter of approximately 600 metres in the Aegean and Mediterranean Seas•

an

area with a diameter of approximately 250 metres in the Sea of Marmara• an area

with a diameter of approximately 400 metres in the Black Sea.

Applications

The DOLPINGER Li-18 can be used safely in all areas of the maritime industry thanks to its compact design and high pressure resistance.

• Trawls, Gillnets and Seine Nets: It can be easily attached to the net’s float or lead line at intervals appropriate to the target species’ depth.
• Aquaculture (Fish Farms): When suspended at strategic angles around the cages, it prevents attacks from external predators.
• Longline Nets: It adapts perfectly to current and depth conditions in bottom and longline fishing.