As a compliment to our range of commercial fishing gear accessories, Isi-fish wish to focus on one of the products in our catalogue; the range of bycatch reduction technology from STM, Italy. Entanglement of cetaceans in fishing gear is continually a concern for fishermen, marine managers, and conservationists worldwide. Bycatch in commercial fisheries is probably the most important single threat to many populations of cetaceans in all oceans.
The DDD is an acoustic deterrent that effectively prevents marine mammal bycatch thanks to an efficient technique of interaction with their echo-localization system (sonar). To use the DDD is very simple: the DDD must simply be attached to the fishing gear by being hung on the nets or to the longline. In contact with water, the DDD activates. It transmits modulus signals that interfere with the acoustic perception system of the cetaceans and disrupts their hunt for prey in the nets or lines.The level of the DDD emissions doesn’t produce any harm to mammals or fish. These last are insensitive to the frequencies emitted.
The DiD is the interactive evolution of the standard DDD models. It produces the ultrasounds only when it detects the presence of the dolphins in the area, by means of its “hearing” circuitry, that is activated by the “clicks” emitted by the mammals. The signals produced by the DiD are identical in sequence but random in the intervals in order to prevent the animals from becoming accustomed to the signals. The ability of the DiD to be activated only in the presence of cetaceans improves its efficiency by adding the surprise effect and increases the life of the batteries and the duration of the charge.
Technical Specifications:
Emission frequency from 5 to 500 KHz.
Weight: 905 gr.
Height: 210 mm. Diameter: 61 mm.
Rechargeable internal 1.6 Ah NiMH batteries (sealed).
Max depth: 200 m. (20 bar), min: 10 m.
Isi-Fish is an official reseller for both the DDD and DiD deterrent ‘pingers’ and the range of accessories including single and multi-chargers. Both the DDD and the DiD are suitable for all types of fishing gear - the number of units to be placed and their position depends on the type of gear used and the species of the mammal.
The devices comply with the Regulation of the European Union Council (EC) 812/2004.
For more information contact;
cyrille.bodilis@isifish.fr
