An Icelandic company has developed a technology for prawn fishing that uses light to herd prawn up from the sea floor. This allows the fishing equipment to remain off the sea floor, leading to less disturbance of the environment and lower emissions than conventional trawling. The technology is set to be put on the market soon.
Herding prawn with light
“We are developing the next generation of fishing equipment. Fishing equipment that can fly close to the bottom without touching the bottom. Then we have a light that herds,” Halla Jónsdóttir, founder of Optitog, told RÚV reporters. Optitog has named this patented light beam technology “Virtual Trawl” and has data that shows that it results in higher yields, compared to using the equipment with the light off.
“We have a special light that forms a sort of wall or line in the sea and we see that it works to herd [the prawn].” The prawn swims ahead of the light, up off the sea floor and into the nets. It’s possible to set the equipment so that it travels a consistent distance above the sea floor, for example 30 centimetres [11.8 inches].
Because Optitog’s equipment does not trawl along the sea floor, it encounters 30% less resistance than conventional trawling, meaning the method drastically reduces fuel consumption. By leaving the sea floor largely undisturbed, the new technology also reduces CO2 emissions caused by disturbing organic material on the bottom of the ocean.
Halla says that a Norwegian party is working to put Optitog on the market as an environmentally-friendly fishing technology. Halla believes the technology could be applied to fishing other species.