“We have developed a seal-proof, movable, ergonomic and efficient multitrap which can be used on all depths and modified for different purposes,” Lars Hillström says.
The traps are ergonomic as they are lifted by pontons with the help of a compressor. Otherwise, this is heavy work. It is important for the researchers to stimulate coastal fisheries to avoid big trawlers to come in and vacuum the sea.
“Smaller boats use less fuel and we know that big trawlers damage the sea floor. It is fun to develop fishing methods that are environmentally friendly and easy for people to use, and which can promote coastal fishing so that the cultural landscape can get a chance to prosper.”
“The perch aren’t easy to fool”
Lars Hillström points out that the perch are sensitive to change, so the real advantages of the new perch trap are that is adapted to the great sensitivity of the perch and that is does not touch the sea floor.
“We have observed that common traps can disturb the sea floor and that the sea floor in turn can disturb the traps; the perch are not easy to fool.
Earlier, herring used to be fished with traps just beneath the surface, but with the new traps fishers can catch herring at a depth of 50 meters.
“This method makes it possible for us to fish also at other times of the year, for instance in mid-autumn. Fishing will also become selective as small fish can escape from the trap.”
A few years ago, the researchers in Gävle participated in developing another kind of fish trap which has been very successful. Today, fishers from Kamchatka in Russia and the Donau Delta in Romania use these traps.
“We saw how hard they had to work when they used their old gear. Our new equipment also made it much easier for them to, for instance, release protected sturgeons.”
“These are passive traps, because they are not dragged around. As the fish remain unharmed, all fish can be released unharmed. Mikael Lundin’s doctoral dissertation also demonstrates that the survival rate for fish in these traps is high, compared to the trawlers where the survival rate is much lower,” Lars Hillström concludes.