These are going to scare the thumbs away

They are called banana pingers and will help the small Baltic Sea whale to co-exist with professional fishing.

Drivers, like all whales, are very sound sensitive and are expected to hear the beeps in the long run, while this model is inaudible to humans and seals - the frequency is too high.

- They are not in the way of the fishing itself and we have never seen any bugger, either with or without pingers.

See how they work in the clip above and what the fisherman has noticed.

Thorgrim Christiansson met a tumbler expert, Ida Carlén, at a meeting. She wanted some boats to test the scares and he and one more lined up.

Now he writes reports - a paper for every link, every yarn he puts out and picks up - about how the scares work. Every other yarn has pingers and every other yarn is without, so the researchers can compare.

The first pingers they tested for Ida Carlén attracted seals who heard the beep and quickly learned that there is food here.

- It was a disaster, the seals ate up all the fish in the nets. What we came up with was, at most, slams, chipped half-eaten fish.

The new model with higher frequency began Thorgrim testing last summer and will now continue until September during the summer fishing for shade and turbot an hour outside the home port of Herrvik.

Sweden recently received sharp criticism from the EU for not protecting porpoises sufficiently in the Baltic Sea, not even in the sea area south of Gotland which has biotope protection - Hoburgsbank and Midsjöbankarna.

- But there has been no fishing there for 10 years, says Thorgrim.

Fishing boats over 12 meters must have pingers in the area.

- In the past we got a lot of cod. Now it has been cod stop for 1.5 years, but there was no cod there before either. All catches in the last ten years correspond to one day's fishing in a good or normal place.

Thorgrim has never seen a tumbler during all his years as a professional, except once in the Sound.