In the Mellansundet at Kvicksund in Västmanland the sea bream thrives and it spreads easily.
Driving by boat or jet ski through the stands contributes to that.
- It makes our combat work more difficult when people drive back and forth here, says Zsombor Károlyi, nature conservation officer at the county administrative board.
Possible with additional measures
Blocking off the Middle Strait may become possible in the future.
- We have not yet made any such decision, but it may become so if the problem grows, says Zsombor Károlyi.
In the clip, Zsombor Károlyi, nature conservation officer at the county administrative board, talks about the concerns about the spread of sea bream.