The invasive humpback salmon has once again been observed in Swedish waterways, most recently in the Ätran River in Halland. The species has large spawning migrations and its impact on ecosystems is not yet known. It is therefore considered a potential threat to the already severely depleted Swedish Atlantic salmon. Researchers and authorities want to stop its spread before it is too late.
It has a black tongue, a hump on its back and defends its mating grounds to the death - the invasive Russian humpback salmon has become a huge problem in Norway and is also increasing on the Swedish west coast.
