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.
Sargasso seaweed, a brown algae, was initially discovered in 1985 in northern Bohuslän and has since become prevalent along the Swedish west coast.
In English the species name is "clinging jellyfish" in Swedish it is called “klängmedusa”.
The Japanese Giant Oyster is larger than our domestic variety, and its edges are so sharp that medical services on the west coast have issued warnings to bathing tourists.
This is what it looks like when cormorants have taken over an island in Stockholm’s archipelago. It’s not exactly attractive when you were expecting green skerries and peacefully lapping waves.
The small but spectacularly beautiful comb jelly Mnemiopsis leydyi, can reproduce at a dismaying speed, and copes with warm and cold water and even different amounts of salinity. And when it spreads to areas where it isn’t naturally found, it can cause devastating damage. As in the Black Sea in the 1980s.
The most likely scenario is that the beautiful red lionfish spread into the sea off the coast of Florida when an aquarium was smashed by Hurricane Andrew thirty years ago, writes the US National Oceanic and Atmospheric Administration (NOAA). Today, the red lionfish is completely dominant along the US coast and is out-competing other species in the ecosystem.
The invasive fish species black-mouthed goby is already present along the Baltic coast. But now the fish species has made its way far up into the Bothnian Sea, writes Örnsköldsvik's Allehanda
The burning clinging jellyfish was discovered in 2018 and has found its way home in the water at Lilla Askerön, in Bohuslän. Ideally, it wants to live in the eelgrass meadows that the researchers are now restoring in the area
