11/06/2026
We had a few concerned comments on a post featuring sargassum recently. Thatās because itās an invasive seaweed! It was first recorded in the UK on the Isle of White in 1971. When held up, it resembles a laundry line.
Itās not great to find this algae as it tends to be a nuisance to other species and humans alike - blocking out light, getting stuck in propellers, growing and colonising spaces quickly and becoming fierce and abrasive competition. Itās not even good to eat this seaweed.
So shouldnāt we just remove it?
Well thereās a great level of care needed when removing sargassum. Because it can regenerate from a small piece, sometimes big removal efforts have led to more dense and vigorous regrowth!
In this instance, itās recommended that if you see it, do think about whether you can safely remove it (including the holdfast, the root like part where it attaches). Hand removal might actually be the best way to go.
If youāve done this or even if youāre just in amongst it in a place with sargassum, make sure you also wash and dry any kit afterwards and ensure biosecurity. Clean, check, dry!
Itās a good idea to designate a person in your group to report it. Please share details of Sargassum via iRecord.
Any new invasive non-native species should be reported to NatureScot ([email protected]) and Marine Directorate ([email protected]). This should include grid coordinates when possible.