Channelled Wrack

Pelvetia canaliculata

  1. Wildlife
  2. Seaweeds and grasses
  3. Channelled Wrack


A very common seaweed, Channelled Wrack grows around the high water mark on sheltered, rocky shores. Living on the upper shore, it is very tolerant of desiccation and can survive for up to eight days out of the water. In fact, if it is fully submerged for too long, it may die. Channelled Wrack can live for up to four years.

How to identify

A smallish brown 'wrack' seaweed, Channelled Wrack can be recognised by the obvious 'channels' that its frond form - produced by their sides being rolled in. Lighter-coloured, bumpy, v-shaped swellings at the ends of the fronds are its reproductive structures.

Where to find it

Common on rocky shores all around our coasts.


When to find it

  • January
  • February
  • March
  • April
  • May
  • June
  • July
  • August
  • September
  • October
  • November
  • December

How can people help

Seaweeds provide a vital link in the food chain for many of our rarer species. Our seas and coastline are in need of protection if we are to keep our marine wildlife healthy. The Wildlife Trusts are working with fishermen, researchers, politicians and local people towards a vision of 'Living Seas', where marine wildlife thrives. This work has recently had a massive boost with the passing of the Marine Bill, promising sustainable development of the UK's marine environment. Do your bit for our Living Seas by supporting your local Wildlife Trust.

Species information

Common name
Channelled Wrack
Latin name
Pelvetia canaliculata
Seaweeds and grasses
Length: 5-15cm
Conservation status