Species of the Month August 2023

Bladderwrack (Fucus vesiculosus)

Bladderwrack is a large brown seaweed common on the middle shore which can be easily recognised by the paired "bladders" (pockets of air which allow the seaweed to float upright), as shown in the picture to the left. These bladders are either side a prominent mid-rib, and the edges of this species are non-serrated. This NMBAQC pictoral guide to Fucus species shows some of the varying forms you may find depending on environmental conditions (pg 13-19)

You can find more information and images of Bladderwrack on MarLIN, The Seaweed Site and the Wildlife Trust.

Bladderwrack is found along the whole coastline of Wales, but we only hold 541 records at SEWBReC. You can view the 1km density map for SEWBReC here and the 10km Wales wide distribution here.

If you spot a Bladderwrack during August (or at any other time of year), please send us the record, ideally via SEWBReCORD or the LERC Wales App. Instructions on how to submit records are available here.