Big Seaweed Search

Take a walk along the coast and help us monitor the effects of climate change and invasive species on the UK's seaweeds.

Seaweeds are easy to find and occur all around the UK coastline. There are a staggering 650 seaweed species in the UK, around 7% of the world’s species, and they play a vital role in the functioning of the marine environment.

Scientists think that the effects of climate change and the spread of invasive species are starting to have an effect on where they are found but they need more information to be sure.

This is where you can help. Identify the seaweeds you spot on the UK's coast and tell us what you find. This will help researchers from the British Phycological Society and Natural History Museum to find out what is happening to our seaweeds.

About the Big Seaweed Search

Seaweeds support a wealth of life, but they may be affected by invasive species or by climate change. Find out more about the aims of the Big Seaweed Search and what scientists hope to discover.
Why are seaweeds important?

What exactly are seaweeds and what are they used for in everyday life? Although you may not know it, you use them regularly. Find out more.
Types of British seaweed

Identify the different types of seaweed found on British beaches by looking through these images and using our identification tips.
Taking part in the survey

Anyone can take part in the Big Seaweed Search, whatever their experience. Find out how to record your seaweed observations and send them back to the scientists who will be studying them.
Record your results

Submit the results of your seaweed search online so that scientists can use them to study the distribution of British seaweeds.
Results

See your results on the map and follow the progress of the survey all around the country.

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Get involved

Help us find out more about these wonderful organisms by taking part in the Big Seaweed Search. You don't need to be an expert - just use our downloadable guides.