The Marine Conservation Society and Natural History Museum are calling on coastal explorers across the UK to join the Big Seaweed Search Week.

Running from 26 July to 3 August 2025, the citizen science project invites people of all ages to hit the beach, hunt for seaweed and help track the impact of climate change on our shores.

Scientists from the Marine Conservation Society and Natural History Museum are keen to learn more about where different types of seaweed grow across the UK, and how their distributions may be changing over time.

Anna Bunney, citizen science programme developer, Marine Conservation Society, said, “Seaweed plays a really important role in keeping our ocean healthy.

"There’s still a lot we don’t know, and that’s where the Big Seaweed Search comes in. The more people join in, the better we can understand what’s happening beneath the waves and how to safeguard our seas for future generations.

“The great thing is, anyone can take part – you don’t need to be an expert or live near the coast. Just one trip to the beach is enough to contribute to this important research. It’s a brilliant, easy activity to enjoy with friends or as a group, while also advancing our shared understanding of the marine environment.”

While there are over 650 seaweed species around the UK, Big Seaweed Search Week focuses on just 14 that are good indicators of environmental change. The data collected from the Big Seaweed Search will be fed into the Museum’s Data Ecosystem, allowing researchers to monitor long-term environmental changes and the potential impact on marine life.

Professor Juliet Brodie, research leader, Natural History Museum, said, “The Big Seaweed Search is already shaping important scientific research.

“Data gathered has contributed to the UK Red List, highlighting seaweed species that are vulnerable or under threat. This information plays a vital role in guiding conservation efforts to protect these essential marine species and ensure the health of our ocean for years to come.

“It’s also inspired similar projects in places like South Georgia and Mexico. Working alongside passionate community scientists who share our commitment to a healthy ocean is truly empowering.”

Taking part in Big Seaweed Search Week is simple and open to everyone. There are training videos and downloadable resources available, including an identification guide to help spot the 14 species and instructions on how to take part. Join the search here.