© Jack Versiani Holt

We want to hear about the wildlife you spot at the coast and at sea, especially basking sharks, marine turtles and jellyfish in UK and Irish waters.

Please click on the options below to report your sightings. Your sightings provide vital information for our scientists and help us come up with solutions to protect our precious sealife.

(To report a sighting you will need to log in to the website, this helps us ensure the validity of the data. If you do not have an account it’s easy to create one.

© Jack Versiani Holt

Marine turtles

Tell us about your turtle sightings

© Kate Hutchingson

Basking sharks

Tell us about your basking shark sightings

© Jack Versiani Holt

Interactive sightings map

© Calum Duncan


Tell us about your jellyfish sightings

© Chris Wood


Tell us about your crawfish sightings

Underwater surveys

Seasearch is a project for volunteer sports divers

Did you know?…

Over 15,000 marine species are found in UK seas

Over half a million people have voiced their support for ‘marine protected area’ designation in the UK through our campaigns

Over 1,000 marine wildlife sightings were reported to MCS last year

Want to know more about Jellyfish?

Jellyfish Guide Find out more about UK species.

Download our guide