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.
Did you know?…
Over 1,000 marine wildlife sightings were reported to MCS last year
Last year, over 300 Seasearch divers spent over 8 weeks surveying underwater
Over 15,000 marine species are found in UK seas
Find out more about UK species.