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You can participate in this project by making a Secchi Disk and downloading the free iOS or Android 'Secchi' application to your smartphone or tablet.

Join in and make this the World’s largest, ongoing Citizen Science marine biological study.


"You don’t need a network connection to use Secchi. Secchi stores all the data until you get a mobile signal when it will ask you if you want to submit your data now, or wait until later."

RK, SV Odontella



The marine phytoplankton account for approximately 50% of all photosynthesis on Earth and, through the plankton food web that they support, they both underpin the marine food chain and play a central role in the global carbon cycle strongly influencing the Earth’s climate.

Living at the surface of the sea the phytoplankton are particularly sensitive to changes in sea surface temperature. A recent study of global phytoplankton abundance over the last century concluded that global phytoplankton concentrations have declined due to rising sea surface temperatures as a consequence of current climate change.

We need to know much more about these changes and you can help by making a simple piece of scientific equipment called a Secchi Disk and using the Secchi App.

Read about the Project in The Marine Scientist:

Measuring Phytoplankton

Download the Project Overview:

Project overview