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project image
Photo: Richard Kirby
Participation fee $0
Expenses $20
Spend the time outdoors
Location Ocean
Appropriate for kids yes
Teaching materials yes


Required Gear:

1. A Secchi Disk is a 30 cm, flat, white disk attached to a tape measure or a rope, and weighted from below by a small 200 g weight. Visit the project FAQ for more information on building your Secchi disk and recording data: http://www.secchidisk.org.

2. Free iOS or Android Secchi App


Secchi App


Help study marine phytoplankton.
Build a Secchi Disk and measure water turbidity.

Join seafarers in the global scientific experiment to study marine phytoplankton.

The phytoplankton underpin the marine food chain, so we need to know as much about them as possible. To participate in this project, you'll need to create a Secchi Disk, a tool that measures water turbidity, and use the free iPhone or Android ‘Secchi’ application.

You can take a Secchi Disk reading as often as you wish, every day, once a week, twice a month, or just occasionally. The data you collect will help scientists around the world to understand the phytoplankton.

Join in and help make this the world’s largest public marine biological study.




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