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UH Sea Grant's ReefWatchers on the Island of Hawai'i

In its tenth year of existence, the ReefWatcher monitoring program trains volunteers to count fish and invertebrates in selected reef locations around the Island of Hawai'i.

We train volunteers of all ages for three types of monitoring:

  • fish count transects
  • tide pool monitoring
  • coral spawning

Our goal is to provide observation data over long periods of time. The volunteers can monitor for as long as they would like to - some have been monitoring continuously for over seven years and many for much shorter time periods. In the past three years, 185 people have taken the ReefWatcher training and data has been recorded for 16 sites.

While volunteers are needed all year, between March and July is an especially important time as ReefWatchers observe and record the coral spawning activity.

Questions? Contact Chantal Chung at