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Anchialine Ecosystems focus of international symposium on Hawaiʻi Island

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The 5th International Symposium on Anchialine Ecosystems is underway on Hawai‘i Island, where more than 125 scientists, students, community members, and resource managers, from across Hawai‘i and around the world, have gathered to share knowledge and information about anchialine pools. 

  • Kekaha Kai anchialine pond. PC: DLNR Hawaiʻi.
  • A newer wai ‘ōpae in an ʻaʻa lava field in Kona. PC: DLNR Hawaiʻi.
  • A wai ‘ōpae at low tide in Kona with signature cyanobacteria crust. PC: DLNR Hawaiʻi.
  • Metabetaeus lohena. PC: DLNR Hawaiʻi.
  • ‘Ōpae ‘ula grazing on algae. PC: DLNR Hawaiʻi.
  • ‘Ōpae ‘ula grazing on algae. PC: DLNR Hawaiʻi.

Troy Sakihara, an aquatic biologist with the DLNR Division of Aquatic Resources is one of the organizers of this week’s symposium. In opening remarks today, he said the symposium is grounded in the importance of the collective kuleana to culture and place. Hawai‘i has one of the highest concentrations of brackish water, near-coast anchialine pools in the world, with an estimated 600 or more on Hawai‘i Island, mostly along the Kona Coast. 

Anchialine pools were the first sources of fresh water for early Hawaiians, so they have great cultural significance, which has continued into modern times. This was highlighted in many of the scientific presentations Thursday morning, including one by a trio of students from a Hawaiian immersion school at Keaukaha who presented their remarks entirely in ʻŌlelo Hawai‘i. 

A trio of students from a Hawaiian immersion school at Keaukaha presented their remarks entirely in ʻŌlelo Hawai‘i. PC: DLNR Hawaiʻi.

Like so many of Hawai‘i’s natural and cultural resources, anchialine ecosystems have already been destroyed or are threatened by development, pollution, and invasive species; in the case of the pools by invasive fish like guppies and tilapia. 

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The best-known of the native inhabitants of anchialine pools is the ‘ōpae‘ula, a tiny red shrimp. About one-third of the pools on Hawai‘i Island are located at Kaloko-Honokōhau National Historical Park. Several of today’s presentations focused on water quality in the park’s anchialine pools and the use of ‘auhuhu, a Polynesian introduced plant to control invasive fish and the associated recovery of the natural ecosystem. 

The symposium is heavy on science, but with the overall message that anchialine ecosystems continue to be an important and vital connection to our natural and cultural landscape and history. 

5th International Symposium on Anchialine Ecosystems (Nov. 3, 2022). PC: Hawaiʻi DLNR.

In addition to DAR, other sponsors and contributors to the symposium include, the DLNR Division of Forestry and Wildlife, the DLNR Division of State Parks, Hawai‘i Wildlife Fund, Hui Loko, The Nature Conservancy, University of Hawai‘i, US Fish and Wildlife Service, Kamehameha Schools, US Geological Survey, Lili‘uokalani Trust, He‘eia Bay Forever, Hawai‘i Fish Habitat Partnership, Hawai‘i Mountain Running, National Park Service, Kuaaina Ulu ‘AuamoHawai‘i Coral Reef Initiative, David Shepard Hawai‘i, Mauna Lani Auberge Resorts, and Four Seasons Resort.

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“This broad partnership,” Sakihara said, “demonstrates how important this underground system of pools is and why we need to do everything we can to protect and restore them.” 

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