NIWA aims to provide the knowledge needed for the sound environmental management of our marine resources.

  • Marine heatwaves

    Research Project
    Temperatures around Aotearoa New Zealand are increasing, and not just on land. Amid a changing climate, significant marine heatwaves have impacted Aotearoa over the past decade and are expected to become more frequent and intense.
  • Marine biosecurity

    Introduced pests and diseases can harm the health of Aotearoa New Zealand's marine ecosystems, our seafood industry, and the social and cultural benefits that we derive from the sea.
  • Extreme coastal flood maps for Aotearoa New Zealand

    Decisions about how we adapt to sea-level rise need to be based on information about our exposure to coastal flooding, both now and in the future after a period of rising sea levels.
  • Storm-tide red-alert days 2023

    Storm-tide red alerts are the highest high tide (also known as king tides) dates that Emergency Managers and Coastal Hazard Managers should write in their diaries and keep an eye on adverse weather (low barometric pressure, onshore winds), river levels and sea conditions (waves and swell). This page shows the 2023 dates of the highest high-tide "red alert" dates, and the lowest high-tide dates.
  • Seabed 2030

    Research Project
    NIWA is leading a New Zealand partnership to map the South and West Pacific Ocean's seabed as part of a worldwide initiative to map the entire globe’s seafloor.
  • Freshwater Ecological monitoring

    We offer a range of ecological monitoring tools.
  • Ngā Waihotanga Iho - The Estuary Monitoring Toolkit

    Software Tool/Resource
    The main purpose of Ngā Waihotanga Iho is to provide tools for the public to measure environmental changes that occur in estuaries over time. These changes may occur due to natural processes and/or human activities.
  • Restoration of aquatic ecosystems

    Research Project
    This project aims to increase our knowledge of aquatic ecosystems and their restoration, and apply this to degraded streams, rivers, lakes and estuaries.
  • Black coral on Tokomaru shelf reef

    Seafloor impacts of Cyclone Gabrielle revealed

    Media release
    Scientists have found evidence of sediment impacts on seafloor ecosystems following Cyclone Gabrielle.
  • New study to combat harm caused by anchoring

    Media release
    Ship anchors may cause extensive and long-lasting damage to the seafloor, according to new NIWA research.
  • Mangrove on Athenree Estuary


    NIWA research and tools support the protection, restoration and management of coastal estuarine environments where seawater mixes with freshwater.
  • Athenree Estuary mangrove forest

    Future Coasts Aotearoa

    Transforming coastal lowland systems threatened by sea-level rise into prosperous communities