On 1 July 2025, NIWA merged with GNS Science to become Earth Sciences New Zealand.

Coasts

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

  • “Very rare find” of ghost shark hatchling

    Media release
    NIWA scientists have made the rare discovery of a days-old ghost shark during a recent survey off the east coast of the South Island.
  • Estuaries

    Education Resource
    An estuary is a partially enclosed body of water formed where freshwater from the land meets and mixes with saltwater from the ocean.
  • Q&A - Bloomin' algae!

    Feature story
    A hot and steamy summer saw Kiwis heading down to rivers and lakes to cool off. But they weren’t the only ones enjoying the warmer weather – algae had a great time too.
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    Summer Series 10: Super snapper! Delicious!

    News article
  • Estuary origins

    In comparison to the vast span of geological time, the estuaries that we see today are very recent coastal features.
  • Critter of the week

    In this blog series, we feature a new critter from our expansive invertebrate collection including pictures of specimens in their unique habitat. The blogs also feature news, links and fun facts that showcase New Zealand’s fascinating marine fauna.
  • Charts

    Publication series
    Charts of coastal bathymetry, sediment, and other information are available for purchase.
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    Summer Series 7: Beware! The golden triangle of the bronze whaler

    News article
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    Summer Series 8: The science of sand

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    Inanga

    Inanga are the predominant species in the modern whitebait fishery.
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    13 Beach types

    Learn about different kinds of beachs and how they form, with diagrams and examples of each type.
  • South coast waves

    Wave hazard research

    Research Project
    NIWA collects wave data, develops and verifies wave forecasting systems, and is developing and producing wave projections.