New law expands Hauraki Gulf marine protection

October 09, 2025

A groundbreaking new law has nearly tripled the protected marine area within the Hauraki Gulf / Tīkapa Moana, New Zealand’s largest and most iconic marine park. Spanning more than 1.2 million hectares around Auckland and the Coromandel Peninsula, the gulf is now entering a new era of conservation.

While this is a milestone for marine protection, it comes with compromises—most notably, the continuation of certain commercial fishing practices in some zones, which has sparked debate among conservationists.

Expanding marine protection in the Hauraki Gulf

The Hauraki Gulf / Tīkapa Moana Marine Protection Bill, recently passed by Parliament, increases the proportion of the gulf under protection from 6% to 18%. The new law extends two existing marine reserves and introduces:

• 12 High Protection Areas (HPAs)

• 5 Seafloor Protection Areas (SPAs)

These zones safeguard a broader range of marine habitats, including soft sediment ecosystems that were previously underrepresented. They also strengthen opportunities for customary Māori management, enhancing the connection between environmental and cultural restoration.

However, the inclusion of allowances for commercial ring-net fishing within some HPAs weakens their fully protected status. This makes it harder for New Zealand to meet its Global Biodiversity Framework goal of conserving 30% of marine environments by 2030.

Understanding the three levels of protection

The new legislation establishes three main categories of marine protection:

1. Marine Reserves – Completely “no-take” zones where all forms of extraction are prohibited.

2. High Protection Areas (HPAs) – Allow restoration and customary Māori practices while limiting damaging activities.

3. Seafloor Protection Areas (SPAs) – Focus on preserving seafloor habitats while allowing non-destructive activities such as mid-water fishing.

All three types aim to reduce destructive practices like bottom trawling, dredging, and the dumping of waste. Protecting the seafloor is essential for carbon storage, nutrient cycling, fish nurseries, and overall ecosystem health.

HPAs, in particular, promote Māori-led management and allow active restoration projects such as removing invasive kina (sea urchins) and reseeding native shellfish beds. Many are located near regions undergoing significant land-based restoration, helping strengthen land-to-sea ecological connections.

Lessons from New Zealand’s first marine reserve

The Cape Rodney–Okakari Point (Goat Island) Marine Reserve, established 50 years ago, was the nation’s first legislated marine reserve and sits on the northeast coast of the Hauraki Gulf. Under the new law, it will quadruple in size, offering a rare opportunity to study the long-term impacts of marine conservation.

This reserve has shown that protecting predator species such as snapper and rock lobster helps maintain ecological balance—preventing sea urchins from overgrazing kelp forests. Larger fish also contribute more significantly to reproduction and fishery replenishment, meaning protected areas can boost fish stocks even beyond their borders.

The expansion of Goat Island and Te Whanganui-A-Hei (Hahei) reserves will deepen scientific understanding of how reef and sediment ecosystems interact to sustain biodiversity.

Accelerating marine conservation in a changing climate

The Hauraki Gulf faces mounting pressures from overfishing, pollution, invasive species, and climate change. Despite decades of efforts—including the Hauraki Gulf Marine Park Act 2000 and the Sea Change – Tai Timu Tai Pari plan (2016)—successive State of the Gulf reports show that its ecosystems continue to decline.

This new legislation represents a critical step forward, but much more is needed. Stronger coordination between science, policy, and management is essential to prevent ecological tipping points and to restore the mauri (life force) of the gulf.

Beyond the law: the path to true restoration

While the new protections address key threats such as overfishing and seafloor disturbance, many stressors originate on land—particularly sediment runoff, nutrient pollution, and microplastics. Without tackling these, the gulf’s recovery will remain slow and incomplete.

Equally, the law does not directly protect fish, seabirds, and marine mammals that rely on the gulf’s open waters. A holistic, ecosystem-based management approach is needed—one that recognizes the interdependence between ecological health, cultural identity, and economic prosperity.

Final thoughts

The expansion of protected areas in the Hauraki Gulf is a historic victory for New Zealand’s marine conservation, but it’s only the beginning of the journey. True recovery will depend on sustained collaboration between communities, scientists, iwi, and policymakers—to ensure that Tīkapa Moana thrives for generations to come.