A legal battle over Northland crayfish could reshape the way fisheries are managed across Aotearoa, with the Court of Appeal this week considering whether Government catch-limit decisions must be backed by evidence that they can actually deliver the environmental outcomes being promised.
At the centre of the case is Northland’s CRA 1 spiny rock lobster fishery, where declining crayfish populations have been linked to the spread of kina barrens and the disappearance of once-rich kelp forests.
The case follows a major High Court victory by the Environmental Law Initiative and representatives of Ngāti Kaharau me Ngāti Hau, which successfully challenged the Government’s 2023 decision setting the Northland crayfish catch.
The High Court found that decision unlawful.
Now the Government and fishing industry interests are challenging aspects of that ruling in the Court of Appeal, in a case that could establish an important precedent for fisheries management nationwide.
The fundamental question is deceptively simple.
Is it enough for a fisheries decision to say it will help restore an ecosystem — or must there be credible scientific evidence showing the measure is actually capable of doing it?
Crayfish, kina and disappearing kelp forests
To understand why the case matters, you need to look beneath the surface of Northland’s coastal waters.
Crayfish are not simply a valuable species for customary, recreational and commercial fishers.
They are predators with an important ecological role.
Crayfish eat kina.
Kina eat kelp.
When predator numbers become too low, kina populations can increase dramatically and graze entire areas of kelp down to bare rock.
The result is what scientists call a kina barren.
The High Court case examined evidence of this trophic cascade in eastern Northland, where depleted crayfish populations have been associated with widespread loss of kelp forests.
Kelp forests are the ngahere of the moana.
They provide shelter, food, nursery habitat and breeding environments for numerous marine species.
When the kelp disappears, the consequences therefore extend far beyond kina and crayfish.
For iwi and hapū, those consequences also reach into customary fisheries, kaitiakitanga and the ability of future generations to gather kai from healthy coastal ecosystems.
Government already ordered back to the drawing board once
This is not the first time the Northland crayfish fishery has ended up before the courts.
In 2022, the Environmental Law Initiative and Te Uri o Hikihiki hapū successfully challenged Government decisions setting the total allowable catch for Northland crayfish.
The High Court found the 2021 and 2022 decisions unlawful and ordered the Minister for Oceans and Fisheries to reconsider the latest decision using the best available information, including the wider effects of crayfish harvesting on the marine environment.
The Court also emphasised the need for a precautionary approach.
The Government subsequently reconsidered the fishery.
In March 2023, the Minister reduced the CRA 1 Total Allowable Catch from 193 tonnes to 172 tonnes.
The commercial allocation was reduced from 105 tonnes to 89 tonnes, while the recreational allowance fell from 27 tonnes to 22 tonnes.
The recreational daily bag limit was also cut from six crayfish to three.
The customary Māori fishing allowance remained at 20 tonnes.
But that didn’t end the legal battle.
Second challenge — and another High Court loss
The Environmental Law Initiative, alongside Dallas Williams on behalf of Ngāti Hau and Ngāti Kaharau Hapū ki Hokianga, returned to court.
Their argument was effectively that reducing the catch was not enough if there was no sound evidence that the reduction chosen would actually restore crayfish populations sufficiently to address the ecological crisis.
In February 2025, the High Court agreed that the 2023 decision was also unlawful.
The Court found the evidence did not demonstrate that the catch reductions selected were capable of achieving the environmental outcome the Minister was seeking.
It also found the decision was not based on the best available information and that the Minister had failed to properly consider whether a greater reduction in recreational harvesting could more effectively address the kina-barren problem in northeastern parts of the fishery.
That distinction matters.
The issue was no longer simply whether the Minister had considered the environment.
It became whether the actual management measure selected had an evidential foundation showing it could work.
Sustainability before utilisation
One of the most significant findings in the High Court judgment concerned the relationship between fishing and sustainability.
The Court examined section 9 of the Fisheries Act, which includes environmental principles requiring biological diversity in the aquatic environment to be maintained and habitats of particular significance for fisheries management to be protected.
The judgment also drew on the principle that utilisation cannot jeopardise sustainability.
In practical terms, that potentially establishes a much higher bar than simply managing individual fish stocks at a level considered capable of supporting harvesting.
It requires decision-makers to look at what removing a species does to the wider ecosystem.
That is why the Court of Appeal proceedings matter far beyond Northland crayfish.
A precedent for fisheries across Aotearoa
If the High Court’s approach stands, future fisheries decisions could face greater scrutiny over whether the science genuinely supports the environmental outcomes claimed by decision-makers.
For fisheries management, that could mean looking beyond the traditional question of how many fish can sustainably be harvested.
The question becomes broader.
What happens to the ecosystem when those fish are removed?
Predators affect prey.
Prey affect vegetation.
Vegetation creates habitat.
Habitat supports other species.
A catch limit affecting one commercially valuable species can therefore produce consequences throughout an entire marine ecosystem.
The Environmental Law Initiative argues that the Fisheries Act already requires this more ecosystem-based approach and that the best available science must guide decision-making.
Kaitiakitanga also part of the battle
For Ngāti Hau and Ngāti Kaharau, the case has another dimension.
The original challenge also raised questions about iwi and hapū participation and the requirement for decision-makers to have particular regard to kaitiakitanga.
The applicants argued Fisheries New Zealand had not adequately provided for their input and participation in the decision-making process.
The High Court ultimately did not need to reach a final conclusion on all of those arguments because it had already found the Minister’s decision unlawful on other grounds.
But the kaupapa remains important.
For tangata whenua, crayfish — kōura — are not simply units inside a fisheries management model.
They sit within whakapapa connecting tangata, moana and the species living within it.
Kaitiakitanga is therefore concerned not simply with how many kōura can be removed this year, but what kind of moana will remain for generations yet to come.
The fishing industry also has a stake
The consequences of fisheries decisions are not limited to environmental organisations and iwi.
Commercial operators have quota investments, businesses, employees and livelihoods tied to fisheries such as CRA 1.
Catch reductions can impose real economic costs.
The 2023 decision reduced the commercial catch from 105 tonnes to 89 tonnes even though evidence before the later High Court proceedings indicated much of the ecological crisis was concentrated on Northland’s eastern coast and recreational fishing pressure was particularly relevant there.
That raised another management problem.
A broad reduction across the entire CRA 1 area can impose costs on commercial operators elsewhere without necessarily delivering the ecological recovery needed in the places where kina barrens are most severe.
It is one reason more targeted tools — including spatial closures and different management approaches within the fishery — have increasingly entered the discussion.
Fisheries NZ now considering stronger action
The legal battles are already influencing how the Northland fishery is being managed.
Fisheries New Zealand has been consulting on additional measures for CRA 1, including closures and tighter catch settings aimed specifically at restoring predator abundance and addressing kina barrens.
The proposals form part of a broader attempt to restore kelp forests through measures including increasing rock lobster and snapper abundance alongside targeted kina removal.
Fisheries New Zealand has said the objective is to improve resilience and leave more rock lobster in the water for future generations.
That represents a significant shift from simply asking whether the crayfish stock itself can sustain harvesting.
It recognises that the number of crayfish left in the moana may determine the health of other parts of the ecosystem.
A courtroom battle about the future of the moana
On paper, this week’s Court of Appeal case is about administrative law, ministerial decision-making and the interpretation of the Fisheries Act.
Underneath that sits something considerably bigger.
It is about what New Zealand means when it calls a fishery sustainable.
Is sustainability achieved when there are enough crayfish remaining to continue harvesting them?
Or does sustainability require enough crayfish to remain in the ecosystem to perform the ecological role nature gave them?
And if a Minister says a catch limit will help restore that ecosystem, how much evidence should be required before that decision is lawful?
Those questions matter to commercial fishers.
They matter to recreational fishers.
They matter to iwi and hapū exercising kaitiakitanga and customary fishing rights.
And they matter to anyone concerned about the disappearance of Northland’s kelp forests.
The Court of Appeal’s eventual decision could determine much more than how many crayfish can be taken from CRA 1.
It could help determine whether fisheries management in Aotearoa is primarily about managing what we take from the moana — or protecting enough of the ecosystem to ensure there is something healthy left to pass on.
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