One in 20 Million: The Story of Arapawa's Pāua Reseeding Programme

When pāua spawn, the ocean briefly fills with possibility. A single spawning event can release hundreds of thousands of eggs, fertilised and drifting, beginning their swim through the water column. For nine to ten days, these larvae are free-floating — carried by currents, exposed to every creature that feeds on plankton, vulnerable to temperature shifts and oxygen changes and the thousand small catastrophes that the open ocean delivers without warning.

Of those millions of larvae, the vast majority will not settle. Of those that do, most will be eaten within days. Of those that survive their first weeks, many will fail to find the right substrate, the right depth, the right food source to carry them through their first months of growth.

By the time a wild pāua reaches adulthood — the size at which it can reproduce, at which it contributes back to the population — the odds of it having made it there are roughly one in 20 million.

That is not a crisis in isolation. It is how the species has always reproduced: by producing so many young that even the tiniest fraction surviving is enough to sustain the population. But that calculation depends on one thing — a healthy, abundant, undisturbed ocean to absorb those losses. When the ocean is under pressure, the maths breaks down.

The pressures on New Zealand's wild pāua populations have grown significantly over recent decades. The key threats include:

• Poaching — one of the most persistent problems facing the fishery, with thousands of pāua taken illegally and often undersized each year
• Coastal development — destroying the rocky reef habitats young pāua depend on for settlement and shelter
• Climate variability — shifting water temperatures affecting the seaweed growth that pāua rely on for food
• Overharvesting pressure — even within a well-managed quota system, localised depletion can occur, particularly in accessible near-shore areas

Mike Radon had seen this pattern before. He began diving for abalone in California in 1964, when the ocean still seemed inexhaustible. By the time that fishery closed in the late 1990s, he understood, in a way that only direct witness can teach, what happens when people take more than nature can give back.

When he and Antonia began working with pāua on Arapawa Island in 2001, he carried that knowledge with him. By 2005, when the team began noticing stretches of reef that should have been thick with pāua showing only empty shells and bare rock, the decision to act was not difficult. It was, perhaps, inevitable.

Water flow is checked first thing.

Temperature fluctuations can be lethal to juvenile pāua, and the system that maintains the cool, clean conditions they need requires constant monitoring. Tanks are cleaned regularly — organic matter builds quickly in a living system, and a dirty tank is a stressed tank.

Seaweed is collected fresh from Cook Strait and distributed by hand. Juveniles are observed for signs of disease or unusual behaviour. Water quality is tested. Equipment is maintained. Records are kept.

Then it starts again the next day.

Christmas Day. Stormy nights when the weather comes in off Cook Strait and makes everything harder. Family birthdays. The 4am check when something needs attention and the darkness outside makes the nursery feel very far from the rest of the world.

The ocean does not take holidays. And so, neither do the Radons.

Kayla Hunter, who visited the farm on a tour, described her time viewing the juvenile pāua in their tanks as the highlight of her day — watching thousands of thumbnail-sized creatures clinging to the walls, learning what it takes to give each one a chance. That moment of understanding — of seeing the scale of the work and the scale of the care — is one the Radons have shared with many visitors over the years.

It is not lost on them that most people will never see the nursery. Most people will only ever see the jewellery, or the ocean, or a pāua shell held up to the light. But the work that connects those things happens here, in this room, in the small hours, in all weathers.

"This work has never been just about pāua numbers or fishery quotas," the family has said. "It's about keeping a promise to the ocean that's sustained our family for three decades."

That promise is renewed every morning.

On the 14th of November 2016, a magnitude 7.8 earthquake struck the Kaikoura coastline. In the minutes that followed, the seabed lifted by up to six metres in some places.

The effect on marine life was catastrophic. Pāua that had spent years growing in the subtidal zone were suddenly exposed to air and sunlight. Rocky reefs that had supported dense populations for generations were thrust above the waterline. Millions of pāua died. Entire local populations were effectively wiped out in a single event.

The scale of loss was the kind that takes decades to recover from — if recovery is left entirely to nature.

Arapawa's response was immediate. The team redirected their reseeding efforts toward Kaikoura's devastated coastline. Tank by tank, release by release, through months of the same patient, daily work that defines the programme, they began returning juvenile pāua to the broken reefs.

Today, pāua are thriving again in Kaikoura. It is not a complete recovery — these things take time, and the earthquake reshaped the coastline in ways that are still working themselves out. But where there was devastation, there is now life. Where there were empty shells on bare rock, there are pāua growing toward adulthood.

It is proof, quietly and concretely, that pāua reseeding works.

Passion without evidence is not enough. From early in the programme, Arapawa has worked alongside researchers — including scientists from the Cawthron Institute, one of New Zealand's leading marine research organisations — to measure what the reseeding is actually achieving.

Using careful transect surveys, the team has tracked survival rates and growth patterns in reseeded areas over time. The data shows that roughly 30% of released juveniles survive to harvestable size — a figure that, set against the one-in-20-million odds of wild survival, represents an extraordinary improvement in the species' chances.

Arapawa Blue Pearls is the only pāua farm in New Zealand currently undertaking intensive reseeding. Others have tried. Many have found the demands — fresh, cool water around the clock, four to five hours of daily care, the infrastructure required to maintain a living nursery — too great to sustain alongside a commercial operation.

The Radons have not found it easy. But they have found it necessary. And they have found, over time, that the two things — the commercial farm and the conservation programme — are not competing priorities. They are the same priority, expressed in different ways.

There is a direct line between a pāua pearl purchased and a juvenile pāua released into the wild.

The revenue generated by Arapawa's jewellery collection funds the nursery operations that make sustainable pāua farming possible. The Givealittle campaign that supports the reseeding work breaks this down simply: $20 feeds 100 baby pāua for a week. $50 covers equipment for 24-hour monitoring. $100 provides materials for a new nursery tank section. $1,000 returns 1,000 juvenile pāua to the wild.

When Shiree Chipp received her handcrafted sterling silver pāua shell and blue pearl piece as an anniversary gift, she described how staying on the island and learning the stories behind the jewellery made it more meaningful than anything she had ever owned. That meaning is not incidental. It is structural — built into every piece by the conservation mission that the purchase helps sustain.

The jewellery and the reseeding are not separate things. Every piece in the Arapawa collection carries both.