6 Mar 2024

Our Changing World: Fixing kina barrens

From Afternoons, 3:35 pm on 6 March 2024
A man wearing a hairnet, apron and thick gloves uses a device to pry open a sea urchin – one among a table full of hundreds of urchins. In the background another man in hairnet, apron and gloves sprays with a hose and two other men in similar attire work with urchins at another workbench.

At Peter Herbert’s kina factory on the Coromandel, Ashley Hine cracks kina open so his colleagues can scoop out the roe. Photo: © Richard Robinson

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The kina are out of control. As many as 40 urchins crowd into a single square metre of rock, devoid of other life.

A kina barren is a symptom of an ecosystem out of balance. Could we eat our way to a solution?

Putting kina on the table

Kina-nomics involves taking starving kina off reefs, fattening them up and selling them to an East Asian market.

But how can the kina be made more consistently tasty? And can economic and conservation goals really align? 

A man wearing a snorkel, mask and flippers dives down to a bare rock and uses an implement to scrape a kina sea urchin off the rock into a mesh bag, that is now full to the brim with kina. About four fish swim around the freediver, with more visible in the soft blue of the ocean in the backgorund.

Todd Herbert collects kina from a barren for Envirostrat, which is collaborating with Ngāti Porou Seafoods, international startup Urchinomics, and commercial fishers from Sea Urchin NZ. Photo: © Richard Robinson

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Photo: NZ On Air

Voice of Tangaroa is a joint production between RNZ’s Our Changing World and New Zealand Geographic.

Reporting for this series is Public Interest Journalism funded through NZ On Air. You can learn more and read the articles for free at www.nzgeo.com/seas