Why abalone is New Zealand's catch of the

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In New Zealand's southern province of Otago, a group of recreational fishermen are about to go on their regular hunt for shellfish.

It is autumn here and they will be diving into waters so cold that full-body wetsuits are needed.

But it is not just any mollusc that they're after. They are looking for a humble sea snail that has become one of the world's most expensive seafood items.

Blackfoot abalone is known here by its indigenous Maori name, paua. It is not the prettiest creature and could easily be mistaken for a rock.

But its unique black flesh and taste has made it a hot commodity, particularly in Asia where it is a prized delicacy.

Locally, a single abalone commands a hefty retail price of about NZ$50 (US$43; £26). In some Asian restaurants, it would set you back more than US$100.

Natural defence

Former All Black Kees Meeuws is now a recreational abalone diver

There are more than 100 species of abalone around the world, but the blackfoot abalone is one of the largest and found only in New Zealand waters.

Apart from their strong suction to rocks, their only other natural defence is camouflage. Strict rules are needed to help protect the species from overfishing.

Click here to download Why abalone is New Zealand's catch of the