Madagascar, renowned for its unique wildlife and vanilla production, has a new claim to fame - the island nation is Africa's first and only source of caviar.
The business is an unlikely project in a country beset by grinding poverty, but its owners are determined that luxury foods can play a part in improving Madagascar's economy.
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Workers of the Rova Caviar Madagascar company pull the nets, at the Acipenser factory. (Photo: Mamyreal, AFP)
"A lot of people laughed at us," says Delphyne Dabezies, the head of Rova Caviar, admitting that the enterprise was a big gamble.
"But we took the time to prove that this is serious. Madagascar caviar is now the only caviar produced in Africa and the Indian Ocean."
The island off the coast of Mozambique is still only a minor player in terms of global production, which is dominated by China, Italy and France - though producers in the Caspian Sea still boast the most prized caviar, from Beluga sturgeon.
Last year Mozambique produced a tonne of caviar in a world market of about 340 tonnes a year.
But its ambitious promoters hope to soon increase production to five tonnes.
The unusual plan is the brainchild of Dabezies, her husband Christophe and their partner Alexandre Guerrier - all of them French entrepreneurs based in Madagascar.
A sturgeon is pictured in a net. (Photo: Mamyreal, AFP)
"At the time, our business in luxury ready-to-wear clothes had become sustainable, and we were seeking to diversify our activities," Dabezies said.
"We are all gourmands, so this idea served our purposes.
"Madagascar has an exceptional environment that produces rare crops such as cocoa, vanilla, organic shrimp and lychees -- we thought we could add caviar."
The sturgeon that produce unfertilised caviar roe are kept in Lake Mantasoa, perched at an altitude of 1,400 metres (46,000 feet) east of the capital Antananarivo.
Training the staff has been a major part of the project.
"Caviar professionals have come from abroad," said Ianja Rajaobelina, now assistant director of the production plant, which employs 300 people.
"I had to learn everything on the job."
Staff member Say Sahemsa, wearing white boots, tells AFP: "You have to take care of the spawn and avoid giving them too much or not enough food, to have the lowest possible mortality rate."
Sturgeon are imported from Russia in the form of fertilised eggs, which hatch in a special nursery facility in Mantasoa.
When they reach seven grams (a quarter of an ounce), they are moved to freshwater ponds, and then into large cages in the lake when they weigh 500 grams (around a pound).
At 1.5 kilogrammes, the males are killed and only the females are kept on until their eggs are ready.
Workers from the company Rova Caviar Madagascar grade and analyse the caviar extracted from a sturgeon. (Photo: Mamyreal, AFP)
Colour, taste and smell
The process demands patience and skill.
The first imported eggs arrived in Mantasoa in 2013, and the first grams of caviar did not go on sale until June 26, 2017, Madagascar's independence day.
The quality of the harvest depends on the dexterity of one man, 23-year-old Gaston Soavan'i Thomas.
Knife in hand, Thomas has no margin for error as he extracts eggs from the entrails of each sturgeon.
"At first, I was afraid to destroy or contaminate the eggs, but now everything comes automatically," he said.
The eggs are kept in a refrigerated room at 0 degrees Celsius (32 degrees Fahrenheit).
Expert taster Georges Heriniaina Andrianjatovo taps each box with a small hammer to detect any air bubbles, which are removed as soon as possible. Colour, taste and smell are all important.
"A good caviar rolls in the mouth and exudes an odour of fresh butter," he says.
Once it is judged up to standard, the precious output is sold to high-end shops and restaurants on the island and to its neighbours of Mauritius, Seychelles and Reunion.
Its price is a relative bargain - 100 euros (about R1 582 at R15,83/Euro) per 100 grams - far cheaper than in Europe.
According to Guinness World Records, a kilogramme of the costliest caviar from albino sturgeon off the coast of Iran regularly fetches over $25 000 (about R350 785) about.
Last year Rova Caviar's stock sold out in just a few weeks.
Among those impressed is prominent Madagascan chef Lalaina Ravelomanana.
"I prefer to serve it in its natural state, with salmon or oysters on ice," he says.