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ZANZIBAR: At about 10 o’clock every morning, women in hijabs and loose long dresses wade through Zanzibar’s turquoise shallow tides to tend their sponge farms — a new lifeline after climate change upended their former work.
Rising ocean temperatures, overfishing and pollution have steadily degraded marine ecosystems around the island, undermining a key source of income for locals in Jambiani village who long depended on farming seaweed.
Instead, they have turned to sponge cultivation under a project set up by Swiss NGO Marine Cultures.
Hot temperatures have killed seaweed and declining fish stocks have driven many fishermen to quit, said project manager Ali Mahmudi.
But sponges — which provide shelter and food for sea creatures — tend to thrive in warmer waters.
They are also lucrative as an organic personal care product, used for skin exfoliation. Depending on size, they can fetch up to $30 each and a single farm can have as many as 1,500 sponges.
From the shore, black sticks can be seen jutting out of the water, holding lines of sponges.
“I was shocked to learn that sponges exist in the ocean,” Nasiri Hassan Hajji, 53, told AFP, recalling when she first learned about the practice more than a decade ago.
The mother-of-four once farmed seaweed, describing the work as labor-intensive with meagre returns.
In 2009, Marine Cultures launched a pilot farm with widowed women in Jambiani to test their potential in the archipelago, where more than a quarter of the 1.9 million population live below the poverty line.
With demand for eco-friendly products on the rise, the market has grown steadily, with the US National Oceanic and Atmospheric Administration estimating the value of the natural sponge market at $20 million in 2020.
“It has changed my life, I have been able to build my own house,” said 53-year-old Shemsa Abbasi Suleiman, smiling with pride.
Many other women have now joined a cooperative to expand the project, but it was not always smooth sailing.
“At first I was afraid of getting into it because I did not know how to swim. Many discouraged me saying the water is too much and I will die,” said Hajji.
Thanks to an NGO program, she learned to swim at the age of 39.

- Sponges restore coral reefs -

As well as making money for locals, sponges are beneficial to the marine environment.
Studies show that a sponge’s skeletal structure aids carbon recycling within coral reef ecosystems, while its porous body naturally filters and purifies seawater.
An estimated 60 percent of the world’s marine ecosystems have been degraded or are being used unsustainably, according to the United Nations, which warns that the “ocean is in deep crisis.”
Sponges are also known to help restore coral reefs, which support 25 percent of marine life and are currently under threat.
“What attracted me to this is the fact that we are not destroying the environment,” said Hajji.
Zanzibar is part of Tanzania, where violent protests broke out on the mainland on election day last month, with sources indicating hundreds — if not thousands — may have been killed.
Two weeks on, the government has yet to give any casualty numbers with the United Nations calling for investigations.