In Lamu, seaweed farms create livelihoods while restoring marine ecosystems
Fatuma Mohammed wades into the shallows off Kenya’s south coast at dawn, checking ropes strung between wooden stakes. Clumps of red seaweed sway underwater like cultivated gardens. In six weeks, this crop will be harvested, dried, and sold to processors extracting carrageenan, the thickening agent in everything from ice cream to cosmetics. For her work, Mohammed earns between USD 70-115 every six weeks during production seasons. Modest income globally, but meaningful in a region where fishing yields decline and formal employment remains scarce.
This is coastal agriculture’s unglamorous revolution. While tech entrepreneurs chase carbon credits and impact investors court industrial aquaculture, smallholder seaweed farming is quietly rewriting the economics of Kenya’s marine spaces.
The blue economy’s unlikely champion
Seaweed farming generates few headlines compared to renewable energy or electric mobility. Yet this low-tech activity has spread across East Africa’s coastline, from Tanzania’s Zanzibar to Kenya’s Lamu and Kwale counties. The numbers tell a compelling story: Kenya’s seaweed production expanded from virtually nothing (less than 10 tonnes) in 2008 to over 450 tonnes fresh weight by 2017, reaching approximately 1,000 tonnes by 2020. Tanzania produces far more (roughly 103,000 tonnes fresh weight in 2018) but Kenya’s nascent sector offers insights into structuring emerging value chains for equity.
The appeal is threefold. First, startup costs are minimal: roughly KES 20,000-30,000 (USD 150-230) for stakes, ropes, and seedlings. Second, seaweed thrives in shallow intertidal zones unsuitable for other economic activities, creating income without displacing existing fisheries. Third, seaweed farms actively improve marine environments. The plants absorb excess nutrients, reducing coastal eutrophication. They sequester carbon dioxide during photosynthesis. Their submerged canopies provide habitat for juvenile fish, functioning as nurseries that support depleted stocks.
It’s a rare economic alignment: an activity that becomes more valuable as it scales ecologically.
The value chain gap
Beneath the surface, familiar extraction patterns emerge. Kenya’s seaweed farmers sell dried product to middlemen at KES 30-50 per kilogram (USD 0.23-0.39). Those intermediaries export to Asian processors, where final hydrocolloid products generate margins that never reach coastal communities. Carrageenan worth USD 10-15 per kilogram flows to distant processors while farmers earn cents.
This isn’t unique to seaweed. It’s the structural challenge facing Africa’s agricultural sectors: production without processing, exports without value addition. What makes seaweed different is that solutions appear technically feasible. Small-scale processing facilities serving 100 farmers could inject KES 3-4 million (USD 23,000-31,000) annually into local economies by increasing farmgate prices 40-60%.
The constraint isn’t technological. It’s financial. Processing infrastructure requires upfront capital that smallholders cannot access. Patient investors willing to accept 3-5 year returns are scarce. Impact funds seek larger ticket sizes. Commercial banks view seaweed as novel and risky. The result: potential trapped by financing gaps that should be bridgeable.
Gender economics meets climate adaptation
Seaweed farming’s demographic profile is striking: approximately 90% of Kenya’s seaweed farmers are women, many of them excluded from traditional fishing economies where ocean access was culturally restricted. Mohammed herself explains that declining fish catches by men created openings for women to engage in marine-based economic activities, beginning with shells and crafts, then value-added fish processing, eventually leading to seaweed cultivation around 2010.
This participation creates different spending patterns. Research across coastal communities shows women reinvest farming income disproportionately in children’s education, household nutrition, and savings groups. In Kibuyuni village (Kenya’s first model seaweed farm established by Kenya Marine and Fisheries Research Institute in 2008) farmers consistently report using earnings for school fees, home improvements, and household assets. Tima Jasho, a mother of seven from Kibuyuni’s Seaweed Farmers’ Cooperative employing over 100 households, notes: “If you grow seaweed, you don’t have to depend on a man. I can earn my own money.”
Climate resilience adds another dimension. As ocean temperatures rise and fish migrations shift, coastal communities dependent on capture fisheries face mounting uncertainty. Seaweed farming offers diversification, though it faces its own climate challenges. In 2022, warm currents from Tanzania destroyed much of Kenya’s seaweed crop, forcing farmers to rebuild with new seeds and adapt practices by moving farms to deeper, calmer waters where temperature fluctuations are less extreme.
The ecosystem restoration dividend
Most conservation initiatives ask communities to sacrifice economic activity for environmental gain. Seaweed farming inverts this equation: the economic activity is the environmental intervention.
Studies from Tanzania and Indonesia document measurable marine restoration outcomes. Seaweed canopies reduce water column nutrient loads by 15-25%, mitigating algal blooms that suffocate coral reefs. Research suggests seaweed grows up to two feet per day, absorbing large amounts of carbon dioxide during photosynthesis. More tangibly for fishing communities, seaweed farms attract juvenile fish. Bakari Usi, a youth from Kibuyuni, observes that seaweed farming areas show noticeably higher fish concentrations compared to other Shimoni locations.
Mohammed confirms this pattern: “The places where we do seaweed farming normally attract a lot of fish and this helps fishermen because they don’t go to the deep sea to catch fish hence it also protects the sea floor.”
Scaling without extraction
As Kenya’s seaweed sector gains visibility, larger players are circling. Industrial aquaculture firms see opportunity. Foreign processors eye direct sourcing that bypasses local intermediaries. The challenge for policymakers is ensuring scale doesn’t replicate extractive patterns.
Kenya established a Blue Economy ministry in late 2022 and launched the Kenya National Blue Economy Strategy 2023-2027. Government support includes mapping the coastline to identify suitable seaweed farming zones, funding infrastructure development, training farmers on entrepreneurial skills and value addition, and developing conservation policies.
But rhetoric requires regulatory substance. Specific measures matter:
Transparent Market Access: Establish minimum farmgate prices indexed to export values. Create trading platforms reducing information asymmetries between farmers and buyers.
Community Processing Infrastructure: Direct blue economy financing toward community-owned facilities. The Kenya Bureau of Standards already certifies locally manufactured seaweed products, creating precedent for quality standards.
Marine Tenure Security: Formalise marine farming rights through clear licensing frameworks. Current production occurs across 20 coastal villages, from Kibuyuni to Mkwiro, Wasini, Funzi, and Gazi.
Research Investment: Fund agronomic research tailored to Kenyan conditions. KMFRI has capacity; it needs resources. Current challenges include warm water temperatures making shallow farming susceptible to disease and low yields.
Value Chain Development: Support cottage industries producing seaweed soap, shampoo, lotions, and other value-added products. Kibuyuni farmers already manufacture these products, demonstrating market demand exists.
These are not revolutionary proposals. They are basic value chain development applied to marine contexts. The question is whether Kenya’s blue economy momentum can translate into implementation before investor pressure pushes toward extractive models.
The global market context
The global commercial seaweed market was valued at approximately USD 60.5 billion in 2023, with projections reaching USD 22.8 billion for seaweed food applications alone by 2034. The seaweed hydrocolloids market (the segment most relevant to Kenyan farmers) was valued at USD 2.6 billion in 2024, projected to reach USD 4.8 billion by 2033.
Asian producers dominate. China accounts for 57-60% of global seaweed production. Africa produces only about 120,000 tonnes (fresh weight) annually, with Tanzania’s 92% share dwarfing other countries. Kenya represents less than 1% of African production, which itself accounts for under 3% globally.
This could be read as marginality. Or as opportunity, if African producers position themselves in higher-value segments before market structures ossify. The coffee parallel is instructive: Ethiopia produces exceptional beans but captures only 5% of global coffee market value. Roasting, branding, and retail (performed elsewhere) capture the premium.
Seaweed farming is early enough in Kenya that these mistakes are avoidable. Kenya’s question is whether local farmers and processors can capture fair shares, or whether value will again flow to distant processors and brand owners.
Implementation Partners
Multiple actors are testing models. The EU-funded Go Blue Programme (2021-2024, €24 million investment) specifically targets seaweed value chain strengthening as income for coastal women. The World Bank-funded Kenya Coastal Development Project (2012-2017) revolutionised seaweed farming through training, infrastructure, and a cottage processing factory enabling value-added products.
Mawimbi Ocean Innovations pilots “Seaweed Farm as a Service” in Lamu and Tanzania’s Tanga, providing farmers with equipment rental, maintenance, training, and guaranteed purchase agreements. The Catchgreen project is piloting biodegradable fishing nets and seaweed farming ropes, addressing both plastic pollution and climate adaptation needs.
Conclusion: The tide’s direction
Back in Kibuyuni, farming continues. Mohammed tends her underwater crop, selling to available buyers because alternatives remain limited. She farms because it provides income her mother’s generation couldn’t access. Kenya’s seaweed production expanded from under 10 tonnes in 2008 to approximately 100 tonnes worth over USD 30,000 in 2022, with exports reaching China, France, and the United States. Kibuyuni village alone increased revenue from USD 2,000 in 2012 to over USD 11,000 more recently.
The sector works. The question is whether Kenya’s institutions work well enough to scale it equitably. If policymakers and investors resist premature industrialization, if financing reaches community processing, if marine tenure gets formalized, this unglamorous sector might demonstrate how coastal economies can grow without self-destruction.
The global seaweed market will reach USD 22.8 billion by 2034 with or without Kenya. The question isn’t whether to participate. It’s whether Kenyan coastal communities will participate as price-takers selling raw materials, or as value-creators capturing processing margins and building enduring enterprises.
The answer will be written in policies yet to be drafted and investments yet to be deployed. Meanwhile, the tide rises, the tide falls, and women like Fatuma Mohammed keep farming. Whether Kenya captures the value it creates: that story is still being written.
By Our Reporter
