The cultivation of seaweed for the production of carrageenan, a thickener widely used in foods, has been a major source of income for Zanzibari women for more than 20 years. An analysis of the local conditions revealed that the cultivation of seaweed is subject to a sharp decline in production due to increasing occurrences of diseases and pests, and a low world-market price. Consequently, unmarried women with kids are no longer able to make a living from seaweed farming.
When searching for alternative means of income many aspects such as the know-how of the parties involved, eco friendliness, market-opportunities, investment requirements, general acceptance of the method, scalability, and availability of resources need to be considered. Aquaculture of sponges was identified to be a suitable alternative to seaweed farming promising substantially higher incomes.