Saldanha Bay’s cold, nutrient-rich waters from the Benguela Current create one of the best spots in South Africa for growing mussels. The bay’s sheltered deep harbour and steady upwelling bring plenty of phytoplankton—the tiny plants that mussels filter and eat—making it ideal for aquaculture. Mussel farming here is mostly rope-grown, a low-impact method that turns the ocean into a vertical farm.
The process starts naturally. Two main species grow in the bay: the indigenous black mussel (Choromytilus meridionalis) and the introduced Mediterranean mussel (Mytilus galloprovincialis). Larvae drift in the water until they find a hard surface to settle on. Farmers provide that surface with long vertical ropes hung from floating longlines or rafts, positioned 1–4 km offshore in the Saldanha Bay Aquaculture Development Zone (ADZ). No artificial feed is needed—the mussels simply filter the clean seawater for food.
Once settled, the mussels grow untouched for about 7–8 months. Growth is rapid thanks to the nutrient-rich currents. Ropes are often seeded with small mussels or left for natural settlement. Pegs or stoppers placed every 50 cm help keep the crop in place. When ready, workers reel in the heavy ropes, harvest the mature mussels, and can reuse the system sustainably. Farms harvest daily in season to deliver the freshest product possible.
Rope-grown mussels stay grit- and sand-free because they hang above the seabed. This results in plump, clean shellfish prized for their sweet taste and quality. Companies like Blue Ocean Mussels and Atlantic Royal operate large farms here, with some producing around 10 tons per day during peak harvest. The industry contributes roughly half of South Africa’s marine aquaculture output and supports hundreds of local jobs—from farm workers to processing staff in nearby Velddrif.
Sustainability is a strong point. The method has limited impact on the wider marine environment compared to bottom-trawling or intensive fed aquaculture. Mussels act as “organic extractors,” removing nitrogen and improving water quality by filtering phytoplankton. Ecological models show the bay can support significantly higher production—potentially thousands more tonnes annually—without collapsing the ecosystem, though careful management prevents overstocking that could deplete local plankton.
Challenges exist. Biofouling organisms (like tunicates or invasive species) can settle on ropes and compete with mussels, requiring cleaning. There are monitoring programmes for biotoxins, bacteria (such as E. coli), and trace metals to ensure food safety. The industry works with government and partners like the Marine Stewardship Council’s Fish for Good project to track seabed impacts, protect endangered species, and improve practices.
Economically, mussel farming has helped the area, especially after job losses from industries like steel. It offers steady employment and has potential for growth, with studies suggesting the allocated farming area could produce 10–28 times current levels, creating more jobs and supporting food security.
Visitors to Saldanha often enjoy the results—fresh mussels served at local restaurants or bought live from farms. The operation blends seamlessly with the bay’s natural beauty: rafts dot the water while seabirds wheel overhead. It’s a quiet success story of how smart, nature-based farming can feed people, create livelihoods, and work in harmony with one of South Africa’s most productive marine environments.
Mussel farming in Saldanha Bay proves that with clean water and careful stewardship, the ocean can keep giving—year after year, rope after rope.
