Seaweed yields up by 56%, farmer profits by 18%—the eco-smart aquaculture method reshaping India’s coastal economy, reported by Saurabh Shukla for Krishi Jagran News.
IMTA: The Eco-Friendly Aquaculture Revolution Boosting Yields and Incomes
As the global demand for sustainable seafood and ocean-friendly farming grows, Integrated Multi-Trophic Aquaculture (IMTA) is emerging as a game-changer. This innovative method—blending seaweed and fish cultivation—offers a win-win for both the environment and coastal communities.
According to Saurabh Shukla of Krishi Jagran News, farmers using IMTA have seen seaweed yields rise by 56% and profits increase by 18%, proving that sustainability can be synonymous with profitability.
What Is IMTA?
IMTA is a nature-inspired aquaculture technique where species from different levels of the food chain—like fish, seaweed, and shellfish—are cultivated together in a shared marine space. Fish waste, typically a pollutant in traditional aquaculture, becomes a valuable nutrient for seaweed and filter feeders such as mussels. The result? Cleaner water, reduced environmental impact, and healthier, more productive ecosystems.
This method not only mimics the nutrient recycling found in natural ecosystems but also enhances overall productivity and resource efficiency.
India’s Success with IMTA
In India, the Central Marine Fisheries Research Institute (CMFRI) has successfully demonstrated the IMTA model by integrating seaweed farming with cage culture of cobia, a high-value fish species. The results have been remarkable, offering both environmental and economic benefits to coastal communities.
Key Benefits of IMTA
1. Increased Seaweed Yields
Under IMTA systems, seaweed yields can reach 390 kg per raft—a 56% jump compared to the 250 kg typically produced using traditional methods. This enhanced output translates to stronger market potential and reduced pressure on natural seaweed beds.
2. Faster, More Efficient Growth
IMTA accelerates the seaweed growth cycle. Just 1 kg of planting material can yield 6.4 kg of harvest in 45 days, compared to only 4.1 kg in non-IMTA setups. This faster turnover allows farmers to scale up operations and respond more effectively to demand.
3. Cleaner, Healthier Oceans
By recycling nutrients, IMTA helps reduce eutrophication—a major cause of ocean "dead zones." Seaweeds absorb excess nutrients, while shellfish filter organic particles, leading to significantly improved water quality.
4. Higher Incomes for Farmers
It’s not just good for the planet—IMTA boosts the bottom line. Farmers report an 18% increase in net income per cycle, amounting to an average of Rs 86,016 in additional earnings. This dual farming system also makes efficient use of space, labor, and infrastructure.
5. Economic Resilience
By cultivating multiple species, farmers can hedge against market fluctuations. If demand or prices for one crop fall, income from others can help cushion the impact—providing stability and resilience to farming operations.
The Future of Sustainable Aquaculture
Integrated Multi-Trophic Aquaculture isn’t just a buzzword—it’s a powerful model for the future of seafood production. It aligns economic goals with environmental responsibility, offering scalable, science-backed solutions for more resilient marine ecosystems.
As more countries—and coastal farmers in India—embrace IMTA, this approach is poised to become a cornerstone of sustainable aquaculture worldwide.
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