Blended Finance in Sustainable Mariculture
Blended Finance in the Blue Economy and a Partnership Model for Marine Aquaculture
Marine aquaculture has reached a point where it can no longer be viewed merely as a production activity alongside traditional fisheries. Growing global demand for protein, pressure on natural stocks, limitations on land-based resources, and environmental sensitivities have turned this field into part of the broader conversation around food security and the blue economy. When food production from the sea moves into industrial scale, the core issue is not only building cages and securing juvenile fish; the more important question is what type of capital is willing to accept biological risk, regulatory risk, feed costs, the payback period, and sustainability requirements at the same time.
Private investors usually enter projects whose cash flow is predictable, collateral is clear, and exit path is defensible. Marine aquaculture in many countries does not easily present such a picture, because production takes place in an open environment and depends on water quality, biological health, feed supply, cold-chain infrastructure, marine zoning permits, and market access. For this reason, a partnership model between the government, banks, and private investors only becomes meaningful when each party accepts part of the risk and the financial instrument distributes that risk across manageable layers instead of imposing it on a single actor.
Blended finance here is not a decorative term used to attract capital; it is the financial architecture of the project. The government enters through licensing, zoning, environmental data, infrastructure, and partial coverage of regulatory risk. The bank takes on a financial and disciplinary role through senior debt, a credit line, or working capital. The private investor contributes equity, operational expertise, and commercial risk-taking. This combination is defensible only when environmental sustainability, production standards, supply-chain traceability, and repayment logic are connected to the financial contract from the outset.
How Does Blended Finance Make Marine Aquaculture Risk Investable?
The operational definition of blended finance is based on the use of catalytic public, development, or philanthropic capital to increase private-sector investment in sustainable development. According to Convergence’s global database, the recorded market for this type of finance, as of the 2024 report, included 1,123 transactions with a total investment volume of $213 billion. This figure does not represent the size of the aquaculture market, but it does show that blended finance instruments have moved beyond development literature and entered the operational language of capital markets, development banks, and infrastructure projects.
– Convergence, the global specialized platform for blended finance: “Blended finance means using catalytic public or philanthropic capital to increase sustainable private investment.”
The logic of this definition is clear in marine aquaculture. A project that is difficult for banks because of the lack of traditional collateral, a long payback horizon, disease risk, fluctuations in feed costs, or uncertainty in export markets can become more bankable through a layer of catalytic capital. First-loss capital, concessional loans, credit guarantees, political risk insurance, and technical assistance each fill part of the gap between the project’s actual risk and the level of risk investors are willing to accept. In this structure, public capital does not replace private capital; rather, it opens the way for private capital by enabling more accurate risk pricing.
– Senior leaders of the World Bank Group, the International Finance Corporation, and the Multilateral Investment Guarantee Agency: “The risk-return ratio for investment in emerging economies is still not sufficient.”
This statement has direct relevance for marine aquaculture in emerging economies, because the main problem is often not the absence of production opportunities, but the absence of a reliable financial structure that can turn those opportunities into investable projects. If the government only issues permits without providing zoning data, environmental monitoring, coastal infrastructure, and a sustainability framework, the bank will still face a highly ambiguous project. If the bank only provides short-term loans without understanding the biological production cycle, feed costs, and working capital needs, repayment pressure can weaken the project during the growth phase. If the private investor also enters without a commitment to standards and risk disclosure, the project may move away from a sustainable blue economy toward costly and vulnerable development.
Global Aquaculture Growth and the Capital Needs of a Sustainable Blue Economy
FAO data for 2022 show that global fisheries and aquaculture production reached 223.2 million tonnes. Of this amount, aquaculture production accounted for 130.9 million tonnes, while farmed aquatic animal production reached 94.4 million tonnes. For the first time, farmed aquatic animal production surpassed capture fisheries and accounted for 51 percent of aquatic animal production. This milestone shows that the future supply of aquatic foods no longer depends solely on capture capacity, and that controlled, standardizable, and capital-intensive farming has moved closer to the center of the global food chain.
– Manuel Barange, Assistant Director-General of the Food and Agriculture Organization of the United Nations: “Aquaculture has been the fastest-growing food production system in the world over the past five decades.”
Despite this growth, global aquaculture production remains highly concentrated. The ten countries of China, Indonesia, India, Vietnam, Bangladesh, the Philippines, South Korea, Norway, Egypt, and Chile account for nearly 90 percent of global aquaculture production. This concentration carries two messages for countries seeking to enter the marine production chain. On the one hand, the global market and operational knowledge have reached a mature stage. On the other hand, entry by new players will be difficult without reducing investment risk, building institutional capacity, standardizing operations, and developing markets.
A 2025 World Bank and WWF report estimates the investment opportunity in sustainable aquaculture through 2050 at $1.5 trillion and presents it as a pathway to creating up to 22 million new jobs. Under the business-as-usual scenario, $0.5 trillion in investment with 1.9 percent growth could increase production to 159 million metric tons by 2050 and create 8 to 14 million jobs. Under the ambitious scenario, $1.5 trillion in investment targets 255 million metric tons of production and 13 to 22 million jobs. These figures should not be directly generalized to any specific country, but as a global benchmark they show that sustainable aquaculture requires long-term investment, specialized financial systems, and precise public policy.
– Genevieve Connors, Acting Global Director for Environment at the World Bank: “To realize the full potential of aquaculture, we need to move toward production that is efficient, responsible, inclusive, and economically viable.”
Feed Costs and Biological Risk in the Design of Blue Loans and Credit Guarantees
In the financial model of marine aquaculture, feed is not merely a cost line; it is the core of the project’s operational risk. FAO and World Bank sources generally report feed as accounting for 50 to 70 percent of production costs, or up to 70 percent of operating costs. When such a large share of costs depends on a single input, fluctuations in feed prices, import disruptions, quality deterioration, or changes in the feed conversion ratio can put pressure on loan repayment capacity. For this reason, a working capital credit line for feed, a stable supply contract, and feed-efficiency monitoring can have a more direct impact than an unconditional public subsidy.
The FCR, or feed conversion ratio, measures the ratio of the mass of feed consumed to the mass of weight gain or harvestable production. According to Table Debates, the general FCR range for farmed aquatic species is between 1.0 and 2.4, but this figure must be interpreted in light of species, production system, feed quality, and site conditions. From a financial perspective, a lower FCR means better feed efficiency and less pressure on operating costs. From the bank’s perspective, this same indicator can become one of the project’s performance-monitoring variables, because weak feed efficiency quickly appears in cash flow.
Biological risk is also an inseparable part of marine projects. Disease, parasites, reduced dissolved oxygen, algal blooms, storms, management errors, and environmental damage can disrupt production and loan repayment. FAO and Reuters sources emphasize that controlling environmental damage, disease, and invasive species depends on proper regulation and monitoring. Therefore, production insurance, water-quality monitoring, aquatic animal health requirements, and a biological incident response plan should not be designed after financing is secured; they should be tied from the beginning to loan disbursement conditions and guarantee renewal.
IFC Standards and Turning Aquaculture Sustainability into a Financial Condition
One of the challenges of the blue economy is that not every marine project is necessarily sustainable. IFC’s Blue Finance Guidelines consider investment in aquaculture eligible when it is made to achieve, maintain, or exceed the Aquaculture Stewardship Council standard or an equivalent standard. This criterion creates an important boundary between credible blue finance and superficial labeling. In a government-bank-private investor model, such a standard can shift from an environmental recommendation to a financial covenant.
Turning a standard into a financial condition means the bank should not look only at collateral and interest rates; it should also incorporate the path to obtaining or maintaining sustainability certification, supply-chain traceability, and operational quality into the loan agreement. In its guidelines, IFC considers traceability systems important for ensuring the sustainability of seafood operations, facilities, and supply chains. In export-oriented projects, this traceability is not merely an ethical requirement; it is part of market access and commercial risk management. If the product cannot be traced from cage to processing, cold storage, and transport, blue capital and standards-sensitive markets will assign a higher risk to the project.
Marine spatial planning is also a complement to financial standards. In marine projects, site selection must reduce conflicts with fisheries, conservation, transportation, tourism, and sensitive habitats. The TASFAM experience in Tanzania, supported by PROBLUE, shows that marine spatial planning for fisheries, aquaculture, and conservation is a tool for reducing conflicts among different uses. For the financial model, this means reducing licensing risk, lowering the probability of project suspension, and increasing defensibility before banks and investors.
Thailand Case Study and the Role of Blue Loans in the Farmed Shrimp Value Chain
The ADB and Thai Union case in Thailand shows how a blue loan can be directly connected to the aquaculture value chain. In 2025, the Asian Development Bank and Thai Union signed a $150 million blue loan for the sustainable farmed shrimp value chain in Thailand. ADB described this as the first blue loan for sustainable aquaculture in Thailand. The significance of this example is that a development bank provides a thematic loan tied to sustainability rather than a grant, and uses its credibility to reduce private investment risk across the value chain.
– Thiraphong Chansiri, CEO of Thai Union Group: “Sustainability is at the heart of our business, and this blue loan is an important step on our journey.”
This case study carries a structural message for countries seeking to develop marine aquaculture. A blue loan becomes meaningful when it looks at the entire chain, not only the farming site. In the shrimp or marine fish value chain, production, feed, aquatic animal health, processing, cold chain, traceability, and sales markets are interconnected. If financing covers only the cost of building the farming unit but ignores feed risk, processing, or export standards, the project may begin technically but remain financially vulnerable to operational shocks.
The AquaInvest Platform case explains the same logic from the angle of project preparation. This platform, with the involvement of the World Bank and PROBLUE, is designed to examine sustainable economic growth in the aquaculture value chain and improve profitability, marketability, and investment readiness. Its main tools are technical assistance, value-chain analysis, project preparation, and making opportunities investable. This stage comes before loans or guarantees, because many projects face a lack of data, operating models, and investment transparency before they face a lack of capital.
World Bank Guarantees and Their Role in the Government-Bank-Investor Model
The World Bank Guarantee Platform was designed in 2024 to expand guarantees to $20 billion by 2030. Its three product families include credit guarantees, political risk insurance, and trade finance guarantees. In fiscal year 2024, the World Bank Group issued approximately $10.3 billion in new guarantees, including $8.2 billion from MIGA, $1.4 billion from IFC, and nearly $700 million from the World Bank. These data show that guarantees in development finance are not merely a marginal instrument, but one of the main pathways for bringing private capital closer to higher-risk projects.
In marine aquaculture, a credit guarantee can cover part of the risk of loan default and make banks more willing to enter a project with nontraditional collateral. Political risk insurance can reduce risks such as regulatory changes, licensing issues, restrictions on currency transfer, or breach of government contract. Trade finance guarantees can also be considered for imports of feed, equipment, feeding systems, or supply-chain components. These instruments function properly only when they are accompanied by real equity contribution, risk disclosure, performance monitoring, and environmental conditions.
The difference between blended finance and PPP becomes important at this point. PPP is a contractual framework for allocating risk and responsibility between the government and the private sector, while blended finance provides the capital layers and financial instruments needed to change the risk-return profile. In marine aquaculture, the two can be used simultaneously. For example, PPP can be appropriate for docks, laboratories, monitoring, cold-chain infrastructure, and suitable zoning, while blended finance can be used for loan guarantees, concessional credit lines, insurance, and first-loss capital.
Iran’s Path to Localizing Blended Finance in Marine Aquaculture
In Iran, the basic legal framework for aquatic resources is based on the Law on the Protection and Exploitation of Aquatic Resources, approved in 1995. This law regards aquatic resources in waters under the country’s sovereignty and jurisdiction as national wealth and places the management of their protection and exploitation within the framework of public regulation. Article 3 of the same law defines the responsibilities of the Iranian Fisheries Organization as including research, propagation, aquaculture, processing, and support for actors in the fisheries and aquatics sector. The 2007 amendment to the executive regulation also defines farmable aquatic species as fish, crustaceans, mollusks, aquatic plants, and other aquatic organisms with economic and farming value.
This legal framework is important for designing the financial model because a marine project is carried out on a resource with a public and sovereign nature. The government’s role in such a model should not be limited to direct ownership of the farm; it should focus on zoning, licensing, environmental data, monitoring, public infrastructure, and sustainability conditions. Banks can define senior debt, feed working capital, and phased guarantees based on technical progress and compliance with standards. Private investors must also bring real equity, operational expertise, biological management, and market responsibility into the model.
– The Government’s Role in Reducing Regulatory Risk and Preparing Marine Zones
For Iran, the most defensible starting point is to build the project through data and licensing, not through the announcement of production capacity. Zoning data, biological capacity, conflicts among uses, environmental monitoring, the licensing pathway, and aquatic animal health requirements must be clarified before financing. When this layer is not prepared, the bank is forced to reflect regulatory and environmental risk in pricing, collateral requirements, or stricter credit conditions. By preparing this layer, the government can reduce the project’s cost of capital without paying a large direct subsidy and can bring in private capital with greater confidence.
– The Bank’s Role in Linking Facilities to Standard Feed and Production Monitoring
In this model, the bank is not merely a provider of credit facilities; it is the guardian of the project’s financial discipline. Given the high share of feed in production costs, it is important to design working capital facilities for feed, align repayment schedules with the growth cycle, and monitor indicators such as FCR, aquatic animal health, and cold-chain quality. If credit facilities are designed without regard to the biological cycle and fluctuations in feed costs, liquidity pressure can reduce the quality of farm management. By contrast, phased lending combined with sustainability covenants and production insurance can control the risks of both the bank and the investor at the same time.
A Practical Conclusion for Turning Iran’s Blue Economy into an Investable Project
The blue economy becomes an investment opportunity when a reliable bridge is built between the biological logic of the sea and the financial logic of the bank. Globally, marine aquaculture has entered a stage in which it plays an increasingly significant role in both food security and development finance. However, successful entry into this field cannot be achieved simply by announcing production targets or allocating marine zones. The project must show how it will secure feed, monitor disease and environmental risk, move toward sustainability standards, and protect its cash flow against operational shocks.
For Iran, the cautious and defensible path is to design a three-layer model. The first layer consists of the government and public institutions that prepare zoning, licensing, infrastructure, environmental data, and the sustainability framework. The second layer consists of banks and financial instruments that enter through credit guarantees, risk insurance, concessional loans, and working capital facilities. The third layer is the private investor, who accepts equity contribution, operational management, commitment to standards, and market responsibility. Such a structure does not eliminate risk, but it transforms risk from an undefined barrier into a set of priceable and monitorable commitments.
Global experience shows that successful blue finance, especially in aquaculture, moves forward with three simultaneous conditions: reliable data, measurable standards, and appropriate financial instruments. If these three conditions are not aligned, a guarantee can turn into a transfer of risk to the government, a loan can create liquidity pressure, and private capital may not move beyond the pilot stage. But if the marine zone, feed, monitoring, standards, traceability, and cold chain are all considered within a single financial model, the blue economy can move from being a natural capacity to becoming an investable, sustainable, and manageable project.
