60 MARCH 2026 • WORLD AQUACULTURE • WWW.WAS.ORG metrics for water use per unit of tilapia production—derived from Table 1—have been applied and translated from metric tonnes (MT) to millions of pounds (m lbs) for clarity and relevance. Using RAS, which consumes approximately 44.1 US gallons per pound of tilapia produced (368 m³/tonne), the projected annual output from just 1% of irrigation volumes reaches 1.94 million pounds (881,536 tonnes) of tilapia. In contrast, BFT systems — requiring only 18 US gallons per pound (150 m³/tonne) — could yield up to 4.8 million pounds (2.1 million tonnes) annually under the same water allocation. As demonstrated in Table 2, these figures underscore the immense production potential of IAAS when embedded into cropland irrigation systems. By leveraging sequential water use under zerodischarge conditions, IAAS not only enhances water productivity but also positions aquaculture as a scalable, climate-resilient solution to food and seafood security in both water-scarce and water constrained regions. Soil as a Climate Solution: Unlocking the Carbon Sink Beneath Our Feet Soils represent one of the planet’s most potent yet underutilized carbon sinks, storing approximately 2,400 gigatons (Gt) of carbon globally to a depth of 2 meters—two to three times more than the atmosphere itself (Batjes, 1996). This immense reservoir positions soil at the heart of climate mitigation strategies, particularly within agricultural landscapes. Global croplands alone hold the potential to sequester between 29–65 Gt of carbon through regenerative practices, a volume equivalent to three to seven years of global emissions and capable of offsetting up to 35% of agriculture’s historical carbon debt (Aroura Soil Security Think Tank, 2025). The “4 per mille” initiative underscores this potential, demonstrating that even a 0.4% annual increase in SOC could counterbalance fossil fuel–driven CO2 growth (Minasny et al., 2017). Improving soil health is not only feasible — it is imperative. Enhanced soil organic matter improves carbon stability, microbial diversity, and water retention, while simultaneously enabling soils to absorb up to 27% of the carbon required to limit global warming below 2 °C (Aroura Soil Security Think Tank, 2025). Transitioning to regenerative agriculture practices — such as reduced tillage, cover cropping, and organic nutrient cycling including livestock and fish liquid and solid wastes — further reduces emissions both directly (by minimizing soil disturbance) and indirectly (by decreasing reliance on synthetic fertilizers). This positions soil restoration as a practical, scalable pathway toward net-zero emissions and a nature-positive food system. This vision was formally elevated at COP30 in Belém, where soil health was placed at the center of global climate action. The launch of RAIZ (Resilient Agriculture Investment for NetZero Land Degradation) marked a pivotal moment, promoting regenerative agriculture, carbon sequestration, and blended finance mechanisms to restore degraded farmland (COP30 Official News Release, 2025; FAO – RAIZ at COP30, 2025). RAIZ is framed as a multi-benefit initiative, delivering outcomes across climate mitigation, biodiversity protection, food security, and desertification prevention. Within this framework, IAAS offer a powerful and practical solution to SOM loading. By restoring soil carbon levels and reducing dependence on off-farm nutrient inputs, IAAS streamlines the transition to regenerative farming — bridging aquaculture and agriculture to deliver climate resilience, food security, and ecosystem restoration in tandem. Perspectives The broader implications of IAAS adoption are significant. Farmers benefit from reduced fertilizer costs, communities gain access to affordable protein, and agroecosystems achieve greater resilience under climate stress. By producing both fish and crops from the same water supply, IAAS embodies the principle of “more crop per drop” (Ahmed et al., 2014). Furthermore, IAAS advances progress across all 17 UN Sustainable Development Goals (SDGs) (Troell et al., 2023), from hunger elimination (SDG 2) and health promotion (SDG 3) to climate action (SDG 13) and biodiversity protection (SDG 15). In the US context, widespread adoption of IAAS in six southern states could offset billions in seafood imports, strengthen domestic food security, and accelerate the transition toward regenerative agriculture. The burden of permitting compliance — widely recognized as a critical bottleneck to aquaculture industry growth in the US (Engle et al., 2020; Hurley et al., 2024) — must be urgently addressed by policymakers to unlock the transition from chemically intensive farming to biologically integrated systems. Streamlining these regulatory hurdles is essential to enable zerodischarge aquaculture models that support nutrient circularity, soil restoration, and regenerative agriculture to scale. IAAS represent a holistic and transformative approach to food production. By simultaneously bolstering seafood security, restoring soil health, and mitigating climate change, IAAS offer a triplewin solution. With vast irrigation volumes available in the southern US, even modest adoption of IAAS could reshape food systems, reduce trade deficits and provide a seafood secure future. IAAS represent a holistic and transformative approach to food production. By simultaneously bolstering seafood security, restoring soil health, and mitigating climate change, IAAS offer a triple win solution. With vast irrigation volumes available in the southern US, even modest adoption of IAAS could reshape food systems, reduce trade deficits and provide a seafood secure future. Policymakers hold the key to removing one of the most persistent barriers to aquaculture expansion in the US: complex and often prohibitive permitting requirements. Easing this regulatory burden is vital to facilitate the shift from synthetic fertilizer dependency to biologically integrated, zero-discharge farming systems like IAAS—thereby accelerating the adoption of regenerative agriculture and climate-resilient food production.
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