1. Preface – Scope of this Synthesis:
This synthesis report is drawn from the broader Aquadapt PhilCam initiative, an action research project jointly funded by the International Development Research Centre (IDRC), Canada and the Government of Canada. The broader Aquadapt program is a diverse portfolio of 11 applied, collaborative and results-oriented research projects in Cambodia, Fiji, Indonesia, Kiribati, Malaysia, the Philippines, Thailand, Samoa, the Solomon Islands and Vietnam.
Nature-based solutions in aquaculture have the potential to address the compounding threats of climate change and environmental degradation while delivering livelihood and biodiversity benefits. Yet, more knowledge, policies, and incentives are needed to enable access and adoption, particularly for small- and medium-scale aquafarms.
While the broader initiative has produced comprehensive academic and literature reviews through its consortium partners, this specific report is intentionally distinct in its scope. It focuses strictly on the field-based realities and frontline interventions of the project, specifically the deployment of Nature-based Solutions (NbS). The evidence presented here is drawn directly from grassroots implementation – incorporating baseline household data, qualitative focus group discussions, localized financial tracking, and direct community outcome stories. This document prioritizes ground-level data and human impact over extensive scientific referencing. It serves as a practical, evidence-based record demonstrating how localized economic resilience – driven by initiatives like women-led post-harvest value addition – directly sustains macro-level conservation mandates, such as utilizing science-based protocols to restore 30 hectares of prime coastal mangroves.
2. Executive Summary
Small-scale aquaculture in the Philippines and Cambodia faces an existential threat from climate change. Unpredictable floods and severe heatwaves are destroying traditional single-crop farms. Relying on expensive commercial inputs traps frontline communities in cycles of debt and accelerates environmental degradation. To survive, the sector requires a fundamental paradigm shift. This report demonstrates that true climate resilience is achieved through Nature-based Solutions (NbS) – interventions that secure human livelihoods while actively protecting and restoring vital ecosystems.Financial support for this action research was provided by the Government of Canada’s International Climate Finance Initiative and the International Development Research Centre (IDRC) in Ottawa, Canada.
Across five Action Research Pilot (ARP) sites, local farmers and researchers replaced rigid, high-risk aquaculture with low-cost, adaptive natural systems. Instead of expensive concrete infrastructure and imported feeds, communities adopted low-impact modular tanks, established localized hatcheries to secure their own seed supply, and developed home feed formulations using natural crop residues. These practical shifts drastically reduced daily operational overhead. They transformed vulnerable ponds into self-sustaining ecosystems capable of surviving severe weather anomalies.
Economic stability at the household level is the foundation of long-term climate resilience. To combat the all-or-nothing gamble of single-crop farming, the project prioritized alternative livelihood diversification for the household. A central pillar of this success is women-led post-harvest value addition. By taking charge of processing, drying, and packaging the harvest, women established safe, independent revenue streams. This financial autonomy protects the family from volatile market crashes and eliminates the desperate need to over-exploit natural resources to pay off mounting debts.
These localized successes provide a replicable blueprint for regional scaling. When farmers see their neighbors cutting costs and surviving droughts, they naturally adopt these systems. To guarantee long-term survival, Local Government Units (LGUs) and Commune Councils have begun co-financing decentralized hatcheries and legally protecting coastal zones. Embedding these low-cost practices into official municipal budgets ensures these frontline communities have a permanent structural safety net.
The ultimate conclusion of this field data is a challenge to national policy. The aquaculture sector must stop measuring success strictly by production tonnage and begin valuing zero-debt farming, nature-based climate solutions, and ecological restoration as the foundation of smallholder resilience. When families achieve stable, diversified food security, they transform from vulnerable beneficiaries into active environmental stewards. This localized resilience is the engine that directly sustains macro-level conservation mandates. The project demonstrates that empowered communities are the ultimate guardians of their environment, fully capable of championing ambitious ecological goals, such as utilizing science-based protocols to restore aquatic ecosystems.
3. Introduction: The need for a paradigm shift in Small-Scale Aquaculture
3.1 The Climate Challenge on the frontlines
For small-scale aquaculture farmers in the Philippines and Cambodia, climate change is not a future projection; it is a daily, operational reality. Traditional farming methods are increasingly colliding with extreme, unpredictable weather patterns, turning what used to be reliable livelihoods into highly precarious gambles that threaten the survival of these rural communities.
In the Philippines – across coastal and upland sites like Guinayangan, Ivisan, and Leyte – farmers face a volatile mix of intensifying typhoons and severe dry spells. Storm surges and heavy flooding routinely wash away aquaculture infrastructure and entire fish stocks in a matter of hours. Conversely, during extreme heatwaves, shallow ponds dry up or reach fatal temperatures, causing fish mortality. Because these climate shocks now frequently happen back-to-back, farmers are often trapped in cycles of debt, unable to recover their investments before the next crisis hits.
In Cambodia, communities around Kampong Thom and Koh Kong are witnessing the historic, now increasingly predictable rhythms of the wet and dry seasons fundamentally shift. Erratic rainfall and shifting water levels severely disrupt both inland and coastal farming by upending the seasonal timelines farmers have relied on for generations. During prolonged dry seasons, the severe lack of water for pond aeration leads to sudden, devastating stock losses as stagnant, overheating water rapidly depletes oxygen levels and suffocates entire fish populations. Unpredictable early-monsoon floods are equally destructive, sweeping away harvests just before they can be collected. Under these conditions, standard technical fixes – like commercial feeds or mechanical aeration – become entirely useless when the foundational water supply fails.
These constant climate disasters are pushing traditional single-crop aquaculture to the breaking point. Relying on a single, highly vulnerable asset has become an existential risk – especially for smallholder farmers. To survive, farmers need a resilient economic safety net. By adopting Nature-based Solutions (NbS) – such as short-cycle fisheries, integrated polyculture systems, low-carbon feeding systems or empowering women through post-harvest value addition – communities build a crucial buffer against risks. This deliberate diversification creates a mix of on-farm and off-farm income streams, ensuring that a single ruined harvest no longer destroys a family’s entire livelihood.
These climate disruptions extend far beyond individual ponds, severely impacting shared coastal ecosystems. In coastal areas, traditional practices like gleaning and suspended shellfish cultivation provide essential daily food and income, yet remain highly exposed to storm surges. Securing these shared resources requires an active commitment to macro-level habitat conservation. This is where small-scale livelihood diversification directly supports broader ecological objectives – such as utilizing science-based protocols to actively restore prime mangroves in Koh Kong or implementing citizen science to monitor sanctuaries in Ligpit Bantayan or conserve gleaning areas in Guinayangan. Ultimately, when the broader coastal environment degrades, the foundational resources for smallholder aquaculture collapse with it; explicitly protecting these ecosystems is the ultimate Nature-based Solution.
3.2 The Core Thesis
At the heart of this project’s field operations is a fundamental question about the human and economic impacts of climate adaptation: How do localized, nature-based practices change the daily economic resilience and adaptive capacity of small-scale aquaculture farmers? This synthesis paper attempts to answer that inquiry. Rather than exploring theoretical models, the core thesis of this report is that true sectoral resilience cannot be achieved through capital-intensive hardware-heavy interventions alone; it requires integrating natural ecological systems with active community empowerment.
The traditional aquaculture industry pushes for stronger, more expensive technology – demanding that farmers build concrete tanks, buy mechanical water pumps, or rely on mostly imported commercial fish feeds. For smallholder farmers, this “hardware-first” approach fails. These upgrades require capital that frontline communities lack, rapidly driving them into debt, and they remain physically fragile. A rigid concrete tank requires resources that the farmer may not have, whereas low-impact modular tanks offer adaptive flexibility.
The core thesis of this paper is that true climate adaptation demands a paradigm shift: sustainable aquaculture must prioritize the social and ecological dimensions of farming just as fiercely as technical production. This is sometimes referred to as a high-integrity nature-based approach. To build genuine resilience, the sector must embrace Nature-based Solutions (NbS) – interventions that simultaneously protect vulnerable environments and secure human well-being. This requires shifting away from debt-heavy commercial inputs toward low-cost, localized practices such as integrated polyculture, home feed formulations, and women-led post-harvest value addition. Ultimately, this paper argues that success must be defined by how effectively these restorative models guarantee zero-debt food security, build lasting human resilience, and directly support macro-level conservation mandates.
3.3 Methodological scope and setup
To test this core thesis, this paper draws directly from the real-world experiences of five Action Research Pilot (ARP) sites of the Philippines-Cambodia IDRC project. These sites serve as the frontline testing grounds for true Nature-based Solutions (NbS) – interventions specifically designed to simultaneously secure human livelihoods and actively restore local ecosystems. Representing highly diverse ecological and social challenges, three sites are located in the Philippines (Guinayangan, Ivisan, and Leyte) and two in Cambodia (Kampong Thom and Koh Kong).
We utilized an “action research” approach because controlled laboratory experiments cannot replicate the unpredictable realities of severe climate shocks or the daily financial pressures of a rural household. Instead, researchers and local government units worked directly alongside participating farming households across these geographies. The primary goal of this setup was to demonstrate how restorative, low-cost aquaculture models actually perform in the hands of the people who need them most – including the women farmers driving post-harvest value addition. Crucially, this approach directly tests how decentralized, farm-level resilience can support macro-level conservation mandates, such as utilizing science-based protocols to restore 30 hectares of prime coastal mangroves in Koh Kong.
By focusing strictly on these real-world pilot sites, the approach and this paper capture the genuine successes, practical challenges, and organic adaptations of the farmers. This field-level evidence guides scaling social and ecological interventions. When institutions empower local households, they create self-sustaining economies that actively protect vulnerable coastal landscapes.
4. Baseline realities: Vulnerability and the need for adaptation
4.1 The pre-intervention landscape:
The daily reality for participating households across the ARP sites was defined by severe economic fragility, ecological degradation, and stark nutritional gaps. According to baseline household and focus group data, small-scale aquaculture was largely considered as a high-risk gamble rather than a stable livelihood.
Small-scale farm families operated on the thinnest of economic margins. Average household incomes from aquaculture were starkly low – often recorded at practically zero in highly vulnerable sites like Leyte, Koh Kong, and Kampong Thom, and barely reaching $500 to $600 annually even in the more established ponds of Guinayangan and Ivisan. Because their farming systems lacked ecological diversity and relied on fragile, single-crop models, a single climate shock, such as an early monsoon or a severe drought, could wipe out an entire season’s investment. This routinely plunged households into cycles of debt, with the vast majority of farmers experiencing catastrophic, total-crop losses before the project began. This high-risk model also neglected the surrounding environment, contributing to the degradation of vital coastal habitats such as mangroves in Koh Kong.
This baseline vulnerability directly impacted household income. Paradoxically, despite farming fish, these households faced significant daily food security struggles. The traditional mindset treated aquaculture strictly as a “cash crop.” The harvest was intended entirely for sale to pay off debts or buy basic necessities, rather than for household consumption. Consequently, many of these farming families routinely experienced seasonal food insecurity and lacked nutritional diversity in their daily diets.
The baseline data also revealed a stark gender paradox: while surveyed women had more average fish farming experience (7.8 years compared to 5.0 years for men) and higher educational attainment (52% versus 40% with more than an elementary education), their roles remained largely restricted to basic, unprotected support tasks. A major driver of this inequity was the lack of access to foundational productivity assets. Only 16% of women reported owning critical equipment such as water pumps, compared to 45% of men. This asset gap locked women out of operational decision-making. The absence of infrastructure for post-harvest value addition – a critical pillar of true livelihood diversification – prevented them from translating their superior experience into protected, independent revenue streams.
4.2 The risks of single-crop farming:
The biggest reason these families were so much at risk was their heavy reliance on single-crop farming, or monoculture. Before the project’s interventions, many households dedicated all their resources – pond space, labor, and capital – to raising a single species of fish, often relying heavily on expensive commercial feeds to force a quick harvest.
In a stable environment, this method might yield a high volume of fish – particularly if one has a large, well-fed pond. However, in the unpredictable reality of the frontlines, single-crop farming is essentially an all-or-nothing gamble. When a farmer relies on just one species, they have zero economic insulation against shocks. If a sudden drought depletes the pond water, or an unexpected disease targets that specific fish, 100% of the family’s investment is lost in a matter of days. Baseline quantitative data reveal that before adopting mixed-farming methods, these unbuffered climate events routinely caused staggering production losses – ranging from 80% up to a total 100% loss of the harvest in highly vulnerable areas like Guinayangan, Ivisan, and Leyte. This vulnerability was further compounded by a reliance on low-quality fingerlings, which negated the high potential of having better broodstock in the case of tilapia.
Growing only one type of crop also leaves families defenceless against unpredictable markets. Even if their fish survive the weather, farmers can still lose everything if selling prices drop or if the cost of commercial feed suddenly spikes. Often, just buying that expensive feed consumes their potential profit before the harvest even begins. By placing all their economic eggs in one basket, single-crop farming stripped these households of their resilience, turning every weather anomaly or market shift into a potential financial catastrophe.
4.3 The Tipping Point:
When a farmer loses a harvest to a flood or a drought, they do not just lose the fish; they are left with the mounting debt from the commercial feed and fingerlings – the quality of which was often highly uncertain – that they bought on credit. If the next season brings another climate disaster, that debt doubles. Eventually, the financial hole becomes too deep. Without an economic safety net or an alternative way to extract value from the farm, the most rational choice for a struggling family is to stop farming fish altogether.
5. Field interventions: Nature-based Solutions as the “Proof of Concept”
5.1 Transitioning to integrated and low-impact systems:
The cornerstone of the Nature-based Solutions (NbS) approach across the pilot sites was a deliberate shift away from resource-heavy, high-risk farming. The project chose to integrate low-impact systems that harmonize with local ecosystems. This transition served as the primary proof of concept, demonstrating that true climate resilience requires securing human livelihoods while actively protecting the environment.
In Cambodia, the Koh Kong site demonstrated a shift by introducing sea bass pen culture and climbing perch in low-impact modular tanks. These semi-closed systems are cheaper to establish and manageable during extreme weather anomalies, such as severe floods and heatwaves. Crucially, this farm-level footprint reduction directly complements the site’s macro-level ecological mandate.
In the Philippines, Ivisan farmers transitioned from vulnerable monocropping into brackish water polyculture. Integrating multiple compatible species into a single system creates an ecological balance that naturally maximizes water use and mitigates the risk of total crop failure. For oyster and mussel production, farmers modernized traditional stakes by adopting long-line, raft, and tray shellfish cultures as diversified income sources. These new suspended systems are highly mobile; they can be rapidly secured during severe weather, ensuring the harvest survives violent coastal storms while simultaneously providing a protected platform for women-led post-harvest value addition.
The Kampong Thom site provided a powerful example of utilizing existing ecological assets by establishing communally governed Community Fish Refuges (CFRs). Rather than artificially constructing expensive water-holding facilities to combat severe dry seasons, the project optimized natural floodplains. These refuges act as vital natural sanctuaries. They sustain fish populations through prolonged droughts and naturally restock surrounding rice fields when the rains return – achieving large-scale food security with zero mechanical aeration or structural engineering. Adaptations of the Cambodia approach in the Philippines resulted in establishing pilot conservation areas along rivers and the coastline.
5.2 Resource-efficient and climate-smart technologies
A major driver of the baseline vulnerability was the farmers’ heavy reliance on expensive commercial inputs, particularly factory-produced fish feed and artificial infrastructure to manage extreme temperatures. To break this cycle of debt, the project introduced simple, localized innovations that operate as highly effective, climate-smart alternatives – true Nature-based Solutions (NbS) that protect the environment while securing human livelihoods.
In Kampong Thom, farmers tackled the debilitating cost of commercial feed by adopting Azolla farming, home feed formulations, and vermicomposting. Azolla, a rapidly growing aquatic fern, combined with nutrient-rich worms, provides a high-protein, near-zero-cost food source. By composting on-site and growing their own inputs, farmers created a self-sustaining natural feed cycle that finally broke their dependence on volatile commercial markets. This biological shift drastically reduced daily operational overhead. Crucially, eliminating commercial feeds lowers the nutrient runoff and ecological footprint of the farms, acting as a vital, farm-level complement to macro-scale conservation mandates – such as utilizing science-based protocols to restore 30 hectares of prime coastal mangroves in Koh Kong.
In the Philippines, sites like Ivisan and Guinayangan addressed the climate threat of extreme heatwaves through “VeggieShade” integration in their tilapia hatcheries and grow-out ponds. Rather than investing in expensive mechanical cold storage or commercial shade nets to prevent heat-induced fish mortality, farmers constructed simple trellises over their ponds to grow climbing vines and vegetables. This living canopy serves a brilliant dual purpose: it naturally regulates water temperature below, keeping tilapia safe during severe dry spells, while simultaneously producing a secondary vegetable crop above. This diversified harvest creates a vital new avenue for women-led post-harvest value addition and independent household revenue.
These resource-efficient interventions demonstrate that Nature-based Solutions are not just ecologically sound – they are highly practical economic tools that free farmers from the burden of expensive, industrialized inputs and transform vulnerable ponds into resilient, self-sustaining ecosystems.
5.3 Hatchery development and species diversification
Before the project, a major weakness for these farmers was their heavy reliance on distant commercial hatcheries. Farmers were forced to buy imported, often stressed fingerlings of a single species, highly susceptible to local climate shocks. To build true resilience, the project focused on decentralizing the supply chain through localized, farmer-entrepreneur-managed hatcheries and species diversification. This decentralized supply explicitly supports “short-cycle fisheries.” When severe droughts deplete water sources, farmers can safely pause operations and instantly restart when rains return – a flexible strategy only possible with immediately accessible local seed. By ending reliance on commercial supply chains, this true Nature-based Solution (NbS) actively reduces the regional ecological footprint, perfectly complementing macro-level conservation mandates.
In Leyte, this intervention focused on reviving native species, specifically the native catfish, which is naturally adapted to local weather fluctuations. The rollout demonstrated the inherent flexibility of the NbS approach. When the initial lead farmer experienced a critical setback in the hatchery process, the consortium rapidly adapted rather than forcing a failing technology. With support from the VSU-Tolosa campus, they successfully supplied native catfish fingerlings to two specialized farmers while intelligently pivoting to supply 26 others with viable local species like tilapia. Three other species found in the peatlands are being targeted for conservation. Adapting to ground realities – rather than strictly adhering to rigid top-down plans – is the hallmark of a truly resilient agricultural model.
In Ivisan, a localized tilapia hatchery spearheaded by a local farmer proved transformative for the community’s supply chain. By breeding fish locally, the community ended its reliance on importing expensive fingerlings from distant commercial hubs. The acclimated fish yielded dramatically higher survival rates, and the intervention catalysed an entirely new micro-economy. Quantitative data confirms that a former major expense (buying fingerlings) transformed into a profitable output. This new revenue stream provides the vital independent capital needed to fund women-led post-harvest value addition, further expanding household economic security. This decentralized approach thrives when backed by local governance, as demonstrated by the actively managed LGU nurseries in Guinayangan that ensure a stable, high-quality seed supply.
By diversifying species and localizing hatcheries, these sites successfully insulated themselves against supply chain disruptions and climate-driven diseases, proving that community-managed infrastructure is the foundation of both economic and environmental resilience.
6. The Core Narrative: Social dimensions and human impact
6.1 Farm diversification as a risk-aversion strategy
As established in the baseline data, single-crop farming was a fragile, all-or-nothing gamble. To combat this, the central social transformation across the ARP sites was the adoption of farm diversification. By shifting to integrated agri-aqua systems, the project essentially handed these households a critical economic insurance policy. This approach represents a quintessential Nature-based Solution (NbS): intentionally mixing multiple species of fish with crops or livestock protects ecosystem balance while ensuring a severe climate shock no longer dictates total financial ruin. If a sudden heatwave impacts the tilapia, fruit trees, drought-resistant vegetables or hardy native catfish still provide income and food for the table. This localized stability directly supports broader environmental mandates, proving that zero-debt, food-secure communities are the most effective stewards for macro-level conservation efforts, such as utilizing science-based protocols to restore 30 hectares of prime coastal mangroves.
Outcome stories from the pilot sites perfectly illustrate this human impact. In Ivisan, the experience of Simeon Occeno, a local farmer practicing Integrated Agri-Aqua (IAA), demonstrates how integrating multiple farm elements creates a reliable buffer. By moving away from relying on a single vulnerable harvest, his diversified farm ensures that the family is never left completely exposed to unexpected weather patterns or sudden market crashes.
Focus group discussion (FGD) data clearly reveals, this shift to diversified farming opened an unexpected but highly valuable social door: it naturally increased wider family engagement. Traditional monoculture often relies on heavy, singular bursts of labor. An integrated farm demands multiple, varied daily tasks – such as managing localized hatcheries, feeding smaller secondary fish, or processing harvests. This structural change allowed other family members, particularly women and youth, to safely and actively participate in the farm’s daily operations, transforming the pond from a solitary burden into a shared family enterprise. Crucially, this increased participation paves the way for women-led post-harvest value addition. It establishes safe, independent revenue streams that dramatically elevate the household’s economic power, and it does so harmoniously, without disrupting traditional household structures or challenging established leadership roles.
6.2 Household food and nutritional security
As established in the baseline data, a tragic paradox of the traditional aquaculture model was that despite farming fish, households frequently faced seasonal food insecurity. The pond was treated strictly as a cash-crop machine, meant to be harvested all at once to pay off mounting debts rather than feed the family. The introduction of integrated systems fundamentally broke this cycle. By deploying true Nature-based Solutions (NbS) – where ecological diversity directly secures human well-being – the project ensured a reliable, healthy food supply reaches the household kitchen.
Data from across the pilot sites highlights exactly how this shift occurred. By integrating secondary crops alongside the ponds, such as the diverse vegetables (string beans, eggplant, and cucumber) recorded in Leyte, families created an immediate, daily food source. Because these integrated crops cost practically nothing to grow, they can be consumed directly by the household without the financial penalty of eating into the primary “cash” harvest. Securing this immediate baseline of food relieves the desperation that drives environmental over-exploitation, empowering communities to actively support macro-level conservation mandates.
Qualitative focus group discussions reveal that diversifying the fish species itself fundamentally changed daily consumption habits. When a farmer relies on a single vulnerable species, harvesting early for dinner ruins the final market payout. However, in a resilient polyculture system or a communally managed CFR, farmers can easily harvest smaller, fast-growing fish for daily meals while leaving higher-value species to mature. These small fish and locally gleaned coastal resources, like oysters and mussels, provide a highly concentrated source of essential protein. Crucially, this daily access creates a reliable, continuous inventory for women-led post-harvest value addition, allowing women to transform excess daily catch into dried or processed goods that generate independent household revenue.
This structural shift ensures that the family is the first to benefit from the harvest, effectively helps close the nutritional gaps that affected these frontline communities before the intervention.
6.3 Gender Equality and Social Inclusion (GESI) in practice
As noted in the baseline data, women’s roles in traditional aquaculture were restricted to basic, unprotected support tasks. A major goal of the Nature-based Solutions (NbS) approach was to fundamentally change that dynamic. The objective was not to force women into heavy physical pond labor or abruptly disrupt established household structures. The project successfully lowered barriers to women’s leadership by introducing supplementary, highly profitable roles – such as managing localized hatcheries or driving post-harvest processing – that operate closer to the homestead. Securing independent livelihoods that do not rely on intensive natural resource extraction directly supports macro-level ecological preservation.
One important engine for this transformation is women-led post-harvest value addition. Women were empowered to take over the processing – drying, curing, and packaging the fish – moving away from selling raw harvests at the farm gate for low wholesale prices. Quantitative data firmly backs this shift: project records show women now demonstrate double the capacity for post-harvest value addition compared to men (22% versus 11%), alongside significantly higher capabilities in safe food storage. This shift accomplishes two critical things: it protects women’s labor by moving it into a safer, manageable environment, and it provides them with a distinct, independent income stream over which they exercise direct financial control. Importantly, this role complements rather than competes with men’s labor, securing much-needed additional income for the entire household.
Field data from across the sites perfectly illustrates this success. In Guinayangan, records reveal the women’s value chain directly resulted in the production of dried fish (Guinading) – a highly profitable product generating an entirely new revenue stream non-existent at baseline. In Ivisan, women evolved from informal farm helpers to independent processors taking charge of value addition. While they are currently driving these processing efforts on an individual household basis rather than as a formalized collective enterprise, their growing economic empowerment is undeniable. Focusing on the end of the supply chain ensures that women’s leadership increases overall household profit margins. This achieves genuine social inclusion, establishes zero-debt economic resilience, and equips these communities with the financial stability needed to become active stewards of their surrounding coastal environments.
6.4 Influencing community mindsets
Traditional agricultural development projects often treat frontline communities merely as passive “receivers of aid,” providing standardized guidelines, imported technologies, and commercial feed while expecting strict adherence to top-down systems. Focus group discussions across the ARP sites reveal a growing behavioral shift triggered by the Nature-based Solutions (NbS) approach: farmers have transformed into active co-researchers and proud owners of their ecosystems.
Outcome stories from the field document farmers actively experimenting with these systems rather than blindly accepting them. Whether developing home feed formulations using local crop residues to reduce their ecological footprint, or adapting the native catfish breeding process to local realities after initial setbacks in Leyte, the community took the lead. Crucially, this intellectual ownership extends to women, who utilize this adaptive, entrepreneurial mindset to drive independent post-harvest value addition.
When farmers see their local knowledge producing tangible results – like saving capital on feed or keeping fish alive during a severe heatwave – they stop waiting for external rescue. They transform from vulnerable beneficiaries into confident, resilient innovators who own their agricultural and financial future. By internalizing this proactive, restorative mindset, these empowered communities become the ultimate guardians of their environment, proving fully capable of sustaining ambitious, macro-level ecological mandates, such as utilizing science-based protocols to restore 30 hectares of prime coastal mangroves long after the project concludes.
7. Pathways to scaling and institutional integration
7.1 Horizontal scaling (farmer-to-farmer)
The true test of any agricultural intervention is what happens when the project staff leaves the site. For an idea to scale organically, it cannot rely on constant external funding; it must make immediate, visible economic sense to the community. Across the ARP sites, the transition to Nature-based Solutions demonstrated a powerful “horizontal scaling” effect, where successful practices spread naturally from single pilot ponds to neighboring farmers.
Qualitative reports and focus group data reveal that this farmer-to-farmer spread is driven almost entirely by visible economic proof. When a traditional farmer struggles to buy expensive commercial feed, but looks across the road and sees their neighbor successfully utilizing home feed formulations – mixing local crop residues and coconut – at near-zero cost, the intervention sells itself. The neighboring farmer does not need a formal project workshop to adopt the practice; they simply ask their neighbor for the localized recipe and start mixing their own batch, significantly reducing both their overhead and their carbon footprint.
Similarly, tracking of the localized hatcheries in Ivisan and Leyte shows a distinct multiplier effect. Once the initial pilot farmers demonstrated that a local seed supply enabled short-cycle fisheries – allowing them to safely harvest early or pause operations during a severe dry spell and instantly restock when the water returned – surrounding households began independently shifting away from imported fingerlings. This organic replication proves that when interventions are kept affordable, simple, and locally adaptable, farmers will naturally act as the most effective extension agents for their own communities, scaling the solutions far beyond the original project boundaries.
7.2 The impact of the consortium approach
Building a “Community of Practice”
Historically, institutional support for rural farmers often operated in silos – with research, policy development, and field implementation handled entirely separately. To accelerate climate adaptation and align these efforts with the project’s overarching objectives, the initiative deliberately united these fragmented groups into a single, cohesive “community of practice.”
This consortium approach ensures that alternative livelihood diversification directly supports broader Nature-based Solutions (NbS). A prime example of this alignment is the application of science-based protocols to successfully restore prime mangroves in sites like Koh Kong.
Academic and Action Research Partners (ARPs) in the Field
Local field researchers acted as the bridge on the ground, rapidly identifying community threats and facilitating the grassroots rollout of low-impact systems, such as integrated polyculture. When deeper technical crises hit, the formal academic partners stepped out of the classroom to become real-time problem solvers.
This dynamic was demonstrated across multiple sites:
- Rapid Mobilization in Leyte: When faced with a failing hatchery season, the university partner VSU-Tolosa rapidly mobilized to save the harvest by directly supplying native catfish and tilapia fingerlings to 28 different farmers.
- Translating Expertise into Action: Researchers from CLSU translated their academic expertise into direct field action across multiple ARPs. They provided the community with hands-on training on home feed formulations, conducted rigorous habitat assessments, and supplied high-quality breeders.
- Building Technical Foundations in Cambodia: Partners like NARDI and MarDEC frequently accompanied the project team to field sites. They offered essential technical guidance and supplied crucial biological inputs – such as fingerlings, seeds, and spat – establishing a rock-solid technical and research foundation for local farmers.
Cultivating the Next Generation of Researchers
Crucially, this hands-on institutional support extended far beyond senior faculty. In the cases of CLSU, VSU, and CapSU, university students actively joined the field research, frequently accompanying the teams on the ground. The importance of influencing these students to understand the practical, human dimensions of the sector cannot be undermined.
This direct field exposure is driving a vital shift in how future scientists approach their work:
- Championing Applied Research: Students are stepping away from purely theoretical models to explore actual, field-based realities, realizing the immense value of applied research that directly benefits communities.
- Inculcating a Passion for Biodiversity: Witnessing the direct link between healthy ecosystems and farmer survival has sparked a deep interest in biodiversity among the students.
- Shifting Future Perspectives: The hands-on experience has fostered a profound realization among the youth regarding just how critical ecological protection is for the future of food security.
The Power of Informal Local Allies
The true brilliance of this community of practice was how it naturally drew in informal partners as well. Qualitative reports highlight that groups like the Fisheries Administration (FiA) and Local Government Units (LGUs) acted as powerful local allies. While they were not formal consortium members, these groups provided the vital administrative backing and policy support required to ensure that localized innovations were recognized, protected, and allowed to thrive across the region.
Together, this unique mix of localized action, academic science, student engagement, and government backing proves that when institutions step out of their silos, they create an impenetrable safety net for frontline farmers. This united front is what elevates the project from simple agriculture to a true Nature-based Solution – simultaneously guaranteeing immediate human well-being while actively protecting vulnerable ecological landscapes.
7.3 Local Government (LGU) ownership and policy integration
While farmer-to-farmer horizontal scaling helps spread ideas locally, the ultimate driver for long-term, sub-national scale is local government ownership. For these interventions to survive beyond the project’s lifespan, they cannot rely on outside funding; they must be embedded directly into local governance and municipal budgets. Local Government Units (LGUs) and their regional equivalents achieved this through active co-financing and policy integration in the case of Guinayangan.
In the Philippines, the Guinayangan site provides a perfect example of this structural ownership. The LGU did not merely endorse the project on paper; they actively co-financed a municipal Tilapia hatchery to guarantee a decentralized seed supply. Utilizing their legal authority, they also established Local Conservation Zones in the coastal barangays of Sintones and Ligpit Bantayan. This policy move perfectly captures the core definition of a Nature-based Solution: legally protecting broader coastal ecosystems – which often include vital mangrove habitats – while simultaneously supporting the alternative livelihoods that depend on them. In Leyte, field reports highlight how the LGU adopted the native catfish breeding initiative not just as a successful pilot, but as an official municipal model for scaling climate-resilient aquaculture across the entire region via a UK-funded REDAA/UK support.
This crucial institutional buy-in was echoed across the other ARP sites. Records from Kampong Thom, Cambodia, show that local commune councils embedded the co-management of communally governed Community Fish Refuges (CFRs) into their official commune development plans, securing long-term, localized governance for these ecological sanctuaries. IIRR’s engagement in CFRs builds on past work of other international partners. In Ivisan, local government coordination was essential to securing and protecting the coastal zoning areas needed to safely expand the resilient, mobile shellfish rafts.
By integrating these practices directly into local policy and budgets, local governments can transform alternative livelihood strategies from temporary project experiments into the official, funded reality of their communities – ensuring that human well-being and environmental conservation remain permanently linked.
8. Strategic Recommendations and Future Trajectories (The “So What?”)
8.1 Delivering on the funding agency mandate
For international funding bodies, the ultimate question at the end of any development initiative is whether the investment actually delivered sustainable, high-impact value. The Aquadapt-supported ARP sites provide evidence that for IDRC and the Government of Canada, investing in Nature-based Solutions (NbS) – interventions that simultaneously restore natural ecosystems and secure alternative livelihoods – delivers exceptional value for money, deep accountability, and genuinely resilient communities.
This success was driven by a strong partnership orientation. IDRC did not operate as a passive, transactional donor; they were an active, highly engaged partner. By consistently participating in all major events – both virtual and physical – and actively sharing the project’s work through their extensive global networks, IDRC helped amplify these frontline solutions far beyond the pilot sites.
This approach assures long-term accountability. Because these nature-based systems are simple and locally adaptable, they do not require permanent external funding to survive. The project successfully transformed farmers into proud co-researchers and secured direct co-financing and policy integration from Local Government Units (LGUs). By empowering the people to work with their local environment and utilizing science-based protocols to protect vulnerable coastal habitats, the funding has started to embed a self-sustaining, climate-resilient economy directly into the fabric of these rural communities.
8.2 Actionable frameworks for local governments, local organizations and CSOs
Local governments in both countries have already invested considerable time and resources into this project. To transition these innovations from temporary pilots into permanent municipal law, they should adopt the following three-step framework:
Transition from project funding to municipal co-financing: Nature-based systems are inherently low-cost, making them highly accessible for local government budgets. Quantitative project budgets from the Philippines demonstrate that LGUs do not need massive capital to support this transition. Municipalities should directly co-finance decentralized, localized infrastructure – just as the Guinayangan LGU did by co-funding the local tilapia hatchery. By inserting these low-cost items directly into annual municipal agricultural budgets, LGUs can guarantee a local seed supply that enables resilient, short-cycle fisheries, immediately decreasing their region’s reliance on expensive, imported commercial inputs.
Formalize spatial protection through local zoning: These natural systems require safe physical space to thrive, and securing this space is the essence of a true Nature-based Solution. Policy reviews highlight the absolute necessity of spatial protection that simultaneously safeguards ecological habitats alongside human livelihoods. LGUs must use their legislative power to draft official ordinances that protect aquaculture and coastal zones from commercial disruption or over-development. Clear frameworks for this include the establishment of Local Conservation Zones, successfully modelled in the coastal barangays of Sintones and Ligpit Bantayan; the legally protected shellfish zoning established in Ivisan; and the integration of science-based protocols to actively restore and protect 30 hectares of prime mangroves in Koh Kong.
Embed practices into long-term development plans:
To survive changes in local political leadership, these practices must be written into the long-term, official strategy of the municipality. Qualitative institutional data from Cambodia provides the exact model for this step: local leaders in Kampong Thom successfully embedded the co-management of communally governed Community Fish Refuges (CFRs) directly into their official commune development plans. In the Philippines, Leyte successfully adopted the climate-resilient native catfish initiative not just as a pilot, but as a municipal model.
By executing this framework – (i) budgeting for local infrastructure, (ii) zoning for environmental and economic protection, and (iii) embedding into long-term plans – local governments can officially transform their frontline communities from climate victims into resilient, self-sustaining economies that actively restore their natural landscapes.
8.3 Redefining sectoral success:
The ultimate strategic takeaway from the Aquadapt-supported ARP sites is a challenge to the entire aquaculture sector to redefine what success looks like. Sectoral success must also be measured by two integrated factors: ongoing ecological restoration and the tangible improvement of farmers’ daily lives – both in a sustainable form.
When success is redefined this way, the project’s true Nature-based Solutions (NbS) – such as replacing expensive commercial feed with home feed formulations, or utilizing decentralized hatcheries and low-impact modular tanks – are no longer just ‘alternative’ methods; they become the new blueprint for sectoral restoration and resilience. The field data suggest that prioritizing the ecosystem naturally leads to human prosperity. By choosing to measure success through the lens of zero-debt farming, diverse household diets, and the science-based restoration of critical habitats like coastal mangroves, the broader sector can finally move away from a fragile, volume-obsessed model.
Long-term sustainability (Where do we go from here?) Institutional Sustainability:
The ultimate test of any development project is what happens when the external funding officially ends. For the Aquadapt-supported ARP sites, the answer cannot be that these frontline communities simply wait for the next grant cycle. To guarantee that the gains made in both ecological restoration and human prosperity are not lost, the primary focus moving forward must be on institutional sustainability.
We have already seen this transition begin in the field data. In Guinayangan and Leyte, LGUs did not merely observe the project; they actively adopted the localized hatcheries as official municipal assets. In Cambodia, the Kampong Thom Commune Councils wrote the communally governed Community Fish Refuges (CFRs) directly into their long-term development plans. Furthermore, integrating science-based protocols to actively restore and protect prime mangroves in Koh Kong demonstrates how local governance can directly champion coastal conservation alongside alternative livelihoods.
An important critical step is to expand and institutionalize these successes. Post-funding, local governments must take full administrative and financial ownership for these systems. Because true NbS – interventions that simultaneously protect vulnerable ecosystems and secure household food security – are inherently low-cost, local governments can easily absorb these costs.
Community Sustainability: Agricultural projects frequently fail when communities abandon new methods the moment external subsidies dry up. Evidence from the ARP sites indicates that these frontline farmers will continue these practices completely independently. This enduring commitment stems from a profound mindset shift: the economic and ecological benefits of risk aversion have been deeply and permanently internalized.
A farmer who has directly experienced the massive, daily cost savings of replacing commercial inputs with localized feed, or a household that has established a brand-new, independent income stream through women-led post-harvest value addition (such as the Guinading dried fish in Guinayangan), will not willingly return to the fragile, debt-heavy system of single-crop farming.
Ultimately, community sustainability is guaranteed because these interventions make immediate, daily economic sense while intrinsically relying on a healthy environment. By transforming aquaculture from a high-risk gamble into a diversified, resilient livelihood, the project has ensured that these communities will actively choose to champion their nature-based systems – and fiercely protect the surrounding natural habitats, such as prime coastal mangroves, that sustain them – long after the official initiative concludes.
Sectoral influence: Mainstreaming Nature-based Solutions: Currently, national agricultural policies often treat Nature-based Solutions (NbS) as localized side projects, pouring the vast majority of funding and policy support into large-scale, industrialized aquaculture.
The project data demonstrates that the traditional “hardware-first” approach is a fragile, high-risk model for frontline communities facing extreme weather. In contrast, integrating low-cost natural systems. Crucially, these systems do more than just protect household yields; they align smallholder livelihood diversification directly with macro-level ecological preservation, complementing science-based protocols designed to restore and protect critical coastal environments.
It is time to transition NbS from a fringe experiment into mainstream policy. National agencies must officially embed these integrated, nature-based practices into their core aquaculture development plans. By elevating NbS to the center of national climate adaptation strategies, governments can transform small-scale rural aquaculture into robust, self-sustaining economies that sustainably restore the natural world.
9. Key project documents and references
I. Baseline and Impact Assessments
- Baseline Survey Report: Climate Vulnerabilities and Production Metrics in Small-Scale Aquaculture across ARP Sites
- Financial Tracking and Economic Impact Analysis of Nature-based Solutions (Azolla Feed Integration and Post-Harvest Value Addition)
- Synthesis Report: Qualitative Focus Group Discussions on Farmer Mindset Shifts and Economic Risk Aversion
II. Formal Case Studies and Outcome Stories
- Outcome Story: Native Catfish Hatchery Recovery and VSU-Tolosa Consortium Intervention in Leyte
- Case Study: Localized Tilapia Hatcheries and VeggieShade Integration in Guinayangan and Ivisan
- Field Report: Economic Multiplier Effects of ‘Guinading’ Dried Fish Production
III. Policy, Governance, and Institutional Frameworks
- Policy Dialogue Report: Nature-based Solutions in Small-scale Aquaculture (NARDI, MARDEC, and FiA – Cambodia)
- Municipal Ordinances and Local Conservation Zone Declarations (Sintones and Ligpit Bantayan, Guinayangan LGU)
- Commune Development Plans: Institutional Co-management of Community Fish Refuges (Kampong Thom, Cambodia)
- Aquadapt Consortium Framework: Operational Guidelines for Integrating Academic, Field, and LGU Partners
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¹ Principal Investigator and Advisor, International Institute of Rural Reconstruction (IIRR); ² Co-Investigator and Senior Advisor, IIRR; ³ Co-Investigator and Director, IIRR, Philippines; ⁴ Project Manager, Aquadapt Project, IIRR.
