Over the last three decades, shrimp farming in saline and semi-saline ponds has expanded rapidly and become a dominant livelihood strategy in many coastal areas. The coastal region, comprising 19 districts and home to nearly 38 million people, relies heavily on agriculture, aquaculture, and small-scale fisheries. Today, communities on the frontline of climate change are struggling with rising salinity and declining freshwater availability, making the transition toward resilient and well-managed aquaculture more critical than ever for supporting fragile livelihoods.

Salinity intrusion refers to the movement of saline water into freshwater systems such as rivers, soils, and aquifers, causing profound physical and chemical changes. In Bangladesh, this process has accelerated due to natural drivers such as sea-level rise, tidal surges, and reduced dry-season river flows, alongside human-induced pressures including upstream freshwater diversion, poor water governance, unsustainable land-use practices, and inadequate regulation and management of coastal aquaculture systems. During dry seasons, when river discharge is insufficient to repel seawater, the saline front advances further inland, increasing both surface and groundwater salinity.

According to the Soil Resources Development Institute (SRDI), saline-affected land in Bangladesh expanded from 0.83 million hectares in 1973 to over 1.056 million hectares by 2019, an alarming increase that underscores the persistence and severity of the problem. This expanding salinity footprint directly threatens aquaculture systems that depend on stable water quality conditions.

Key Impacts on Aquaculture and Livelihoods
Shrimp aquaculture initially generated high to moderate profits, attracting farmers to convert agricultural land into saline ponds. However, over time, socio-economic benefits have declined due to frequent viral infections, disease outbreaks, poor drainage, and rising soil and water salinity across entire farming landscapes. Erratic rainfall, temperature stress, and increasing siltation of riverbeds have further reduced the suitability of coastal environments for both crops and aquaculture.

As a result, many farmers are now attempting to revert to paddy–aquaculture integrated systems, which are more socially acceptable, environmentally friendly, and better aligned with the delta’s natural ecology. In this climate-stressed region, smallholders increasingly seek resilient livelihood strategies capable of adapting to rapid biophysical and socio-economic changes.

The major impacts of salinity intrusion on aquaculture include:

Reduced Productivity: Elevated salinity levels severely affect freshwater fish species such as carp and tilapia, leading to high mortality rates and reduced overall aquaculture output.

Land Degradation: Unplanned and poorly managed conversion of farmland into saline aquaculture ponds can degrade soil structure, reduce fertility, and increase waterlogging, making land unsuitable for future agricultural use.

Increased Livelihood Risk: Inadequate institutional support and unequal access to resources in brackish water aquaculture systems can exclude marginal farmers, often resulting in land dispossession and loss of income for poorer households.

Disease Vulnerability: Salinity fluctuations weaken the immune systems of aquatic organisms, increasing susceptibility to disease and undermining long-term aquaculture sustainability.

Impacts on Communities and Food Security
The transition toward saline aquaculture systems has also reshaped rural society. Wealthy and influential actors often benefit disproportionately from shrimp farming, while traditional farmers and laborers face declining employment opportunities and widening income inequality.

Salinity-induced scarcity of drinking water, reduced crop production, and loss of grazing land for livestock have intensified health and nutritional challenges. Many households are forced into seasonal or permanent migration in search of alternative livelihoods. Declining availability of freshwater fish, milk, and vegetables has further weakened food and nutrition security in coastal communities.

Although some areas have adopted salinity-tolerant crops and integrated farming systems, the overall trend points toward increasing vulnerability, particularly for landless and smallholder households.

Drivers of Salinity Intrusion
The drivers of salinity intrusion in coastal Bangladesh are both climatic and anthropogenic. Climate change has intensified sea-level rise, altered monsoonal patterns, increased average temperatures, and heightened the frequency and intensity of cyclones and storm surges. These processes contribute to embankment breaches, tidal flooding, land erosion, and widespread saline water inundation.

Human interventions such as reduced upstream river flow due to dam construction, poorly planned embankments, deforestation, weak governance, and inadequate regulation and monitoring of coastal resource use have compounded these impacts. Cyclones such as sidr (2007) and Aila (2009) caused extensive and long-lasting salinization of agricultural lands, freshwater ponds, canals, and rivers, with consequences that persist to this day.

For many farmers, aquaculture remains a vital livelihood strategy, but its sustainability increasingly depends on improved management, governance, and climate-resilient practices.

Professional Management and Adaptation
Despite these challenges, the industry is moving toward modern, resilient technologies. Mismanagement is being replaced by scientifically informed strategies:

Automated Monitoring: Adoption of real-time IoT sensors allows farmers to manage tidal intake and prevent “salinity shocks”.

Advanced Systems: Implementing biofloc and closed-loop recirculating systems (RAS) minimizes the need for external water exchange.

Diversified Models: The “Golda-Paddy-Vegetable” model, using salt-tolerant varieties, stabilizes the farm ecosystem.

Infrastructure: Strengthening polder embankments and improving drainage canals are essential to prevent waterlogging.

By adopting optimal stocking densities and biosecurity measures, aquaculture improves its resilience and sustainability. Addressing salinity contributes to SDG 2 (Zero Hunger), SDG 12 (Responsible Consumption and Production), SDG 13 (Climate Action), and SDG 14 (Life Below Water).

The Sundarbans Context: Risk and Opportunity
Aquaculture in the Sundarbans and its surrounding islands is particularly vulnerable to climate change. Cyclones and storm surges frequently inundate fishponds with saline water, causing dyke failure, mass fish mortality, disease outbreaks, water quality deterioration, and escape of stocked species. Farmers often rely on short-term coping mechanisms that offer limited protection.

Long-term resilience requires scientifically informed adaptation strategies that reduce negative impacts while enhancing positive outcomes. As salinization continues, some areas may shift toward regulated brackish water aquaculture systems. However, such transitions must be carefully managed to avoid repeating past mismanagement practices and ensure proper planning, environmental safeguards, social equity, and sustainable seafood production.

Salinity intrusion is a present and escalating challenge for coastal livelihoods. Addressing it requires integrated planning, stronger governance, and climate-resilient aquaculture practices. With decisive action and improved management, Bangladesh can protect its coastal food systems and ensure sustainable seafood production for the future.

Md. Shofiullah
Student, Department of Oceanography
Noakhali Science and Technology University

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It’s time to stop asking for sacrifices and start making offers. The paradigm must shift from perpetual philanthropy to smart, market-based investment. This isn’t about commodifying nature; it’s about aligning our financial systems so that a healthy ecosystem becomes the foundation of a thriving local economy. The new bargain is simple: we invest in community-led enterprises that generate revenue from conservation, creating a powerful, self-funding loop of ecological and economic resilience.

This isn’t a theory; it’s a working model already delivering returns for people, planet, and investors. Let’s talk about few.

The Carbon Deal. Coastal communities restore mangrove forests, vital carbon sinks and storm barriers. In return, they sell verified carbon credits. The bargain: investors get high-integrity offsets; the planet gains carbon sequestration, biodiversity, and coastal protection; and communities secure a durable revenue stream.

The Sustainable Food Deal. Impact enterprises are equipping smallholder farmers with regenerative agriculture and climate-smart aquaculture techniques. The bargain: farmers’ yields and incomes rise, their environmental footprint falls, and investors tap into the growing market for sustainable goods, de-risked by improved community resilience.

The Eco-Tourism Deal. Community-owned lodges and guided experiences make wildlife and wilderness more valuable alive than exploited. Tourists get authentic experiences, local people gain pride and income, and investors back a business model where conservation is the core asset, not the collateral damage.

These examples reveal a transformative principle: the structure of finance dictates the behavior it produces. Grants can protect land, but investments build constituencies. They create durable incentives that align local communities, global capital, and the environment. This is how conservation becomes scalable, investable, and resilient beyond donor timelines.

For donors and Development Finance Institutions (DFIs), this is a strategic pivot—not a departure from purpose, but an evolution of method. Their role is to catalyze and de-risk a new asset class: climate-smart, community-based enterprise. Catalytic capital can take the first-loss position, fund technical assistance, and measure success not only in hectares or species but also in livelihoods secured, revenue generated, and tons of CO₂ sequestered.

By prioritizing private sector partners who embed conservation in their business models, whether through regenerative farming, sustainable aquaculture, eco-tourism, or carbon markets, DFIs can unlock a new generation of scalable impact enterprises. These models prove that conservation and commerce can reinforce one another rather than compete for survival.

The private sector, too, must evolve its role, not as a peripheral partner to philanthropy but as the engine of climate resilience. Impact investors, local entrepreneurs, and market facilitators are showing that financial returns and ecological restoration can coexist, provided the incentives are structured correctly. The aim isn’t to monetize nature, but to mobilize capital toward its regeneration.

Philanthropy, meanwhile, has a new and vital role: not to sustain conservation indefinitely, but to prime the pump, absorbing early risk, building proof of concept, and paving the way for private capital. When used strategically, donor funding can shift from being a perpetual subsidy to a catalytic spark that draws in larger, longer-term investment.

The challenge is no longer scientific or moral, it’s financial. We know how to restore mangroves, regenerate soils, and protect coral reefs. What we lack is a financial architecture that rewards these actions as rational economic choices. It’s time to move beyond charity and build a marketplace where protecting the planet is not just virtuous, but valuable.

I urge all of us to rethink what investing in conservation means. Let’s not do it out of guilt or goodwill, but because it’s the smartest investment we can make — in our planet, our economies, and our shared future.

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The number of critically endangered freshwater turtles, Batagur Baska (Northern river terrapin), is gradually increasing in the rivers of the Sundarbans thanks to various conservation efforts. The forest department has been working to conserve this rare species under the Bangladesh Forest Department’s Turtle Breeding Program in collaboration with the IUCN and Vienna Zoo.

The Batagur Baska is currently one of the three rarest turtle species in the world. The rivers of Bangladesh, Myanmar, and northeast India were home to these animals in the previous century.

However, when the overfishing and egg harvesting went unchecked, this river terrapin came to the verge of extinction. Although the populations of turtles stayed relatively constant as long as they were caught and eaten primarily to assist in meeting the fundamental needs of the local population.

All of that changed when hunting became more industrialized and vast quantities of animals were exported to China for profit.

In 2010, only 20 individuals were reported worldwide.

However, the scenario drastically changed when three Batagur Baska turtles laid a total of 82 eggs on February 15 at the Karamjal Wildlife Breeding Centre under the East Sundarbans Forest Division. Among them, a total of 65 hatchlings were born.

According to the Sundarbans East Forest Division, the Karamjal Wildlife Breeding Center has successfully bred this species since 2017. In total, 52 turtles have been released into the wild so far. The rest are being raised in a semi-natural environment for future release.

Forest Officer Md. Belayet Hossain stated that, “Batagur Baska turtles, which are listed as critically endangered globally, were once found abundantly in the Sundarbans. However, due to river pollution, poaching, and destruction of nesting sites, their numbers have sharply declined. Conservation efforts have now made it possible to restore their population.”

The Sundarbans Forest Department believes this initiative will help establish a stable and sustainable population of Northern river terrapin in the wild once again.

Jaber Bin Abdul Bari
Department of Oceanography, NSTU

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The campaign, which began in January 2024, targets the long-overlooked issue of plastic and polythene waste disposal by commercial fishing trawlers. Working initially with 250 mechanized trawlers, the department has begun installing onboard waste bins to collect and return non-biodegradable waste to shore. Each trawler, carrying 30 to 50 crew members on voyages lasting up to a month, previously discarded plastic packaging and supplies directly into the ocean.

Md Faruk Hossain Sagar, Assistant Director (Ocean) at the DoMF Chattogram office, said the initiative stemmed from an awareness campaign that launched in December 2024, targeting trawler owners, captains, and fishing associations.

“Fishermen often carried food and essentials wrapped in plastic, which was casually thrown into the sea,” he explained. “Now, we’ve introduced a system to collect that waste on board and bring it back to shore for proper disposal.”

The collected waste is transferred to Chattogram City Corporation for designated dumping, potentially preventing 20 to 25 metric tons of plastic from polluting the Bay annually.

Director of the Marine Fisheries Department in Chattogram, Md Abdus Sattar, stressed the urgent need for action. “Plastic and torn fishing nets cause ghost fishing and destroy marine habitats. This effort must become a collective social movement,” he said.

The Bangladesh Marine Fisheries Association has extended its support to the initiative, encouraging fleet-wide adoption of sustainable waste management.

The DoMF has its sights set on broader coverage. With over 30,000 mechanized vessels operating in the Bay of Bengal, the department plans to gradually bring them all under the initiative, promoting sustainable fishing and reducing ocean pollution.

Experts have underscored the health risks linked to marine pollution. Dr Zahidul Islam of the Khulna Diabetic Association warned that fish contaminated with microplastics could severely impact human health. “What enters the ocean enters our bodies through the food chain,” he noted.

This initiative signals a significant shift in marine waste management for Bangladesh and could serve as a model for other coastal nations grappling with the devastating impact of ocean plastic on both ecosystem and public health.

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The tradition began in 2001 when the first National Sundarbans Conference was held under the Bangladesh Environmental Movement (BAPA), with participation from Khulna University and 70 other environmental organizations. The conference declared February 14 as Sundarbans Day, and since then, it has been observed every year. This year marks the 25th celebration of the occasion.

Awareness Programs Across Coastal Regions

To honor this day, Sundarbans Academy in Khulna has planned several programs, including seminars, rallies, signature campaigns, painting competitions, bicycle rallies, human chains, and photography contests. Awareness activities will also take place in 17 sub-districts across five coastal districts identified as impact zones of the Sundarbans.

The theme for this year is “Love Sundarbans on the World’s Day of Love.” According to Professor Anwarul Kadir, Executive Director of Sundarbans Academy, the day’s main event will be held at Khulna Press Club in collaboration with the Forest Department. A key focus will be creating public awareness about protecting Sundarbans from plastic pollution and other environmental threats.

A Call for Official Recognition of Sundarbans Day

Professor A. B. M. Abdul Malek, Coordinator of the Sundarbans Protection Movement, has urged the government to recognize February 14 as an official Sundarbans Day. He emphasized that while the Sundarbans play a crucial role in Bangladesh’s survival, increasing salinity, illegal poaching, deforestation, and harmful fishing practices continue to threaten this fragile ecosystem. He called on the Forest Department and the government to take strong, practical measures to protect the forest.

The Vital Role of Sundarbans in Coastal Protection

People living in coastal regions understand the importance of Sundarbans better than anyone. Bidyesh Ranjan Mridha, a lecturer from Kapotakkho College in Koyra, said, “Without the Sundarbans, disasters would have wiped out Koyra long ago. To protect our own future, we must save the Sundarbans. Reducing pressure on the forest and creating alternative livelihoods for local communities is crucial.“
Illegal activities inside the forest, such as poaching and piracy, have also become a significant concern. Azizul Islam, a resident of Bedkashi village, said, “Forest crimes, such as deer and tiger poaching, are on the rise. Today, on Sundarbans Day, we urge the authorities to take immediate action to eliminate these threats.“

The Rich Biodiversity of Sundarbans

According to the Forest Department, the Bangladesh part of the Sundarbans covers 6,017 square kilometers and is home to:

• 528 plant species
• 505 wildlife species, including
  • 49 mammals
  • 87 reptiles
  • 14 amphibians
  • 355 bird species

As per the 2023 wildlife survey, Sundarbans is home to:

• 136,604 spotted deer
• 152,444 monkeys
• 47,515 wild boars
• 25,124 monitor lizards
• 12,241 porcupines

The most recent 2024 survey confirms the presence of 125 Bengal tigers.

The Need for Stronger Conservation Efforts

Mihir Kumar Doe, Conservator of Forests (Khulna region), stressed that the Sundarbans are critical to Bangladesh’s environment and climate resilience. He said,
“We must protect this natural shield at all costs and stop all activities that harm the Sundarbans. While the Forest Department is actively working to prevent forest crimes, protecting Sundarbans requires mass awareness and collective action.”

A Shared Responsibility

The Sundarbans are not just a forest; this is Bangladesh’s lifeline. Without this mangrove shield, the country would face devastating climate disasters, endangering millions of lives. As communities, organizations, and policymakers come together on Sundarbans Day, the message is clear—love for nature must translate into action.

By ensuring sustainable conservation efforts, promoting eco-friendly policies, and providing alternative livelihoods for local communities, Bangladesh can safeguard the Sundarbans for generations to come.

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This dangerous method of fishing, where toxic chemicals are deliberately dumped into rivers and canals to kill fish en masse, is wreaking havoc on aquatic biodiversity, endangering wildlife, and posing serious risks to human health. The alarming rise of this practice has been attributed to a powerful syndicate of corrupt traders, dishonest forest officials, and criminal networks that profit at the expense of one of Bangladesh’s most valuable ecological treasures.

The rise of poison fishing in Sundarbans: A Well-Orchestrated Operation

Investigations reveal that at least three major groups are responsible for fueling the illegal practice of poison fishing in the Sundarbans:

1. Fish Traders and “Company Mahajans” – These influential traders finance local fishermen and pressure them to use poison to ensure a higher catch within a short time. By controlling the fish supply, they reap massive profits.
2. Corrupt Forest Officials – Dishonest officers, tasked with protecting the Sundarbans, accept bribes in exchange for turning a blind eye to the poison fishing. Some even actively assist in the transport and sale of poisoned fish.
3. Forest Pirates and Middlemen – Once inactive, many former forest pirates have returned, this time working as enforcers for the traders. They offer protection to those engaged in illegal fishing while threatening or looting others who refuse to comply.

How the poison fishing Work in Sundarbans

Fishermen use two types of toxic chemicals, depending on their target catch:

• Chlorpyrifos and Cypermethrin – These chemicals are commonly used in agriculture but have been repurposed to kill both white fish and shrimp when mixed into the water.
• Cypermethrin Alone – This is used exclusively to kill shrimp.

Once the chemicals are released into the water, they deplete oxygen levels, causing fish to become weak and float to the surface, making them easy to collect. This method is quick, cost-effective, and highly destructive—not just for fish, but for the entire aquatic ecosystem.

Severe Impact on the Sundarbans Ecosystem

The consequences of poison fishing extend far beyond fish populations. Experts warn that these chemicals are absorbed into the mangrove roots, affecting the entire food chain.

• Declining Fish Stocks – Traditional fishermen report a steep decline in fish populations over the past five years, forcing many to abandon their livelihood.
• Loss of Aquatic Biodiversity – Poisoned rivers have led to the disappearance of snakes, frogs, leeches, and crabs, all crucial components of the Sundarbans’ ecosystem.
• Impact on Wildlife – Birds feeding on poisoned fish suffer slow and painful deaths, contributing to declining populations of species already threatened by habitat destruction.

According to Govinda Mandal, a fisherman from Koyra’s Bedkashi area, poison fishing was non-existent just a decade ago. “There were plenty of fish back then. But over the last five to six years, poisons have flooded the forest waters, and now even the birds are disappearing,” he laments.

A Threat to Human Health

Even though locals avoid eating fish from the Sundarbans, these poisoned fish end up in markets across the country, transported by trucks to Dhaka and other major cities. Consumers are unknowingly exposed to dangerous toxins linked to cancer, liver disease, and neurological disorders.

A researcher, Md Shah Paran, working on a project assessing the aquatic resources of the Sundarbans, confirmed that most fish in local markets smell of poison, particularly shrimp. Despite this, traders continue selling them, prioritizing profits over public safety.

The Role of Corrupt Authorities

Local pesticide shops near the Sundarbans, particularly in Koyra, openly sell chemicals like Diamgro, Fighter, Ripcord, and Pesicol. Strangely, many of their buyers don’t even own farmland—they are fishermen purchasing poison under the guise of agriculture.

Authorities have long been aware of these illegal activities but have done little to stop them. Mihir Kumar Doe, Forest Conservator of the Khulna region, confirmed that bottles of poison have been confiscated multiple times, yet the problem persists.

Fishermen who refuse to participate in the poison trade report being threatened by both criminal groups and corrupt officials.

A former fisherman, who served jail time for poison fishing, revealed their method:

1. Fishermen set small nets across canal openings during high tide.
2. When the tide recedes, they pour pesticides into the water.
3. Fish float to the surface within minutes.
4. The poisoned fish are collected and transported to buyers.

Since freshly poisoned shrimp cannot be immediately sold, traders have devised another method: drying them inside the Sundarbans itself.

• They cut down trees deep in the forest to construct makeshift drying platforms.
• Shrimp are dried using wood-fueled fires before being smuggled to Mongla for distribution.

The Political and Social Consequences

The rampant corruption and illegal exploitation of the Sundarbans have also given rise to a power struggle among criminal groups. Reports indicate that powerful middlemen, including Zahir Member, Rezaul Karim, and Lutfor Rahman, control more than 200 boats, operating under the protection of corrupt forest officials.

Forest guards allegedly demand bribes ranging from Tk 1,000 ($10) per week to Tk 5,000 ($50) per boat, allowing illegal fishing to continue unchecked.

One such trader, Abu Musa, openly admitted his involvement in illegal fishing but suggested “dividing the sanctuary among traders” to reduce competition.

Can the Sundarbans Be Saved?

Despite these overwhelming challenges, conservationists believe that decisive action can still reverse the damage. Gaurang Nandi, Chairman of the Center for Environment and Participatory Research (CEPR), emphasized the urgent need for:

1. Stronger Law Enforcement – Crackdowns on corrupt officials and poison traders.
2. Sustainable Fishing Alternatives – Promoting eco-friendly aquaculture methods.
3. Public Awareness Campaigns – Educating consumers about the dangers of poisoned fish.
4. Stricter Regulations – Enforcing harsher penalties for offenders.
   

Final Thoughts: A Ticking Time Bomb

Conservationists stress the need for immediate intervention to halt poison fishing. They advocate for stricter enforcement, improved monitoring, and sustainable fishing alternatives.

The Sundarbans serves as Bangladesh’s shield against natural disasters and is a crucial carbon sink. If its waters continue to be poisoned, the consequences will be catastrophic—not just for the environment but also for the millions who depend on it for their livelihoods. Urgent action is required to protect the future of this invaluable mangrove forest.

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The committee, led by Dr. Mohammad Sohrab Ali, Additional Director-General of the Department of Environment, and Alamgir Kabir, Senior Assistant Director of the Fisheries Department, conducted a site visit on January 30. They collected water samples from Shatnol, Babu Bazar, Mohanpur, and Eklashpur for further laboratory analysis in Dhaka.

Declining Water Quality and Industrial Pollution Identified as Key Causes

Preliminary water tests indicate that pollution and deteriorating water quality are the main factors behind the mass fish deaths. The pH level in the river has dropped to 6–6.5 ppm, compared to the normal range of 7.5–9 ppm. Ammonia levels, which should be around 0.1 ppm, have risen to 0.2 ppm or higher. Oxygen levels, essential for aquatic life, have plummeted from the ideal 5–5.5 ppm to a dangerously low 1–1.5 ppm.

Experts suspect that chemical waste from factories in Narayanganj and Munshiganj districts is contaminating the Meghna River, disrupting its delicate ecosystem and severely affecting fish populations. The pollution has also altered the migratory path of the prized hilsa fish, a staple of Bangladesh’s seafood industry.

Fishermen Struggle as Livelihoods Collapse

For nearly a month, fishermen from villages along the Meghna River, including Shatnol, Malopara, Babu Bazar, Dashani, Mohanpur, Hashimpur, and Zahirabad, have been unable to catch fish. Native species such as chewa, puti, shrimp, pangash, kachki, boicha, and belye have been found floating dead, along with other aquatic life like frogs, leeches, and snakes.

Local fishermen report extreme financial hardship due to their inability to work. “We have taken loans from NGOs to buy boats and nets, but now we cannot even afford to pay the installments,” said Pradip Chandra, a struggling fisherman. “Our families are going hungry.”

Urgent Action Needed to Protect Bangladesh’s Fisheries Sector

Senior Fisheries Officer Vijay Kumar emphasized the need for immediate intervention to prevent further damage to fish stocks and the livelihoods of thousands of fishermen. Mizanur Rahman, Deputy Director of the Department of Environment, stressed the importance of addressing industrial pollution to restore the Meghna River’s water quality.

This incident underscores the urgent need for stricter environmental regulations, improved wastewater treatment, and sustainable fisheries management to protect Bangladesh’s aquatic resources. Without swift action, the nation’s seafood sector and coastal communities face devastating long-term consequences.

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Flood protection: A natural defense system

Globally, mangroves provide an estimated $855 billion in flood protection services, according to the research of Center for Coastal Climate Resilience at UC Santa Cruz. The Sundarbans itself plays a pivotal role in this contribution, offering irreplaceable protection to Bangladesh’s vulnerable coastal areas, where densely populated communities face recurring threats from cyclones and flooding. Its value extends far beyond national borders, exemplifying the critical importance of preserving such ecosystems for global climate resilience. The Sundarbans, spread over 6000 square kilometers in Bangladesh and about 4000 square kilometers in India, is a critical shield against floods and cyclones for the densely populated coastal regions of Bangladesh. Using advanced flood risk models, researchers have shown that mangroves, such as those in the Sundarbans, reduce storm surges and protect lives, livelihoods, and infrastructure.

The research, conducted by project co-lead, Pelayo Menendez and center director, Michael W. Beck, is featured in the World Bank’s 2024 edition of The Changing Wealth of Nations. As highlighted by the research, the value of mangroves for flood-risk reduction has grown exponentially due to rising coastal populations and increasing climate threats. For Bangladesh, which experiences frequent cyclones, the Sundarbans is a natural barrier that significantly mitigates the impact of these disasters. The devastating Cyclone Sidr in 2007 serves as a stark reminder of how mangroves save lives—areas with dense mangrove cover reported fewer casualties and less infrastructure damage. Furthermore, these natural defenses minimize the long-term economic losses often associated with such disasters.

Biodiversity and livelihoods

The Sundarbans is a UNESCO World Heritage site, home to iconic species such as the Bengal tiger, spotted deer and countless aquatic organisms. It serves as a nursery ground for fish and crabs, ensuring the sustainability of local fisheries. This biodiversity directly supports the livelihoods of millions of people who depend on fishing, honey collection, and eco-tourism. Beyond these tangible benefits, the Sundarbans also holds immense cultural and spiritual significance for local communities.

However, human activities specially brackish water shrimp farming and deforestation have contributed to the degradation of mangroves. Despite this, studies show that the protective benefits provided by mangroves have grown—protecting 61% more people and safeguarding 109% more capital assets from floods in 2020 compared to a decade earlier. This underscores the increasing reliance on these natural assets for coastal resilience. The Sundarbans’ ecosystem services act as a safety net for many vulnerable communities, making its conservation a matter of both ecological and human survival.

Economic and climate benefits

Mangroves, including the Sundarbans, are crucial for Bangladesh’s climate adaptation strategies. By sequestering large amounts of carbon, they help combat global warming. The Sundarbans plays a key role in reducing the country’s vulnerability to rising sea levels and extreme weather events. Moreover, mangroves offer a cost-effective alternative to artificial infrastructure like seawalls, which require significant financial investments and maintenance.

Sustainable aquaculture is gaining momentum as a means of balancing food security with environmental conservation. In Bangladesh, organization like FISHBYTE, an aqua-tech impact startup pioneering efforts to modernize shrimp farming, enabling higher yields from existing land while integrating mangrove restoration into farming practices. Their innovative approach demonstrates how Bangladesh’s low-yield aquaculture can be transformed into climate-smart solutions, supporting biodiversity, enhancing carbon sequestration and reducing the need for land conversion. By incorporating mangrove plantations into aquaculture systems, it exemplifies how environmental restoration can align with economic development, creating a win-win scenario.

The economic benefits of the Sundarbans extend beyond flood protection. The World Bank’s Changing Wealth of Nations report emphasizes mangroves as natural capital assets with long-term value. For Bangladesh, preserving the Sundarbans is not just an environmental necessity but also a smart economic choice. It safeguards fisheries, promotes tourism, and ensures the well-being of coastal communities. The region’s fisheries, for instance, contribute significantly to local and national economies, underscoring the forest’s role in food security and job creation.

Challenges and the way forward

Despite the Sundarbans’ immense value, it faces threats from illegal logging, industrial pollution, and climate change. Rising salinity and reduced freshwater flow from upstream rivers are deteriorating the forest’s health. Additionally, unchecked industrial activities and unplanned urbanization exacerbate these challenges, putting both the ecosystem and the communities it supports at risk. Bangladesh must prioritize mangrove conservation and restoration as part of its national climate-adaptation policies.

Innovative approaches like integrating mangrove restoration with aquaculture demonstrate how sustainable practices can balance economic needs with environmental conservation. By promoting climate-smart aquaculture and integrating mangrove restoration Bangladesh can address the twin challenges of food security and ecosystem preservation.

Investing in the Sundarbans will yield dividends in disaster risk reduction, biodiversity conservation, and economic growth. Learning from global initiatives, such as the Coastal Resilience Explorer tool developed by the Center for Coastal Climate Resilience, can help Bangladesh implement innovative strategies to protect and expand its mangrove cover. Moreover, community engagement and education are critical to fostering a sense of ownership and responsibility for mangrove conservation among local populations.

Global perspectives and local actions

The Sundarbans is part of a broader global network of mangroves that collectively act as climate regulators and biodiversity hotspots. Countries like Vietnam, India, and Indonesia have implemented successful mangrove restoration programs, offering valuable lessons for Bangladesh. These initiatives highlight the importance of government support, community involvement and private sector partnerships in achieving sustainable outcomes. Bangladesh can draw inspiration from these models while tailoring strategies to its unique socio-economic and ecological context.

International collaboration also plays a pivotal role. As climate change knows no borders, global efforts to fund and support mangrove conservation are essential. Bangladesh can leverage its position as a vulnerable yet resilient nation to advocate for increased international assistance and knowledge-sharing platforms focused on mangrove preservation.

Last but not least

The Sundarbans is more than a mangroves forest; it is Bangladesh’s first line of defense against climate-induced disasters and a cornerstone of its environmental and economic resilience. By recognizing the Sundarbans as a natural asset and integrating its conservation into national development plans, Bangladesh can secure a sustainable future for its people while contributing to global efforts to combat climate change.

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Traditionally considered a healthy source of lean protein, omega-3s, and essential nutrients, seafood increasingly carries mercury and microplastics through the world’s oceans-an unsafe condition for humans and wildlife alike. This article provides exploration regarding the dangers of mercury and microplastics accumulation from your seafood, and what can be done to make choices a little safer.

What is Mercury, and How Does it Enter the Ocean?

Mercury is a naturally occurring element, but human activities, especially coal burning, mining, and industrial processes, do release large amounts into the atmosphere. These settle into oceans and waterways, and the mercury is transformed into methylmercury-a toxic compound which bioaccumulates into aquatic food chains.

How Does Mercury Accumulate in Seafood?

Mercury biomagnifies up the food chain as follows:

• Phytoplankton take up methylmercury from the water.
• Small Fish feed on phytoplankton and bioaccumulate mercury in their flesh.
• Predatory Fish, like tuna and swordfish, prey on smaller fish and because of biomagnification take in higher levels of mercury within their bodies.
• The impact is that larger, long-lived species tend to contain unsafe levels of mercury.

Health Risks of Mercury Exposure

Consumption of sea food contaminated with mercury is known to pose health risks:

• Neurological Damage: Mercury interferes with the development of the brain, especially in fetuses, infants, and young children.
• Cardiovascular Problems: High levels of mercury have been associated with heart disease and high blood pressure.
• Immune System Suppression: Long-term exposure suppresses immune response.
• Reproductive Issues: Mercury may relate to lower fertility and damaged fetal development during pregnancy.

The Increasingly Troubling World of Microplastics in Seafood

What Are Microplastics?

Microplastics are defined as small plastic particles less than 5mm in size, originating either from the breakdown of larger plastics or manufactured as microbeads for cosmetics, cleaning products, and industrial processes. These are now ubiquitous marine pollutants.

How Do Microplastics Accumulate in Seafood?

General ways microplastics may reach the ocean include littering, poor waste management, and wastewater systems. They start being ingested from simple plankton up the food web.

Key Pathways of Ingestion of Microplastics:

• Filter Feeders: Most mollusks, such as mussels and oysters, filter in the microplastics along with plankton.
• Predatory Fish: The fish that feed upon the small prey items accidentally tend to consume microplastic.
• Human Exposure: Human beings get exposed to these microplastics when they eat seafood containing the microplastic particles stored in the animal tissues.

Health Risks of Microplastics

Although still under research, the evidence of microplastics in our food is raising an alarm in the following ways:

• Chemical Contaminants: Microplastics can carry harmful chemicals like BPA and phthalates, which disrupt endocrine functions.
• Tissue Damage: Microplastics fragments can damage gut tissues and trigger inflammation.
• Unknown Long-Term Effects: Scientists are still studying how microplastics affect organs and overall health over time.

Seafood Safety Tips: Protecting Your Health

Choose Low-Mercury Options:

Choose fish lower on the food chain, which generally have lower levels of mercury. These include:

• Salmon
• Sardines
• Tilapia
• Pollock

Limit High-Mercury Seafood:

Avoid or limit the following species:

• Tuna (especially albacore and bigeye)
• Swordfish
• King mackerel
• Shark

Choose Wild-Caught Over Farmed:

Wild-caught fish generally have less contamination with antibiotics and microplastics than farmed fish, although it is indeed dependent on the region.

Check Seafood Guides:

Know your safe and sustainable seafood options with the help of a tool like the Seafood Watch Guide or EPA guidelines. Be Careful with Shellfish. Knowing that filter feeders like mussels and oysters tend to concentrate microplastics, enjoy them in moderation and from trusted sources.

The Environmental Implications

• Damaging Marine Ecosystems: Both mercury and microplastics interfere with marine food chains, therefore degrading biodiversity and aquatic health.
• Financial Implications: From Fisheries and Tourism to industries, affected fisheries result in the deterioration of enterprises depending on a clean marine environment.
• Climate Change Links: Mercury emissions and manufacture of plastic are related to high usage of fossil fuel, accelerating climate change.

Mercury and microplastics in seafood are stark reminders of how human activities can affect both environmental and human health. By making better choices and encouraging systemic changes, we can reduce these risks for a more sustainable future that will protect marine ecosystems and ourselves.

Farhana Islam
Agriculturist, Researcher
Fisheries Resource Management, CVASU

The post The dangers of Mercury in seafood & the accumulation of microplastics appeared first on Seafood Network BD.

Sea turtles are an essential component of the planet’s food system, helping to regulate and preserve the health of the ocean. Such as, Hawksbill turtles, which are specialized in consuming a few types of marine sponges, live in coral reefs. The absence of hawksbills allows sponges to grow too quickly, suffocating slower-growing corals until they perish. The hawksbill’s importance to the reef is increasing as threats from climate change and other factors make reefs more vulnerable.

Jellyfish populations are managed by leatherback sea turtles, who are experts at devouring them. Jellyfish populations would skyrocket if leatherbacks went extinct. Since jellyfish feed on larval fish, the sea would be devoid of fish if leatherbacks didn’t exist. It’s all about equilibrium once more.

Sea grasses are the main food source for adult green sea turtles, who serve as aquatic lawnmowers to maintain the health of seagrass beds. Many fish species have access to safe nursery sites, food sources, and habitat thanks to seagrass beds, which are found in shallow marine waters. This allows the fish to avoid predators until they grow larger. In addition to storing carbon, robust seagrass beds stabilize the ocean floor, reducing erosion caused by storms and waves.

Outside of the water, sea turtles also have a positive impact. By leaving their eggs in the sand, sea turtles that are nesting benefit coastlines. The nutrient-rich eggshells and unhatched eggs that are left behind support beach grasses and other dune flora that stabilizes dunes and reduces coastal erosion.

Long migrations are undertaken by sea turtles, who also assist in the movement of diatoms, remoras, algae, and other small crustaceans. Additionally, fish that use them as cover from predators utilize them as a kind of canopy. Similar to a reptile aircraft carrier, sea turtles occasionally offer seabirds a place to land when they need to breathe or rest at the surface of the water.

Sea turtles play an important cultural role for many coastal communities around the world. Many indigenous cultures revere them or consider them ancestors. They are also an important source of income for coastal residents through turtle-watching ecotourism.

It involves everything from preserving healthy coral reef ecosystems to moving vital nutrients from the sea to beaches and coastal dunes. The extinction in many parts of the world has resulted in significant changes to the waters. Our oceans are ill and seriously threatened by pollution, overfishing, and climate change. In order to guarantee resilient and healthy oceans in the future, it is imperative that we safeguard sea turtles and restore their populations to healthy levels.

Farhana Islam
Agriculturist, Researcher
Fisheries Resource Management, CVASU

The post How sea turtles are essential for the balanced aquatic ecosystem appeared first on Seafood Network BD.