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Algal blooms, though less widely discussed than other environmental concerns, are rapidly emerging as a serious threat to Nepal’s aquatic ecology, public health and economic sustainability. While pollution debates often center on waste management and air quality, nutrient pollution—which drives algal blooms—demands urgent attention.

Algal blooms are dense clusters of algae—ranging from single-celled to complex multicellular organisms—that form on the surface of lakes, ponds, reservoirs and slow-moving rivers due to excess nutrients, mainly phosphorus and nitrogen. This process, called eutrophication, is often caused by human activities such as untreated wastewater, sewage discharge, agricultural runoff and fertilizer use. The resulting uncontrolled algal blooms have severe ecological, health and socioeconomic consequences.

The science behind

Algal blooms arise due to a range of factors including eutrophication, climate change, the introduction of invasive species and nutrient-rich conditions from aquaculture. Agricultural runoff, particularly from chemical fertilizers and manure, is a key driver of eutrophication, while invasive species can exacerbate bloom frequency. Rising global temperatures and altered weather patterns linked to global warming and climate change create environments conducive to algal proliferation. Aquaculture practices further contribute by introducing high nutrient levels promoting algal growth.

Though algae play fundamental roles in aquatic ecosystems by producing oxygen and forming the base of several food chains, excessive nutrients—mainly nitrogen and phosphorus—cause algal overgrowth and ecological imbalance. This blocks sunlight, reduces oxygen and releases toxins hazardous to aquatic life, disrupting food chains and posing serious public health risks. Cyanobacteria, or blue-green algae, are particularly menacing due to their production of cyanotoxins, such as those from the genus Microcystis, which threaten both humans and animals. Climate change exacerbates this risk, as warmer, stagnant waters promote algal growth. Decreased water flow due to drought, water extraction and altered waterways further supports algal blooms by causing thermal stratification.

As algae die and decompose, they release nutrients back into the water, fueling further blooms. Algal toxins, like those from Alexandrium, can accumulate in seafood and cause paralytic shellfish poisoning, while cyanobacterial toxins compromise potable freshwater sources, recreational waters and fisheries. Human exposure occurs through direct contact, ingestion of contaminated fish or inhalation of toxin-laden droplets, leading to serious health concerns.

Challenges for Nepal

Algal blooms are critically impacting several prominent lakes and reservoirs in Nepal, each holding significant ecological, cultural and economic value. These water bodies are increasingly vulnerable due to rising nutrient levels from human activities and environmental changes. 

Located in the Pokhara valley, Phewa lake is a major tourist destination facing algal blooms due to nutrient pollution. A 2020 study by Kathmandu University’s Environmental Science and Engineering Department classified it as eutrophic, with a Trophic State Index (TSI) of 59, indicating high biological productivity. The Center for Research for Environment, Energy & Water reported that during the monsoon, Phewa, Begnas and Rupa lakes were mesotrophic (TSI: 40-50), suggesting moderate nutrient levels. Despite usually clear water, these lakes are at increased risk of anoxia during summer. The nutrient influx from agricultural runoff and waste accelerates eutrophication, threatening biodiversity, aesthetic value and ecotourism.

The Kulekhani reservoir, situated in Makwanpur district and crucial for hydroelectricity generation, is also facing eutrophication. The same 2020 study reported a TSI of 62, indicating its eutrophic status. The reservoir’s deteriorating water quality due to nutrient pollution poses risks to aquatic life, ecotourism and public health.

Maipokhari, a mid-hill wetland in Ilam district significant for its religious value, is experiencing elevated nutrient levels, particularly phosphates and nitrates, leading to algal blooms. The dissolved oxygen levels fall below Nepal’s water quality guidelines, signaling poor conditions for aquatic life. Increased chemical oxygen demand further promotes the growth of algae and aquatic weeds.

The Jagadishpur Tal, an artificial reservoir in Kapilvastu, Lumbini province, built for irrigation and fed by the Vanganga river, is rich in biodiversity but faces algal bloom risks due to its highly productive nature. A 2008 study by Tribhuvan University's Environmental Science Department revealed the reservoir to be hypereutrophic, with excessive macrophyte growth and elevated levels of phosphate (>387 µg/L) and nitrogen (>200 µg/L), injuring its ecological health.

The Beeshazari lake, located in Chitwan National Park's buffer zone, has experienced significant algal blooms. A 2012 study by Niraula et al. found high concentrations of nitrogen (>1324 µg/L) and phosphorus (>218 µg/L), supporting the growth of aquatic macrophytes like Lersia hexandra, Trapa bispinosa and Eichhornia crassipes. These blooms decrease the lake’s aesthetic value, reduce open water surface and lower oxygen levels, threatening biodiversity and ecotourism.

The Ghodaghodi lake, an oxbow lake in Kailali district of far-western region, has phosphorus levels exceeding natural ranges and WHO guidelines, indicating hypertrophic conditions and significant algal blooms. Elevated nutrient levels, mainly from agricultural runoff and human encroachment, threaten the lake’s ecological balance and biodiversity.

A key economic driver in the Tarai region, however, fish ponds are experiencing rising red algal blooms, primarily caused by Euglena sanguinea, as reported by Mandal and team from Agriculture and Forest University in 2016 and 2018. The excessive use of fertilizers by farmers to boost fish production creates eutrophic conditions that promote the growth of harmful phytoplankton, including euglenophytes. These red blooms, common in shallow, nutrient-rich waters, threaten pond ecosystems, fish health, public health and the local economy.

Socioe-conomic impact

Nepal’s lakes and reservoirs are vital for ecological balance, biodiversity, and ecotourism. Algal blooms, driven by nutrient influx from rapid urbanization, agriculture, excessive use of pesticides and fertilizers, deforestation and improper waste disposal, pose severe ecological, health and socioeconomic menaces. Without intervention, eutrophication could irreversibly damage aquatic ecosystems and the livelihoods they support.

Economically, tourism—crucial for the local and national economy—is especially vulnerable. Degraded water quality from blooms diminishes the aesthetic and recreational values, deterring tourists and reducing revenue. Additionally, foul-smelling lakes deter boating and fishing, further impacting ecotourism. The fishing industry suffers as well as algal blooms create ‘dead zones’ with low oxygen, leading to fish kills and reduced fish stocks, which threaten fishermen’s livelihoods. Contaminated fish are unsafe for consumption, decreasing market demand and harming the industry.

Socially, communities that rely on water bodies for drinking, irrigation, aquaculture and fishing face economic and health risks. Cyanobacterial toxins can contaminate drinking water supplies, leading to severe health consequences. Despite the gravity of the issue, community and local government involvement in managing and mitigating algal blooms remains minimal. Raising public awareness and encouraging local participation in water management and conservation is crucial.

The path forward

Global efforts to combat algal blooms offer valuable lessons. In 2022, the US Environmental Protection Agency’s One Water approach highlighted the need for multisectoral collaboration among agriculture, industry and government to manage nutrient pollution. It emphasizes reducing nutrient inputs through sustainable farming, enhanced wastewater treatment and stringent regulation, showcasing the need for multi-stakeholder cooperation in mitigating water pollution.

A promising approach from Japan involves using algicidal bacteria associated with seagrass beds to inhibit toxic Chattonella antiqua—fish-killing algae. Dr Inaba’s research highlights this eco-friendly solution that avoids harsh chemicals and underscores the importance of restoring seagrass beds, serve as natural habitats for these beneficial bacteria and maintain coastal ecosystems.

In the USA, biological control using parasitic organisms, such as Amoebophyra, targets toxic algae species-Alexandrium but requires careful evaluation to avoid long-term ecosystem disruption. 

Bioremediation with algicidal bacteria like Thalassospira has shown promise in lysing harmful algae such as Karenia mikimotoi, Proteobacterium, Pelagibaca abyssi inhibits toxic dinoflagellates like Pyrodinium bahamense, while Pseudomonas fluorescens affects winter-blooming diatoms, Stephanodiscus hantzschi, though results vary. These findings highlight the need for extensive field testing of biological controls to validate the efficacy in natural ecosystems. Introducing invasive species or large-scale bacterial dispersals raises biosafety concerns, as bacteria like Vibrio, Shigella, and Alcaligenes pose risks to health and the environment. Recent nanoparticle research shows potential through photocatalysis, but toxicity concerns necessitate careful evaluation.

To mitigate rising algal blooms, a multipronged strategy is essential, including reducing agricultural runoff, preventing waste dumping, and enforcing regulations to limit nutrient pollution. Effective early detection, monitoring and research are crucial for assessing algal species, bloom development, and specific impacts, allowing for timely management. Increasing community awareness and involvement, along with empowering surrounding communities, youth volunteers and local governments, is vital for effective water management and conserving natural resources, which will enhance ecosystem resilience.

In conclusion, algal blooms pose a significant empirical menace to Nepal’s aquatic ecosystems health and economic future. However, through the effective implementation of preventative measures, regulatory enforcement and bioremediation techniques, we can restore the ecological balance of these lakes and reservoirs. Preserving these much-needed freshwater bodies is crucial not only for environmental sustainability but also for ensuring the country's long-term economic prosperity.

The authors are Nepal-based researchers in the frontiers of biological sciences

In today’s hyper-connected society, where we are inundated with a constant stream of information and opinions, silence can feel like an outdated concept. From social media updates to workplace chatter, the expectation to engage, share and respond instantly is ever-present. Yet, amidst this noise, there lies an often-overlooked strength: the power of remaining silent. Silence, far from being passive, is an active and intentional force, as I recently reflected during a workshop where an insightful keynote speaker spoke about its transformative potential.

Silence is not just about withholding words; it is about creating space for reflection, understanding and thoughtful response. It is a tool seldom used, but it holds immense potential, both in daily conversations and in moments of high tension. In a heated argument, for example, the person who pauses to listen rather than rushes to speak can turn the whole dynamic. That moment of silence provides clarity, allowing for solutions that may have otherwise been missed in the heat of the moment.

Ancient mythology, rich in lessons of human behavior and decision-making, repeatedly highlights the value of silence as an instrument of wisdom and strength. Take, for instance, the Mahabharata, where Yudhishthira, the eldest Pandava, is known for his calm and collected personality. In moments of conflict, he often remains silent, not out of indecision, but as a way to deeply reflect and weigh his words carefully. His silence, far from being submissive, was a mark of self-control, allowing him to bring clarity and resolution in times of chaos—a practice we could all benefit from in our fast-paced world.

Greek mythology also teaches us about the strategic power of silence. In the tale of Odysseus and the Sirens, Odysseus orders his men to plug their ears with beeswax to avoid the deadly call of the Sirens. Their survival depended on this silence, a disciplined refusal to respond to the seduction of noise. In many ways, this story mirrors our modern lives, where distractions and temptations constantly call for our attention. Sometimes, silence can be our greatest defense, allowing us to stay focused and true to our course.

Beyond mythological tales, silence is invaluable in today’s professional world. Leaders who practice restraint and listen, rather than dominate every conversation, often exude quiet confidence. Their silence signals control—not over others, but over themselves. By listening, they gain insight into various perspectives, which ultimately leads to better decision-making. Silence, in this sense, becomes a tool for leadership, allowing for more thoughtful and inclusive outcomes.

Moreover, silence can be an act of resistance. In a world that demands constant opinions, choosing not to speak is a bold statement of independence. It shows that we do not need to rush to respond, that we are capable of processing and reflecting in our own time. Silence can be a form of empowerment, offering us the space to deepen our understanding before we act.

This wisdom is mirrored in the Bhagavad Gita, where Lord Krishna advises Arjuna to find detachment and inner calm. This form of mental silence allows for clarity in action—a lesson that reminds us of the power of controlling our thoughts before responding to the world.

On a personal level, silence offers restoration. We often underestimate the mental and emotional benefits of solitude and quiet reflection. In moments of silence, we recharge, realign and sometimes gain insights that were drowned out by the noise. Silence can restore our creativity, our focus and our connection to ourselves.

Of course, there are times when silence is not the answer. There are moments when speaking out is necessary, and silence can imply complicity or indifference. The key lies in discernment—knowing when to use your voice and when to withhold it. But when used wisely, silence can turn the tide of a conversation, a decision or even an entire movement.

In today’s loud and fast-paced world, silence is an undervalued strength. As the stories of Yudhishthira, Odysseus and Arjuna teach us, silence is not about the absence of sound, but the presence of thought. It requires discipline, self-control and patience. As we navigate the overwhelming noise of modern life, perhaps it is time to rediscover the power of silence—a power that speaks volumes without saying a word.

Dementia, which marks various stages and levels of cognitive decline, currently lacks a cure, emphasizing the importance of prevention and supportive care. Individuals coping with this condition often struggle to communicate their needs and experiences, leaving them at a higher risk of abuse and neglect. Each year, on Sept 21, the World Alzheimer’s Day (WAD) shines a spotlight on this issue, aiming to raise awareness and drive action to protect elderly individuals, especially those suffering from dementia. Officially recognized by the United Nations General Assembly in Dec 2011, WAD underscores the need for global recognition and response to dementia, which transcends socioeconomic, societal, religious and cultural boundaries.

From my experiences, I’ve found that elders who suffered from dementia often fall into various categories of abuse. Dementia, which manifests in different stages and levels of cognitive decline, currently has no cure. The most effective approach involves focusing on prevention, understanding their daily habits and assisting them in managing the condition, as patients themselves lack the capacity to do so. In the clinic, I primarily deal with dementia patients, and whenever I discuss with their families, it becomes apparent that these patients face some sort of neglect or verbal abuse. This is evident through their behaviors and expressions during discussions about the patient. I can see the negative impact of misunderstanding at home on the patient.

Based on this, I counsel family caretakers about the factors that trigger negative behaviors in dementia patients. I educate family members on these trigger points to help control the factors so that dementia patients do not exhibit problematic behaviors. Since dementia patients are unable to control their behavior or the situation, only family members can manage these trigger points. These are the aspects I focus on when counseling my patients' family caretakers.

As family caretakers are often unaware of these factors and trigger points, their patience and tolerance can quickly run out, leading to a negative social environment. Hence, awareness is crucial for both the patients and their family members to maintain a positive environment at home.

After counseling, I’ve received positive feedback from the family members and witnessed the positive impact on the patients themselves. Family members have mentioned that the social environment is much more positive, and it has become much easier to care for the patients. Therefore, I strongly recommend spreading awareness of these trigger factors, not just for the well-being of the patients but also for the family members taking care of them.

The concept of deliberative democracy and wide usage of mass media have led to discourses on effective public policies. Recently, I participated in a policy discussion program where one of the hosts asked, “Is it correct to say that Nepal has ‘effective’ policies but often fails in their implementation?” A good majority of participants almost fully accepted the statement, but it made me reflect on the issue and a few more questions cropped on my mind. 

Despite a resounding yeah from the audience, is this a valid proposition substantiated by adequate evidence? 

Do we truly have effective policies? How often ex-ante and ex-post policy analyses are done? There is no doubt that an effective policy itself is implementable or actionable. So, this article will focus on ways to ensure effectiveness of public policies to make them more operative by ensuring people’s participation and evidence in policy-making.

Public policy is a deliberate attempt to address different societal programs. Decision-making is a thoughtful process, but have we ensured considerable diverse citizen participation in the process? It is the prime question. Public policies deal with important issues of people ranging from the womb to post-tomb, from streets to space. Considering this fact, policymakers need to be more open rather than myopic to provide ample opportunities to incorporate public concerns. If people participate, diverse thoughts can be addressed with optimum consensus in a given time. This kind of practice, ultimately, assists in settling the eclectic issues in a multilingual, multicultural and multiracial society like Nepal. 

Multitude ways are available for civic participation in decision-making. According to Robert A Cropf and JL Wagner, what kind of governance is in operation in a state is the key determinant of the degree of people’s participation. Among the three kinds of democracy: aggregative, direct, and deliberative, deliberative democracy emphasizes the importance of public discourse in creating political opinions, gathering support for various candidates and positions, and influencing policy decisions. Furthermore, Sherry Arnstein (1969), the writer of “A Ladder of Citizen Participation’’, posits that there are eight types of participation in decision-making. She argues that citizen power should be at the center, and they should be authoritative inputs and deciders throughout the policy process. If we critically analyze Nepal’s context, the policy actors seem reluctant to extend their arms; they rather engage in manipulation and placation, as Arnstein said. 

However, only the people’s engagement in decision-making is not enough. To what extent liberty or authority is given and voices are heard significantly matter. Archon Fung, another famous scholar, questions the ways of participation thus: Who is allowed to participate? Is the sample representative of the population? What is the method of policymaking? 

The issues raised by Archon are significantly relevant in Nepal as well to make a government functional. The policymakers frequently reiterate that Nepal has a participatory decision-making process. However, who is exercising power, and to what context are the big inquiries in the present context? Most of the time, the political process revolves around powerful interest groups and elite sets resulting in the participation of concerned stakeholders in a tokenistic gesture. An evidence of this: Even top-level government authorities seem busy directing and circumscribing provincial and local entities in many ways.

The next most fundamental operational quality of public policy is evidence-based, supported by research-led information. The ideological policy formulation process cannot be effective as it abhors facts and proofs, logic and reasons. The Blair government in the UK shifted to an evidence-based method from ideological policy formulation in 1999 for modernizing the government whereas in Nepal, the whims of an individual, or a person’s institutions are still the basis for making decisions. For instance, the decision on the mandatory national card for social security funds, the development of infrastructure, the distribution of social security funds, etc are only some of the decisions that the government of Nepal has taken without precise research and analysis. It is obvious that generating evidence requires research, resources and patience. To nourish this process, the authority and resources granted to people should not get bridled in any way.

There are certain crucial features associated with evidence-based policy. If those are not met or addressed, policies cannot be effective. Firstly, there should be comparative events over the effects. The second important element is mass support. The third one is a claim with Sound Foundation. For instance, the government decided on obligatory possession of the national ID card a few months ago to receive all kinds of public services. But it quickly reneged because of intense dissatisfaction on the part of the public. It goes without saying that government decisions should be justifiable and feasible, and they should be based on solid evidence.  If the government had been able to convey the importance of the ID card to the public, the latter would not have opposed the initiative. 

People’s participation from different sectors, strata and evidence-based policies are scaffolding for attenuating democracy. In developing countries like Nepal, where the democratic practice is at an infant stage, citizen participation can appear as a retrofitting mechanism. The wider the civic opportunity gap, the more the threats to the policies, leading to a constant peril to the political system. Of late, so many issues have surfaced in Nepal because of this, ranging from provincial politics in Koshi to the issue of youth exodus to constitutional amendment to quality education. All these issues demand equal and meaningful civic engagement. To address such alarming issues with consensus and feasibility, adequate evidence and constant interaction and communication between the government and the people are a must. 

In conclusion, new thoughts in governance and extensive usage of mass media have laid vicarious demands on policymakers to make public policy more effective.  Policy effectiveness can be ensured in many ways, among them policymakers should ensure meaningful wider citizen participation and evidence compliance in decision-making by analyzing the feasibility of policies. If decision-makers keep abreast of these issues (at least), policies will have higher chances of implementation.

The author is a faculty member at Public Administration Campus, TU