Features
British troops in Panadura and going to work in shorts
Excerpted from A Cabinet Secretary’s Memoirs by BP Peiris
The next incident I can remember is a matter of a two-line by-law sent by Davidson, Assistant Government Agent, Matara, which said “The part of the… D.R.C. road lying between the first and the second mile posts is hereby prohibited for lorry traffic over three tons in weight.” I amended the draft to read “No lorry weighing over three tons shall be driven over that portion of the… District Road Committee road which lies between the first and the second mile post on that road.” Davidson took offence at my correcting his draft and inquired why his draft had been amended.
I argued with Mervyn that “that portion” was better than the “part” and that generally my draft was better than Davidson’s. Mervyn agreed with me and wrote accordingly to Davidson. Soon afterwards, a four-paged letter was received from Davidson, citing Fowler’s Modern English Usage, and asking for a full report on the reasons for the amendments. Mervyn was angry. He wrote back to say that his assistant who revised the by-law was far too busy with drafting and had no time to be writing reports on the reasons for the amendments, and that he was not prepared to give a full report or any report other than the report he had already given stating that the draft was in due form as amended in red ink.
He added, that if Davidson would call by appointment at the Chambers of his assistant, the reasons would be orally explained to him. He also added, “You must not be so sensitive as to feel that when your draft is amended in this office, it is a reflection on your capacity to write good English.” Davidson never came to see me.
In 1936, three years after I joined the Public Service, came the Second World War with the necessary influx of allied troops and troop ships and all the evils always associated with war. There was rationing and a shortage of essential commodities, hoarding and black-marketing, rapid money-making by some, the downfall of others as a result of the appointment of the Custodian of Enemy Property, the return of pensioned prostitutes, the WRENS, WAAFS and their male counterparts, the blackout, uncertainty, tension…
It was all there for anyone who wished to see. The ordinary man’s feeling was that the order of the day was, as Charlie Chaplin said in his film “The Dictator”, Tightenden belten! A Commander-in-Chief assumed office, and the Governor became responsible only for the Civil Administration.
It was, as the newspapers said, a phoney war, but our Commander-in-Chief, Admiral Geoffrey Layton was getting the country prepared. Emergency Regulations, drafted by Mervyn and Villavarayan were being turned out of the Government Press faster than ham came sliced out of a machine. Then, one day, Ceylon woke up. On Easter Sunday, the Japanese air-arm dropped some bombs over the Fort of Colombo.
A few days later, they dropped a couple of bombs over Trincomalee. The damage was slight, but the people panicked. Most of those who could afford it left for the hills with their children. Those who could not, parked with friends out of the danger zone.
There was a British Volunteer Brigade stationed at Panadura. The Brigade was a mixed crowd consisting of surveyors, engine drivers, carpenters, London taxi drivers etc. The Officer Commanding, Major… was a King’s Counsel and a snob. There were also a Captain and Lieutenant, both decent men. I once invited the Captain, his junior officer and twenty men (I did not invite the snob) to my house for drinks and a singsong from six to nine p.m. They arrived sharp on time, marching in formation.
Following them came a military van with an enormous crate of N.A.A.F.I. beer. It was the first time that they had been invited by a householder in the town. I had a little gin and whisky and plenty of arrack. Everyone, including the officers, preferred the arrack, and the beer was untouched. With a shortage of servants, my guests had to help themselves, and I laid the drinks out in my small study which could accommodate comfortably only about six at a time. I accompanied each group in until they knew the ropes.
One of them, who looked a typical London taxi driver, saw a picture on my study wall and exclaimed, “Blimey! That’s Lincoln’s Inn.” I inquired whether he was a member of the Inn, and he said, “Lord, no Governor, I’m a taxi driver and know the place well.”
There was good singing and tap-dancing with hobnailed boots on my polished floor. The Captain looked worried and asked me whether his men were not spoiling my floor. I suggested that the boys be allowed to enjoy themselves. At a quarter to nine, the captain gave the order, “Last three songs.” When I inquired why he was bringing my party, which everybody was enjoying, to a sudden end, he said, “Your orders, Sir”.
I asked them to continue for another half-hour. At 9. 30 sharp, there were salutes from the men, handshakes from the two officers, and they were gone after one of the finest evenings I have had. They left for me the unused crate of beer. I remembered a Defence Regulation which penalized the possession, by private persons, of stores intended for the fighting forces.
Early the next morning, there were two of the men on my doorstep saluting me and saying “Good morning, Sir. Captain’s orders, Sir. Sent us to clean and polish your floor, Sir.” My wife gave them a cup of tea instead.
In view of the necessity to tightenden belten in all respects, Governor Caldecott made an order prescribing a new dress for public servants—long trousers and shirt without a tie, or shorts and shirt; no coat need be worn. I avidly seized this opportunity of being able to come to work in the sensible dress and be comfortable during my daily journey by train from Panadura to Colombo and back. The day after the Governor’s order was given publicity in the press, I came to work in khaki shorts and an open shirt.
The lawyers were particular about their striped trouser and black coats and Hultsdorp was surprised to see me in the new attire. A few days later, Mervyn sent for me. When he saw me, there was a look of horror in his face. It was obvious that he did not approve of the dress prescribed by the Governor in a case where the public servant concerned was a lawyer. He mentioned the matter to Sir Robert Drayton, Legal Secretary, who had expressed the view, which Mervyn conveyed to me, that shorts were the last thing a lawyer ought to be seen in while at work. As the Legal Secretary could not countermand the Governor’s order, I continued to wear shorts for the duration of the war and, I am sure, incurred Drayton’s displeasure.
Drayton had been Legal Draftsman of Palestine and, soon after he assumed duties as Legal Secretary of Ceylon, Mervyn took all his assistants with him to listen to a talk by Drayton on legislative drafting. The talk was interesting and instructive. Sir Robert, who was a heavy smoker, passed his enormous cigarette case round the table. Smoking before a superior officer, if one was a smoker, was the normal practice in Hultsdorp. The Civil Servants never did it. For example, a Class 11 man never smoked in the presence of a Class I officer, and a Class I Officer would not have dared to smoke in the presence of the Chief Secretary.
This struck me forcibly during a conference at the Secretariat in wartime. Drayton, who was in the Colonial Legal Service had been transferred as Chief Secretary, a rather unusual appointment for a lawyer and a draftsman, and had been succeeded by Nihill. The Conference was about the territorial waters of Ceylon and was attended by Nihill and myself, top army, navy and air force officers and top civil servants. Drayton presided. Sir Robert had, at that time, given up smoking as he had some trouble in his throat. Nihill was a smoker but never appeared to have his own cigarettes.
After some time, I asked Drayton whether I had his permission to smoke, permission which was readily granted with apologies that he was sorry that he had none to offer. I lit up and Nihill promptly borrowed one from me and continued to do so during the conference. Not one Civil Servant smoked while he Chief Secretary was in the Chair. As we left the conference room one of the Civil Servants offered me a cigarette and lit one himself.
C. L. Wickremesinghe, then Land Commissioner and a Class I Civil Servant came one day to see Mervyn Fonseka over some draft legislation. Mervyn asked Harry Wendt, an Assistant, to come with the relevant file and Harry came with the file and his tin of cigarettes and, during the ensuing discussion, kept puffing away as he was a heavy smoker. It was a shock to the senior Civil Servant to learn that in Hultsdorp, an assistant was permitted to smoke in the presence of his Head, nay, that he indulged in this practice almost as a matter of right.
On another occasion when Percy de Silva, another assistant, was sent for when another very senior Civil Servant was present, he came with his cigarettes and matches, his pipe and his tin of tobacco and placed them all on the boss’s table. The news soon spread in Civil Service circles, of the utter indiscipline and disrespect for seniority prevailing in Hultsdorp.
In 1924, with the appointment of E. G. P. Jayatilleka to the Bench, the post of Attorney-General fell vacant. Governor Caldecott offered the vacancy to Mervyn. At this time, M. W. H. de Silva, a good friend of Mervyn’s and the older of the two, was Solicitor-General. M. W. H. told Mervyn that if he accepted, he would be appointed, and would thereby, by reason of age and precedence, shut M.W.H. out of future promotions. He requested Mervyn to stand down, which he did.
He informed the Governor that he was willing to accept the post of Solicitor-General under M. W. H. as Attorney – General Mervyn showed me the letter written to him by Caldecott in his own hand informing him that he would be appointed Solicitor-General (“under protest” underlined three times and followed by three exclamation marks). I am not aware of any other case in the public service where one man has stood down for another, on grounds of age and friendship, in the matter of appointment to such high office.
Mervyn was accordingly appointed Solicitor-General and took silk. He had been admitted as an advocate in 1928 and, five years later, was appointed Legal Draftsman. His knowledge of the law and devotion to duty were so greatly appreciated that he was appointed to act as Legal Secretary when Drayton moved over as Chief Secretary. He died in 1946 at the early age of forty-nine.
His Excellency the Governor made the following minute:
“His Excellency the Governor desires to place on record his deep regret at the death of Mr J. Mervyn Fonseka, OBE., K.C., Solicitor-General. Mr Fonseka’s services under the Ceylon Government extended over a period of 19 years and was characterized by able and conscientious devotion to duty. At the time of his death, he held the highly important office of Solicitor-General in the Island of Ceylon and had performed the duties of that office with marked ability. His death is deplored by his colleagues and by his numerous friends throughout the Island.”
In the Supreme Court, tributes were paid to him. Basnayake, the Attorney-General, addressing the Judges, said that Mr Fonseka’s early death had removed from their ranks an outstanding personality and created a void which could not be filled. Like many distinguished members of the Bar, Mr Fonseka had shown great promise both in his academic and professional studies. There was no prize which was worthy, no distinction which was coveted, that he did not win for himself. The profession of teaching attracted him first, but that was only for a time till he qualified for the Bar with its glittering rewards.
Early in his professional career, he entered the service of the Crown. His rise was rapid. He successfully held the offices of Crown. Counsel, Assistant to the Attorney-General, Assistant Legal Draftsman, Legal Draftsman, Acting Legal Secretary, Solicitor-General and Acting Attorney-General. Had death not intervened, and so suddenly and so early removed him, he would undoubtedly have attained the highest judicial office in the Island.
The Attorney-General continued: Mr Fonseka had a lofty sense of duty and intense loyalty. His burning zeal for work was the despair of his colleagues who strained every nerve at times to keep pace with him. In the field of drafting, he excelled. The care with which draft legislation was prepared, the precision and perfection of his work, were known to every legislator since the reforms. He organized and reared a new department, the destinies of which he guided for eight years.
Those eight years were the busiest and most strenuous of the 24 of his professional life. He had made a worthy and lasting contribution to legislative drafting in this Island. Not only had he improved the standard and style of Ceylon enactments but he had also trained a band of brilliant young men in the technique of legislative drafting. His work in that sphere would remain a monument to him more permanent than marble or bronze.
In the period of the war, he toiled night and day to meet the imperious demands for urgently needed legislation. Although His Majesty did not fail to recognize his work, the stress of labours made itself felt and, since 1943, each succeeding year indicated that he had over-strained his constitution. Mr Fonseka’s outside interests had a wide and varied range. Music, literature, the classics, radio, chronometers were but a few. His love for music was great and his home became the Mecca of music-lovers. Mervyn Fonseka is no more, but the high ideals which he cherished and practised will serve as an inspiration for generations to come.
Sir John Howard, Chief Justice replied: Mr Fonseka’s record of achievements spoke for itself. He had a wide and extensive knowledge of every branch and every system of law. In the application of that knowledge, he did not adopt any ultra legalistic pedantry, but brought to bear a common sense point of view. Apart from Mr Fonseka’s legal knowledge, he was a brilliant scholar and a very well-read man.
It was sad to reflect at a time like this, when Ceylon was about to embark on a new order, that by Mervyn’s death, she would be deprived of one of her most brilliant sons at an early age and one so well fitted to guide her future destinies.
At a time like this, when Mervyn has passed to the other side, I prefer myself to dwell not so much on his record of achievements but on Mervyn as a colleague and a friend. For several years I was associated with him when I was Legal Draftsman. During that time, I incurred a debt of gratitude which can never be paid. He was a most loyal and devoted colleague. I think myself, that if he had devoted a little less time to his work, if he had been a less devoted public servant and given more care to his physical health, it is possible that he would have been with us today and going on from height to height till he reached that pinnacle to which the legal people can rise in Ceylon.
All his Assistants loved him and we carried the coffin to his grave. It would be impertinence on my part to add to what the Attorney-General and the Chief Justice said. Suffice it to say that if I have been efficient as a public servant, my efficiency has been due to the very thorough training I received under Choksy and Mervyn. He will always be in my memory.
Features
Retirement age for judges: Innovation and policy
I. The Constitutional Context
Independence of the judiciary is, without question, an essential element of a functioning democracy. In recognition of this, ample provision is made in the highest law of our country, the Constitution, to engender an environment in which the courts are able to fulfil their public responsibility with total acceptance.
As part of this protective apparatus, judges of the Supreme Court and the Court of Appeal are assured of security of tenure by the provision that “they shall not be removed except by an order of the President made after an address of Parliament supported by a majority of the total number of members of Parliament, (including those not present), has been presented to the President for such removal on the ground of proved misbehaviour or incapacity”[Article 107(2)]. Since this assurance holds good for the entirety of tenure, it follows that the age of retirement should be defined with certainty. This is done by the Constitution itself by the provision that “the age of retirement of judges of the Supreme Court shall be 65 years and of judges of the Court of Appeal shall be 63 years”[Article 107(5)].
II. A Proposal for Reform
This provision has been in force ever since the commencement of the Constitution. Significant public interest, therefore, has been aroused by the lead story in a newspaper, Anidda of 13 March, that the government is proposing to extend the term of office of judges of the Supreme Court and the Court of Appeal by a period of two years.
This proposal, if indeed it reflects the thinking of the government, is deeply disturbing from the standpoint of policy, and gives rise to grave consequences. The courts operating at the apex of the judicial structure are called upon to do justice between citizens and also between the state and members of the public. It is an indispensable principle governing the administration of justice that not the slightest shadow of doubt should arise in the public mind regarding the absolute objectivity and impartiality with which the courts approach this task.
What is proposed, if the newspaper report is authentic, is to confer on judges of two particular courts, the Supreme Court and the Court of Appeal, a substantial benefit or advantage in the form of extension of their years of service. The question is whether the implications of this initiative are healthy for the administration of justice.
III. Governing Considerations of Policy
What is at stake is a principle intuitively identified as a pillar of justice.
Reflecting firm convictions, the legal antecedents reiterate the established position with remarkable emphasis. The classical exposition of the seminal standard is, of course, the pronouncement by Lord Hewart: “It is not merely of some importance, but is of fundamental importance that justice should not only be done, but should manifestly and undoubtedly be seen to be done”. (Rex v. Sussex Justices, ex parte McCarthy). The underlying principle is that perception is no less important than reality. The mere appearance of partiality has been held to vitiate proceedings: Dissanayake v. Kaleel. In particular, reasonableness of apprehension in the mind of the parties to litigation is critical: Ranjit Thakur v. Union of India, a reasonable likelihood of bias being necessarily fatal (Manak Lal v. Prem Chaud Singhvi).
The overriding factor is unshaken public confidence in the judiciary: State of West Bengal v. Shivananda Pathak. The decision must be “demonstrably” (Saleem Marsoof J.) fair. The Bar Association of Sri Lanka has rightly declared: “The authority of the judiciary ultimately depends on the trust reposed in it by the people, which is sustained only when justice is administered in a visibly fair manner”.
Credibility is paramount in this regard. “Justice has to be seen to be believed” (J.B. Morton). Legality of the outcome is not decisive; process is of equal consequence. Judicial decisions, then, must withstand public scrutiny, not merely legal technicality: Mark Fernando J. in the Jana Ghosha case. Conceived as continuing vitality of natural justice principles, these are integral to justice itself: Samarawickrema J. in Fernando v. Attorney General. Institutional integrity depends on eliminating even the appearance of partiality (Mandal Vikas Nigam Ltd. v. Girja Shankar Pant), and “open justice is the cornerstone of our judicial system”: (Sahara India Real Estate Corporation Ltd. v. SEBI).
IV. Practical Constraints
Apart from these compelling considerations of policy, there are practical aspects which call for serious consideration. The effect of the proposal is that, among all judges operating at different levels in the judicature of Sri Lanka, judges of the Supreme Court and the Court of Appeal only, to the exclusion of all other judges, are singled out as the beneficiaries of the proposal. An inevitable result is that High Court and District Judges and Magistrates will find their avenues of promotion seriously impeded by the unexpected lengthening of the periods of service of currently serving judges in the two apex courts. Consequently, they will be required to retire at a point of time appreciably earlier than they had anticipated to relinquish judicial office because the prospect of promotion to higher courts, entailing higher age limits for retirement, is precipitately withdrawn. Some degree of demotivation, arising from denial of legitimate expectation, is therefore to be expected.
A possible response to this obvious problem is a decision to make the two-year extension applicable to all judicial officers, rather than confining it to judges of the two highest courts. This would solve the problem of disillusionment at lower levels of the judiciary, but other issues, clearly serious in their impact, will naturally arise.
Public service structures, to be equitable and effective, must be founded on principles of non-discrimination in respect of service conditions and related matters. Arbitrary or invidious treatment is destructive of this purpose. In determining the age of retirement of judges of the Supreme Court and the Court of Appeal, some attention has been properly paid to balance and consistency. The age of retirement of a Supreme Court judge is on par with that applicable to university professors and academic staff in the higher education system. They all retire at 65 years. Members of the public service, generally, retire at 60. Medical specialists retire at 63, with the possibility of extension in special circumstances to 65. The age of retirement for High Court Judges is 61, and for Magistrates and District Judges 60. It may be noted that the policy change in 2022 aimed at specifically addressing the issue of uniformity and compatibility.
If, then, an attempt is made to carve out an ad hoc principle strictly limited to judicial officers, not admitting of a self-evident rationale, the question would inevitably arise whether this is fair by other categories of the public service and whether the latter would not entertain a justifiable sense of grievance.
This is not merely a moral or ethical issue relating to motivation and fulfillment within the public service, but it could potentially give rise to critical legal issues. It is certainly arguable that the proposed course of action represents an infringement of the postulate of equality of treatment, and non-discrimination, enshrined in Article 12(1) of the Constitution.
There would, as well, be the awkward situation that this issue, almost certain to be raised, would then have to be adjudicated upon by the Supreme Court, itself the direct and exclusive beneficiary of the impugned measure.
V. Piecemeal Amendment or an Overall Approach?
If innovation on these lines is contemplated, would it not be desirable to take up the issue as part of the new Constitution, which the government has pledged to formulate and enact, rather than as a piecemeal amendment at this moment to the existing Constitution? After all, Chapter XV, dealing with the Judiciary, contains provisions interlinked with other salient features of the Constitution, and an integrated approach would seem preferable.
VI. Conclusion
In sum, then, it is submitted that the proposed change is injurious to the institutional integrity of the judiciary and to the prestige and stature of judges, and that it should not be implemented without full consideration of all the issues involved.
By Professor G. L. Peiris
D. Phil. (Oxford), Ph. D. (Sri Lanka);
Former Minister of Justice, Constitutional Affairs and National Integration;
Quondam Visiting Fellow of the Universities of Oxford, Cambridge and London;
Former Vice-Chancellor and Emeritus Professor of Law of the University of Colombo.
Features
Ranked 134th in Happiness: Rethinking Sri Lanka’s development through happiness, youth wellbeing and resilience
In recent years, Sri Lanka has experienced a succession of overlapping challenges that have tested its resilience. Cyclone Ditwah struck Sri Lanka in November last year, significantly disrupting the normal lives of its citizens. The infrastructure damage is much more serious than the tsunami. According to World Bank reports and preliminary estimates, the losses amounted to approximately US$ 4.1 billion, nearly 4 per cent of the country’s Gross Domestic Product. Before taking a break from that, the emerging crisis in the Middle East has once again raised concerns about potential economic repercussions. In particular, those already affected by disasters such as Cyclone Ditwah risk falling “from the frying pan into the fire,” facing multiple hardships simultaneously. Currently, we see fuel prices rising, four-day workweeks, a higher cost of living, increased pressure on household incomes, and a reduction in the overall standard of living for ordinary citizens. It would certainly affect people’s happiness. As human beings, we naturally aspire to live happy and fulfilling lives. At a time when the world is increasingly talking about happiness and wellbeing, the World Happiness Report provides a useful way of looking at how countries are doing. The World Happiness Report discusses global well-being and offers strategies to improve it. The report is produced annually with contributions from the University of Oxford’s Wellbeing Research Centre, Gallup, the UN Sustainable Development Solutions Network, and other stakeholders. There are many variables taken into consideration for the index, including the core measure (Cantril Ladder) and six explanatory variables (GDP per Capita ,Social Support,Healthy Life Expectancy,Freedom to Make Life Choices,Generosity,Perceptions of Corruption), with a final comparison.
According to the recently published World Happiness Report 2026, Sri Lanka ranks 134th out of 147 nations. As per the report, this is the first time that Sri Lanka has suffered such a decline. Sri Lanka currently trails behind most of its South Asian neighbours in the happiness index. The World Happiness Report 2026 attributes Sri Lanka’s low ranking (134th) to a combination of persistent economic struggles, social challenges, and modern pressures on younger generations. The 2026 report specifically noted that excessive social media use is a growing factor contributing to declining life satisfaction among young people globally, including in Sri Lanka. This calls for greater vigilance and careful reflection. These concerns should be examined alongside key observations, particularly in the context of education reforms in Sri Lanka, which must look beyond their immediate scope and engage more meaningfully with the country’s future.
In recent years, a series of events has triggered political upheaval in countries such as Nepal, characterised by widespread protests, government collapse, and the emergence of interim administration. Most reports and news outlets described this as “Gen Z protests.” First, we need to understand what Generation Z is and its key attributes. Born between 1997 and 2012, Generation Z represents the first truly “digital native” generation—raised not just with the internet, but immersed in it. Their lives revolve around digital ecosystems: TikTok sets cultural trends, Instagram fuels discovery, YouTube delivers learning, and WhatsApp sustains peer communities. This constant, feed-driven engagement shapes not only how they consume content but how they think, act, and spend. Tech-savvy and socially aware, Gen Z holds brands to a higher standard. For them, authenticity, transparency, and accountability—especially on environmental and ethical issues—aren’t marketing tools; they’re baseline expectations. We can also observe instances of them becoming unnecessarily arrogant in making quick decisions and becoming tools of some harmful anti-social ideological groups. However, we must understand that any generation should have proper education about certain aspects of the normal world, such as respecting others, listening to others, and living well. More interestingly, a global survey by the McKinsey Health Institute, covering 42,083 people across 26 countries, finds that Gen Z reports poorer mental health than older cohorts and is more likely to perceive social media as harmful.
Youth health behaviour in Sri Lanka reveals growing concerns in mental health and wellbeing. Around 18% of youth (here, school-going adolescents aged 13-17) experience depression, 22.4% feel lonely, and 11.9% struggle with sleep due to worry, with issues rising alongside digital exposure. Suicide-related risks are significant, with notable proportions reporting thoughts, plans, and attempts, particularly among females. Bullying remains a significant concern, particularly among males, with cyberbullying emerging as a notable issue. At the same time, substance use is increasing, including tobacco, smokeless tobacco, and e-cigarettes. These trends highlight the urgent need for targeted interventions to support youth mental health, resilience, and healthier behavioural outcomes in Sri Lanka. We need to create a forum in Sri Lanka to keep young people informed about this. Sri Lanka can designate a date (like April 25th) as a National Youth Empowerment Day to strengthen youth mental health and suicide prevention efforts. This should be supported by a comprehensive, multi-sectoral strategy aligned with basic global guidelines. Key priorities include school-based emotional learning, counselling services, and mental health training for teachers and parents. Strengthening data systems, reducing access to harmful means, and promoting responsible media reporting are essential. Empowering families and communities through awareness and digital tools will ensure this day becomes a meaningful national call to action.
As discussed earlier, Sri Lanka must carefully understand and respond to the challenges arising from its ongoing changes. Sri Lanka should establish an immediate task force comprising responsible stakeholders to engage in discussions on ongoing concerns. Recognising that it is not a comprehensive solution, the World Happiness Index can nevertheless act as an important indicator in guiding a paradigm shift in how we approach education and economic development. For a country seeking to reposition itself globally, Sri Lanka must adopt stronger, more effective strategies across multiple sectors. Building a resilient and prosperous future requires sound policymaking and clear strategic direction.
(The writer is a Professor in Management Studies at the Open University of Sri Lanka. You can reach Professor Abeysekera via nabey@ou.ac.lk)
by Prof. Nalin Abeysekera
Features
Hidden diversity in Sri Lanka’s killifish revealed: New study reshapes understanding of island’s freshwater biodiversity
A groundbreaking new study led by an international team of scientists, including Sri Lankan researcher Tharindu Ranasinghe, has uncovered striking genetic distinctions in two closely related killifish species—reshaping long-standing assumptions about freshwater biodiversity shared between Sri Lanka and India.
Published recently in Zootaxa, the research brings together leading ichthyologists such as Hiranya Sudasinghe, Madhava Meegaskumbura, Neelesh Dahanukar and Rajeev Raghavan, alongside other regional experts, highlighting a growing South Asian collaboration in biodiversity science.
For decades, scientists debated whether Aplocheilus blockii and Aplocheilus parvus were in fact the same species. But the new genetic analysis confirms they are “distinct, reciprocally monophyletic sister species,” providing long-awaited clarity to their taxonomic identity.
Speaking to The Island, Ranasinghe said the findings underscore the hidden complexity of Sri Lanka’s freshwater ecosystems.
“What appears superficially similar can be genetically very different,” he noted. “Our study shows that even widespread, common-looking species can hold deep evolutionary histories that we are only now beginning to understand.”
A tale of two fishes
The study reveals that Aplocheilus blockii is restricted to peninsular India, while Aplocheilus parvus occurs both in southern India and across Sri Lanka’s lowland wetlands.
Despite their close relationship, the two species show clear genetic separation, with a measurable “genetic gap” distinguishing them. Subtle physical differences—such as the pattern of iridescent scales—also help scientists tell them apart.
Co-author Sudasinghe, who has led several landmark studies on Sri Lankan freshwater fishes, noted that such integrative approaches combining genetics and morphology are redefining taxonomy in the region.
Echoes of ancient land bridges
The findings also shed light on the ancient biogeographic links between Sri Lanka and India.
Scientists believe that during periods of low sea levels in the past, the two landmasses were connected by the now-submerged Palk Isthmus, allowing freshwater species to move between them.
Later, rising seas severed this connection, isolating populations and driving genetic divergence.
“These fishes likely dispersed between India and Sri Lanka when the land bridge existed,” Ranasinghe said. “Subsequent isolation has resulted in the patterns of genetic structure we see today.”
Meegaskumbura emphasised that such patterns are increasingly being observed across multiple freshwater fish groups in Sri Lanka, pointing to a shared evolutionary history shaped by geography and climate.
A deeper genetic divide
One of the study’s most striking findings is that Sri Lankan populations of A. parvus are genetically distinct from those in India, with no shared haplotypes between the two regions.
Dahanukar explained that this level of differentiation, despite relatively recent geological separation, highlights how quickly freshwater species can diverge when isolated.
Meanwhile, Raghavan pointed out that these findings reinforce the importance of conserving habitats across both countries, as each region harbours unique genetic diversity.
Implications for conservation
The study carries important implications for conservation, particularly in a country like Sri Lanka where freshwater ecosystems are under increasing pressure from development, pollution, and climate change.
Ranasinghe stressed that understanding genetic diversity is key to protecting species effectively.
“If we treat all populations as identical, we risk losing unique genetic lineages,” he warned. “Conservation planning must recognise these hidden differences.”
Sri Lanka is already recognised as a global biodiversity hotspot, but studies like this suggest that its biological richness may be even greater than previously thought.
A broader scientific shift
The research also contributes to a growing body of work by scientists such as Sudasinghe and Meegaskumbura, challenging traditional assumptions about species distributions in the region.
Earlier studies often assumed that many freshwater fish species were shared uniformly between India and Sri Lanka. However, modern genetic tools are revealing a far more complex picture—one shaped by ancient geography, climatic shifts, and evolutionary processes.
“We are moving from a simplistic view of biodiversity to a much more nuanced understanding,” Ranasinghe said. “And Sri Lanka is proving to be a fascinating natural laboratory for this kind of research.”
Looking ahead
The researchers emphasise that much remains to be explored, with several freshwater fish groups in Sri Lanka still poorly understood at the genetic level.
For Sri Lanka, the message is clear: beneath its rivers, tanks, and wetlands lies a largely untapped reservoir of evolutionary history.
As Ranasinghe puts it:
“Every stream could hold a story of millions of years in the making. We are only just beginning to read them.”
By Ifham Nizam
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