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Researchers discover new variant of Sri Lankan aquarium fish

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by Ifham Nizam

A new variant of a popular Sri Lankan aquarium fish has been discovered by local and foreign researchers.

The freshwater fish, genus Rasbora, (commonly called ‘dandiya’) is one of the most diverse groups of freshwater fishes in tropical Asia.

In Sri Lanka, previous studies have shown that there are five species (Rasbora dandia, R. microcephalus, R. wilpita, R. naggsi, and R. armitagei) of which the last three are endemic to the island. This diversity is remarkable when compared with peninsular India, which is about 25 times the size of Sri Lanka but contain only four species of Rasbora.

Biologists earlier believed there were only five varieties of the popular aquarium fish endemic to Sri Lanka. However, with the discovery of the sixth species, Rasbora has gained a new reputation among Sri Lankan freshwater fish breeders, hobbyists and harvesters.

The researchers carried out multiple analysis using “finer geographic sampling and greater sample sizes”, thereby corroborating the validity of six species of Rasbora (scientifically called as ‘Cyprinidae’) in Sri Lanka.

The team of researchers have combed a sampling of 90 sites across Sri Lanka to identify the new species. The team consisting of Hiranya Sudasinghe of Evolutionary Ecology and Systematics Lab, Department of Molecular Biology and Biotechnology, University of Peradeniya, Rohan Pethiyagoda of Ichthyology Section, Australian Museum, Sydney, NSW, Australia, Ranasinghe Hettiarachchige Tharindu Ranasinghe of Butterfly Conservation Society of Sri Lanka, Malwana, Rajeev Raghavan of Department of Fisheries Resource Management, Kerala University of Fisheries and Ocean Studies (KUFOS), Kochi, India, Neelesh Dahanukar of Indian Institute of Science Education and Research (IISER), Pune, India and Madhava Meegaskumbura of Guangxi Key Laboratory of Forest Ecology & Conservation, College of Forestry, Guangxi University, Nanning, China.

Sudasinghe told The Sunday Island that more extensive sampling of Rasbora in India, and analysis based on multiple markers may reveal “a more complex phylogenetic topology” (diversity).

“The Sri Lankan diversification derives from a common ancestor which arrived from India during a sea-level low-stand in the mid-Miocene (15.1 Ma [95% HPD: 11.5–19.8 Ma]), when the present-day island was sub aerially connected to the Indian subcontinent by a broad isthmus”, he added.

Rasbora is generally believed to have arrived in the island from the Indian sub-continent centuries ago when Sri Lanka stood geographically merged with India.  In the latest study, researchers confirm this belief.

“Our analysis suggest that Sri Lankan Rasbora derive from a Mid Miocene, India to Sri Lanka dispersal”, he noted, and added that Sri Lankan Rasbora diversity is higher than that of the Indian peninsula.

The Sri Lankan diversity of Rasbora provides an opportunity to understand the evolutionary and phylogenetic relationships of freshwater fishes in the island. Understanding the bio geography, phylogenetic and the evolutionary relationships of species are pivotal in formulating effective assessments of the conservation status of species as well as to draw up species conservation management plans.

However, such studies are still at very early stages when it comes to the freshwater fishes in Sri Lanka.

The first-ever molecular phylogeny of Sri Lankan Rasbora and reassess the taxonomic identities of the five species of Sri Lankan Rasbora based on an island-wide survey. In this study, based on molecular, morphological and statistical analyses using finer geographic sampling, validate the five putative species of Rasbora previously recognized in Sri Lanka.

In addition, a new species of Rasbora was discovered from eastern Sri Lanka. This new species was named Rasbora adisi. The species name “adisi” means mysterious or enigmatic in Sinhala: an allusion to the cryptic nature of this species.

The new species is found in eastern basins in Sri Lanka such as Gal Oya, Menik River and Kumbukkan River and show the closest resemblance to Rasbora naggsi. However, the new species is different from R. naggsi by a combination of morphological characters in addition to been genetically distinct.

 



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Tri-Forces donate LKR. 372 million, a day’s pay of all ranks to ‘Rebuilding Sri Lanka’ Fund

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Members of all ranks from the Sri Lanka Army, Sri Lanka Navy and Sri Lanka Air Force have collectively donated a day’s basic salary to the ‘Rebuilding Sri Lanka’ Fund, which was established to restore livelihoods and rebuild the country following the devastation caused by Cyclone Ditwah.

Accordingly, the total contribution made by the Tri-Forces amounts to LKR. 372,776,918.28.

The cheques representing the financial contributions were handed over on Wednesday (31 December) at the Presidential Secretariat to the Secretary to the President, Dr. Nandika Sanath Kumanayake.

The donations comprised LKR. 250 million from the Commander of the Army, Major General Lasantha Rodrigo; LKR. 73,963,879.71 from the Commander of the Navy, Rear Admiral Kanchana Banagoda and LKR. 48,813,038.97 from the Commander of the Air Force, Air Marshal Vasu Bandu Edirisinghe.

Secretary to the Ministry of Defence, Air Vice Marshal Sampath Thuyacontha, was also present on the occasion.

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CEB demands 11.57 percent power tariff hike in first quarter

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The Ceylon Electricity Board (CEB) has submitted a proposal to the Public Utilities Commission of Sri Lanka (PUCSL) seeking an 11.57 percent increase in electricity tariffs for the first quarter of 2026, citing an estimated revenue shortfall and additional financial pressures, including cyclone-related damages.

According to documents issued by the PUCSL, the proposed tariff revision would apply to electricity consumption from January to March 2026 and includes changes to both energy charges and fixed monthly charges across all consumer categories, including domestic, religious, industrial, commercial and other users.

Under the proposal, domestic electricity consumers would face increases in unit rates as well as fixed monthly charges across all consumption blocks.

The CEB has estimated a deficit of Rs. 13,094 million for the first quarter of 2026, which it says necessitates the proposed 11.57 per cent tariff hike. The utility has noted that any deviation from this estimate whether a surplus or a shortfall will be adjusted through the Bulk Supply Tariff Adjustment (BSTA) mechanism and taken into account in the next tariff revision.

In its submission, the CEB said the proposed revision is aimed at ensuring the financial and operational stability of the power sector and mitigating potential risks to the reliability of electricity supply. The board-approved tariff structure for the first quarter of 2026 has been submitted to the PUCSL for approval and subsequent implementation, as outlined in Annex II of the proposal.

The CEB has also highlighted the financial impact of Cyclone Ditwah, which it said caused extensive damage to electricity infrastructure, with total losses estimated at around Rs. 20 billion. Of this amount, Rs. 7,016.52 million has been attributed to the first quarter of 2026, which the utility said has a direct bearing on electricity tariffs.

The CEB warned that if external funding is not secured to cover the cyclone-related expenditure, the costs incurred would need to be recovered through electricity tariffs in the second-quarter revision of 2026.

Meanwhile, the PUCSL has said that a decision on whether to approve the proposed tariff increase will be made only after following due regulatory procedures and holding discussions on the matter.

By Sujeewa Thathsara ✍️

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Health Minister sends letter of demand for one billion rupees in damages

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Ondansetron controversy

Minister of Health and Mass Media Dr Nalinda Jayatissa has sent a letter of demand for Rs. 1 billion in damages from YouTube content creator Dharmasri Kariyawasam, accusing him of disseminating false and defamatory material linking the Minister to the importation of Ondansetron and inciting public unrest.

The notice, sent through the Minister’s lawyers, states that investigations are currently under way into 10 medicines, including Ondansetron Injection, manufactured by India-based Maan Pharmaceutical Limited.

Ondansetron Injection was among nine injectable drugs recently suspended by the National Medicines Regulatory Authority (NMRA) following reports of patients administered with the drug suffering adverse complications.

Despite the ongoing investigations, Kariyawasam allegedly aired a widely viewed programme on his YouTube channel titled “The hidden story of the Indian drug that claimed lives, Mayor Balthazaar’s relative, and Minister Nalinda’s cover-up.”

According to the letter of demand, the programme falsely portrayed Minister Jayatissa as being directly responsible for importing the drug, colluding with the supplier, and attempting to conceal the issue, while depicting him as indifferent to public suffering.

The Minister’s lawyers maintain that these allegations are entirely false and defamatory, citing passages in which Kariyawasam allegedly accused Jayatissa of lying about the supplier, concealing facts related to PTC Medicals (Pvt) Ltd., the actual importer, and showing a lack of concern over deaths purportedly linked to the drug.

The programme also claimed links between the directors of PTC Medicals and family members of Colombo Mayor Vraîe Cally Balthazaar, implying political favouritism.

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