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Researchers discover new variant of Sri Lankan aquarium fish
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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Advisory for severe lightning for the Western and Sabaragamuwa provinces and Galle and Matara districts
Advisory for Severe Lightning Issued by the Natural Hazards Early Warning Centre at 12.15 p.m. 06 December 2025 valid for the period until 11.00 p.m. 06 December 2025.
The public are being cautioned that thundershowers accompanied with severe lightning are likely to occur at some places in the Western and Sabaragamuwa provinces and in Galle and Matara districts.
There may be temporary localized strong winds during thundershowers.
The General public is kindly requested to take adequate precautions to minimize damages caused by lightning activity.
ACTION REQUIRED:
The Department of Meteorology advises that people should:
Seek shelter, preferably indoors and never under trees.
Avoid open areas such as paddy fields, tea plantations and open water bodies during thunderstorms.
Avoid using wired telephones and connected electric appliances during thunderstorms.
Avoid using open vehicles, such as bicycles, tractors and boats etc.
Beware of fallen trees and power lines.
For emergency assistance contact the local disaster management authorities.
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Government briefs Diplomatic Community on recovery progress
A special briefing for the diplomatic community in Sri Lanka was held on 4 December at the Ministry of Foreign Affairs, Foreign Employment and Tourism, chaired by Prime Minister Dr. Harini Amarasuriya together with the Minister of Foreign Affairs, Foreign Employment and Tourism, Vijitha Herath. Senior government officials, including representatives of the Disaster Management Centre (DMC) and the Sri Lanka Tourism Development Authority (SLTDA), also participated.
Opening the session, Prime Minister Dr. Harini Amarasuriya expressed her gratitude to the diplomatic community for their immediate support and solidarity following the recent floods and landslides. She noted that Sri Lanka had endured one of the most severe disasters in recent years, but the resilience of the people and the coordinated efforts of government agencies had enabled a rapid response and significant progress in relief operations. She confirmed that not a single tourist has been reported harmed during the disaster and noted that the previously inaccessible areas are now reachable. Massive cleanup and decontamination operations are underway to ensure that lands and public spaces are safe for return, and communications have been restored in the affected areas.
The Prime Minister emphasized that relief, evacuation, and emergency assistance were carried out with the collective effort of the tri-forces, police, public officers, health workers, volunteers, and local authorities. She acknowledged the continuing challenges, including the restoration of infrastructure, resettlement needs, and long-term disaster-mitigation work, and welcomed the technical, humanitarian, and financial support offered by partner countries.
Maj. Gen. Sampath Kotuwegoda (Retd), Director General of the Disaster Management Centre, delivered a detailed presentation on the current status of the disaster, including the number of affected families, evacuation centres, damage assessments, and the ongoing coordination with international agencies for recovery planning. The cyclone affected almost the entire country, with 22 districts severely impacted. Some locations recorded up to 540 mm of rainfall and winds of up to 70 km/h, causing widespread infrastructure damage. Early assessments indicate that 2.3 million people were exposed to flooding, with 1.8 million people directly affected on the ground and 1.1 million hectares of land impacted. The assessment also identified 40,152 pregnant women among those affected, who have been prioritized for support. He also highlighted areas where further technical cooperation, such as early-warning systems, mapping capabilities, and climate-response technologies would be valuable.
Buddhika Hewawasam, Chairman of the Sri Lanka Tourism Development Authority, briefed the diplomatic community on the impact of the disaster on the tourism sector. He reassured attendees that major tourism zones remain operational, safety assessments are underway, and contingency measures have been activated to support visitors and protect the industry during the upcoming peak season. The Chairman of the Hotel Association of Sri Lanka Ashoka Hettigoda confirmed that the Coastal and resort hotels from Maravila to Passikudah are operating, with many reporting 60–65 percent occupancy; the hotels in Nuwara Eliya are partially operational. He made an appeal that the best assistance that the international community can give to Sri Lanka is the continued support provided through tourism.
Several diplomats conveyed their condolences to affected communities and reaffirmed their governments’ readiness to assist Sri Lanka in both immediate relief efforts and long-term rebuilding. They expressed appreciation for the government’s transparent engagement and the coordinated approach to managing the crisis.
Prime Minister thanked the diplomats for their continued cooperation and underscored the government’s commitment to ensuring an effective and inclusive recovery. She stressed that strengthening disaster preparedness, climate resilience, and institutional capacity will be central to Sri Lanka’s national development agenda moving forward. Deputy Minister of Foreign Affairs, Foreign Employment and Tourism, Arun Hemachandra, Secretary to the Prime Minister, Pradeep Saputhanthri, and Secretary to the Ministry of Foreign Affairs, Ms. Aruni Ranaraja, also attended the meeting.


[Prime Minister’s Media Division]
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All parties have agreed to recruit Development Officers into the teaching service through a competitive examination – PM
Addressing Parliament on Friday (05), the Prime Minister stated that, in accordance with the Supreme Court decision, the recommendations issued by the Public Service Commission, and the Sri Lanka Teachers’ Service Minute, all parties have agreed to recruit teachers through a competitive examination. The Prime Minister further noted that during the second phase of the recruitment process, the Development Officers currently serving in schools will be given preference during the interviews.
Addressing further, the Prime Minister stated,
“In compliance with the final order of the Supreme Court and the provisions of the Sri Lanka Teachers’ Service Minute, the Development Officers will be given the opportunity to join the Sri Lanka Teachers’ Service.
It has been decided to revise the maximum age limit of 40 years, as specified in the examination notification for applicants, to 45 years for this instance only”.
The Prime Minister further stated that, in accordance with the Supreme Court decision, arrangements have been taken to revise the age limits for graduates employed in the public service and graduates not employed in the public service, and to conduct separate examinations accordingly, in order to recruit teachers to Grade 3. i (a) of the Teachers’ Service to fill the available vacancies.
[Prime Minister’s Media Division]
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