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Blue whale population in Lankan waters shows rapid decline

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Whale-watching tours, when done irresponsibly, can cause stress to these gentle giants. (Mongabay Pic)

The blue whale population that has lived for many years in the coastal waters of Sri Lanka, has shown a rapid decline in their sightings in recent years, said a report published by the Mongabay yesterday.

“With multiple pressures on these massive creatures — from ship traffic on one of the world’s busiest shipping lanes, to disturbance from whale tourism, pollution and surface sea temperature rise and climate change — there are several possible factors for the disappearance of the whales,” it said.

For decades, the North Indian Ocean has been known to have its own distinct population of blue whales (Balaenoptera musculus). They have their own vocalisation or dialect, distinct from other blue whale populations. They also spend all year in warm waters, unlike most other blue whales, who migrate to feed in cold waters and breed in warmer seas, says Asha de Vos, a marine biologist and founder of Oceanswell, a marine conservation research and education center in Sri Lanka.

De Vos told Mongabay that the North Indian Ocean blue whales are “grazers not gorgers,” feeding throughout the year. The coasts of Sri Lanka, and particularly the southwest coast between Galle and Dondra, has long been a hotspot for this resident population.

Ranil Nanayakkara is a conservation biologist specialising in terrestrial and marine mammals and founder of Biodiversity Education and Research (BEAR). Both de Vos and Nanayakkara have studied these whales the year around — feeding, mothers nursing calves, and courtship behaviour — the whole life cycle playing out within 20 kilometers (12 miles) of the Sri Lankan coast.

Deep waters close to the coast and upwelling currents from sea canyons have created conditions supporting phytoplankton, and in turn, zooplankton and shrimp, the ocean’s tiniest creatures that sustain its biggest. “In terms of weight it could eat a fully grown African elephant every day,” author and biologist Mark Carwardine wrote of Sri Lanka’s blue whales in his On the Trail of the Whale.

However, it’s not easy to estimate blue whale numbers around Sri Lanka with certainty. A 2023 study by Upul Liyanage from the Sri Lankan National Aquatic Resources and Research Development Agency (NARA) and others noted 729 blue whale sightings, with many of the same whales likely observed multiple times. Nanayakkara’s research has identified 81 different blue whales from their distinctive tail fluke patterns. Meanwhile, Oceanswell is carrying out a database analysis.

The population and consistency of blue whales has given birth to a thriving whale-watching industry in the eastern city of Trincomalee, Kalpitiya in the northwest, and, most prominently, in Mirissa, in the south. One published study estimated nearly 80,000 visitors to Sri Lanka take whale-watching trips each year. Blue whales used to be abundant enough that some operators guaranteed a sighting or offered a free additional trip if there wasn’t one.

Oceanswell and BEAR have both conducted surveys on sightings at sea and spoken with whale-watching operators and fishermen, who agree that whale numbers are in decline.

“The reduction in numbers has been going on for a while,” de Vos told Mongabay. “We have seen dwindling numbers of blue whales in the last few years, not just 2024.”

Nanayakkara added that since 2018, “we observe a decline in blue whale sightings. In 2024, we saw one in the northwest, zero in the eastern coast and three off Mirissa, a total of four sightings this season. Even hydrophones haven’t been picking up the sounds from blue whales.” Compared to the reported 729 blue whale observations from 2015, this marks a dramatic decline.

Liyanage said NARA, the government’s marine research agency, is paying close attention to the trend. In 2024, it carried out a transect study that indicated a decline of more than 90%. More research is planned, he told Mongabay, adding that this year, “the scientific research vessel Fridtjof Nansen” — operated by the Norwegian government — “will undertake a comprehensive coastal study of marine mammal abundance and water quality parameters including plankton, chlorophyll and sea temperatures and there will also be short term surveys focusing on the hotspot between Dondra Head to Galle.”



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Advisory for Severe Lightning for the Western and Sabaragamuwa provinces and Galle and Matara districts

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Advisory for Severe Lightning
Issued by the Natural Hazards Early Warning Centre  at 12.00 noon 07 February 2026 valid for the period until 11.00 p.m. 07 February 2026

Thundershowers accompanied with severe lightning are likely to occur at some places in the Western and Sabaragamuwa province 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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INS GHARIAL departs island

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The Indian Naval Ship (INS) GHARIAL which made a port call in Colombo, departed the island on 06 Feb 26.

The Sri Lanka Navy bade a customary farewell to the departing ship at the Port of Colombo, following naval traditions.

During the ship’s port call, the crew took a sightseeing tour of key attractions in Colombo.

The visit also featured the handover of ten temporary Bailey Bridges, which were brought by INS GHARIAL, in coordination with the High Commission of India in Sri Lanka.

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Stop the collection of funds from parents at school level for Smart Boards — PM

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Prime Minister Dr. Harini Amarasuriya stated that the Ministry of Education has already commenced the distribution of Smart Boards required for the new education reforms, and that the collection of funds from parents at school level for this purpose must be stopped immediately. She further emphasized that no decision has been taken to curtail free education or to close the Jayewardenepura Faculty of Dental Sciences.

The Prime Minister made these remarks in response to a question raised in Parliament on Thursday [05th  February]  by the Leader of the Opposition,  Sajith Premadasa.

Elaborating further, the Prime Minister stated,

“Although the Leader of the Opposition has not traditionally upheld free education as a policy, I appreciate your stance on the matter at this juncture. However, I urge that questions should not be raised based on social media content or unverified rumours in Parliament. No decision has been taken to curtail free education or to close the Jayawardenepura Faculty of Dental Sciences. The Medical Faculty of the Wickramarachchi University of Indigenous Medicine had commenced operations without regulatory approval and had introduced course work, resulting in students being placed in a vulnerable situation. Necessary action is currently being taken based on the recommendations of a report submitted by an expert committee appointed to examine the issue. This this is not a political decision, but one guided by expert opinion”.

“Arrangements are underway to distribute the required Smart Boards to schools during this year, and  there is no need to collect funds from parents for this purpose. If any such collections are taking place, they must be stopped immediately. The Secretary to the Ministry of Education has already issued a directive instructing schools not to collect funds from parents”.

“The subject Information Technology will not be taught as a separate subject for Grades 1 to 5. However, recognizing the need to prepare students for a globally advancing technological world, discussions have been initiated based on expert advice on how to provide age-appropriate technological awareness to students. Decisions will be made after carefully considering child protection concerns and expert recommendations. The curriculum-related decisions will not be made politically, but by subject experts.

Based on the requests made by the universities and higher education institutions recruitment for essential academic vacancies is currently being carried out under the Cabinet approval. Although thirty years have passed since the establishment of the teacher service, further measures are required to enhance its quality. Existing issues relating to teacher promotions, considering the practical difficulties in evaluation processes and non-compliance with service minute provisions are being addressed alongside other challenges. The government is presently focused on formulating a systematic plan to ensure quality education.”

Responding to a question raised by the Member of Parliament Kader Mastan, the Prime Minister stated,

“Several programmes have been introduced based on government policy decisions to fulfill the basic needs of schoolchildren. These include the provision of school textbooks, uniforms, and the “Suraksha” health insurance scheme. Additionally, voucher schemes have been introduced to support the purchase of sanitary products for girls in Grades 6 to 13. Midday meals are also being provided for primary school students, and financial assistance is extended to students who pass the Grade 5 Scholarship Examination but do not receive bursaries. The Ministry of Education is in the process of gathering further information with the intention of expanding these programmes”.

The Prime Minister also announced that the 2025 G.C.E. Ordinary Level Examination is scheduled to be held from February 17 to 26. Although this period coincides with the observance of Ramadan, relevant authorities have confirmed that it will not pose an obstacle to the conduct of the examination. Furthermore, it has been decided to hold the Grade 5 Scholarship Examination and the G.C.E. Advanced Level Examination before August each year, and the G.C.E. Ordinary Level Examination in December. From 2026 onwards, efforts will be made to conduct examinations in accordance with this revised annual examination calendar.

[Prime Minister’s Media Division]

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