On May 7, 2025, Mr. Chainarong Rueangthong, head of the Education and Conservation Center of Ayutthaya Province 5 (Nakhon Si Thammarat), announced the exciting results of a recent marine survey conducted between April 27 and April 30, 2025. This survey, carried out by a team of experts, uncovered three rare marine species in the waters surrounding Ang Thong National Marine Park: the Irrawaddy dolphin (Orcaella brevirostris), the Indo-Pacific humpback dolphin (Tursiops aduncus), and the green turtle (Chelonia mydas).
The research team utilized advanced scientific techniques, including boat surveys using the line intersect method and drone technology for aerial photography. These methods significantly enhanced the efficiency of data collection while minimizing disturbance to the marine life being studied.
At approximately 10:00 AM on April 28, the team spotted a pod of 5 to 7 Irrawaddy dolphins swimming in the northeastern area of Ko Tao. The researchers closely observed the dolphins and confirmed that they appeared to be in excellent health, with no signs of injury from fishing equipment. Their observations were met with excitement, as they noted the dolphins' contentment in their natural habitat.
Just a day later, around 11:20 AM on April 29, the team encountered 9 Indo-Pacific humpback dolphins near the Tak I Tiang area, which included a mother and calf pair. The researchers documented various behaviors, including social grouping, breaching, lobtailing, and spyhopping. While the overall health of the group was satisfactory, one dolphin exhibited signs of Tattoo Skin Disease (TSD), warranting further observation and study.
Later that same day, at approximately 2:29 PM, the team also observed a green turtle swimming in the same vicinity, surfacing for air. This discovery added to the positive findings of the survey, which underscored the rich biodiversity present in the marine park.
Following the sightings, Mr. Chainarong and his team collected photographs of the marine animals for further analysis, an essential step in the long-term monitoring and population assessment of these species. This process, known as Photo ID, is crucial for identifying individual animals, tracking their movements, and evaluating population dynamics over time.
The researchers also conducted preliminary water quality measurements in the areas where the animals were sighted. They found the average water depth ranged from 4.5 to 23.7 meters, with a temperature of 31.57 degrees Celsius, a pH level of 7.53, salinity at 31.80 ppt, and dissolved oxygen levels at 5.20 mg/L. These conditions were recorded at distances ranging from approximately 550 meters to 4.4 kilometers from the national park, and 11.1 to 51.2 kilometers from the coast.
The survey was carried out under favorable weather conditions, with calm seas and minimal wave height, which greatly facilitated the research team's efforts. Mr. Chainarong emphasized the importance of these findings, stating that they not only confirm the abundance of marine resources in Ang Thong but also highlight the necessity for a robust research team to continuously monitor, study, and gather scientific data.
Such ongoing research is vital for planning effective conservation strategies and sustainable management of Thailand's rare marine species. The team’s work serves as a foundation for future conservation efforts, ensuring that these unique marine animals continue to thrive in their natural habitats.
In contrast, during the survey conducted in the southern coastal areas of Khanom National Park, no sightings of dolphins or other rare marine animals were reported. This absence further illustrates the importance of targeted conservation efforts in specific areas where these species are known to inhabit.
As the team continues to monitor the health and populations of these marine species, their findings will play a crucial role in shaping future policies and conservation measures aimed at protecting Thailand's rich marine biodiversity.
Ultimately, the successful identification and monitoring of these marine species underscore the critical need for ongoing research and conservation efforts in Thailand's waters. The results of this survey not only provide valuable data for scientific understanding but also reinforce the importance of protecting these vulnerable species for future generations.
