Sat Oct 19 20:03:50 UTC 2024: On the night of October 19, 2024, residents of Thiruvanmiyur and Neelankarai in Chennai witnessed a bioluminescent display at the beach, attracting crowds spurred by social media. This phenomenon, occurring after a notable sighting in 2019, featured glowing waters due to certain organisms’ ability to produce light, such as dinoflagellates, jellyfish, and copepods.
Marine biologist S. Velvizhi explained that bioluminescence serves various functions for marine organisms, including defense, communication, and attraction of mates. Amit Kumar, an associate professor, suggested that recent heavy rainfall and lower sea temperatures contributed to nutrient surges that favor bioluminescent species like Noctiluca scintillans. He noted that similar nutrient influxes have occurred in the past, but while dinoflagellates produce a stunning glow, they can also lead to oxygen depletion in water, posing risks such as hypoxia.
Overall, most instances of bioluminescence are considered harmless, despite occasional ecological concerns related to algal blooms.
First Piper 