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Sudden algal bloom dealt death blow to Trinco’s triggerfish
View(s):By Malaka Rodrigo
Trincomalee is known for its serene beaches but certain areas recently emanated a foul smell due to thousands of decaying fish washing ashore and floating in the shallow bays. People speculated various theories, from pollution and temperature changes to an impending natural disaster or even a bizarre case of mass fish suicide. 
This occurred between October 29and November 1, coinciding with Halloween week, sparking eerie rumors of supernatural occurrences. The affected species, the Red-toothed Triggerfish (Odonus niger), is named for its distinctive red teeth visible when the mouth is closed. The sight of these dead fish might easily inspire Halloween-themed stories. However, the mass death of triggerfish was linked to a natural phenomenon – a sudden algal bloom, said Dr. Sujeewa Athukoorala, a senior scientist at the National Aquatic Resources Research and Development Agency (NARA). Analysis of satellite imagery from the affected period revealed a high-density algal bloom in Trincomalee’s waters. The thick algal layer likely caused oxygen depletion in the fish’s habitat. Additionally, the dense algae can clog the gills of triggerfish, impairing their respiration. This combination of low oxygen and gill blockage led to the mass death, said Dr. Athukoorala.
Sri Lanka experienced heavy rainfall throughout October, and the Mahaweli River, which flows into the sea at Trincomalee, likely brought large volumes of freshwater and nutrients into the marine environment. Torrential rain often carries excess nutrients, potentially triggering algal blooms, Dr. Athukoorala told the Sunday Times.
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