Patong –
Patong Beach has recently witnessed a striking natural event: seawater turning black along parts of the shoreline. According to the Marine and Coastal Resources Research Center, the phenomenon is caused by a plankton bloom, not by direct discharge of wastewater.
Laboratory tests confirmed the presence of two species of phytoplankton, Chaetoceros sp. and Peridinium sp., both of which are non-toxic. While harmless in terms of poisoning, experts advise against swimming during the discoloration period, as contact with the water may cause skin irritation. The bloom typically dissipates naturally within three to seven days, as waves and currents disperse the plankton.
Meanwhile, Patong Municipality has announced measures to safeguard the environment and public confidence. Officials will conduct random inspections of local businesses to prevent illegal wastewater discharge and ensure that treatment systems operate effectively. These steps are to reduce factors that could intensify plankton blooms. The municipality also pledged to coordinate closely with relevant agencies to monitor the situation.
