Residents of Tanauan City, Batangas and surrounding areas have noticed the unusual green color of Taal Lake.

Similar color changes have also been seen in Barangay Balas, Talisay, Batangas, and parts of Balete, Batangas.

The Protected Area Management Office-Taal Volcano Protected Landscape (PAMO-TVPL) has clarified that the change of color change is not related to volcanic activity.

According to their advisory, the phenomenon is known as "algal bloom."

"Nagkaroon ng decomposition ng mga organism; tumaas 'yung nutrients. So ibig sabihin nagkaroon ng discoloration sa lawa," Joseph Pusancho, Protected Area Superintendent at TVPL, said.

"Wala naman kaming masyadong nakikitang epekto doon sa mga tilapia natin na nagko-contribute sa mortality," Pusancho added.

This natural occurrence is a sign of increased phytoplankton in the lake.

Pusancho also noted that warm weather conditions could have contributed to the bloom.

"Kasi 'yan [na] phytoplankton, maliliit na organismo 'yan na kinakain din ng mga wild na isda. ['Yung] mga isda, kinakain din nila 'yan para sa kanilang survival," he added.

TVPL has advised residents and visitors to avoid water activities such as swimming and bathing in the lake while the algal bloom is present, as it may cause skin irritation.