The huge 1754 eruption that lasted for 6 months from May to December 1754 changed the salinity of the water from salt to freshwater.
The Pansipit River narrowed down where once upon a time Galleons can enter from Balayan Bay to Taal Lake.
It gave way and formed a new land blocking the mouth of the Pansipit River and that land later on became Lemery, Batangas in 1861.
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New islands sprouted up from underneath like Napayong Island located in Tanauan.
This gave way to new forms of species like the Maliputo and Tawilis.
Maliputo was actually a Trevally or Talakitok but since it turned freshwater, then it became the Maliputo
Tawilis was actually a sardine that turned into a freswater sardine trapped inside the lake when the salinty changed.
There are fossils of old coral reefs in Taal Lake proving that once upon a time it was saltwater. The last shark sighting in Taal was in 1935.
The Capital was moved from Taal to Batangan now called Batangas City and from 1755, they started calling it Batangas province coming from Taal province and prior to that as Balayan province, the first capital.
The map of Batangas drastically changed so you have to respect and adjust with nature and learn from its violent history.