Summary
Highlights
Taal Lake is home to the tawilis, a unique sardine species and a flagship species for the active volcano's protected landscape. It's also a vital source of income for half a million people, mostly fishermen. The tawilis is found only in Taal Lake, having been trapped there after a 1754 volcanic eruption closed the spillway, turning the marine environment into freshwater.
The tawilis faces two major threats to its existence: another major volcanic eruption, which could change the lake's topography and introduce toxic materials, and the more immediate threat of overfishing. The 2020 Taal eruption demonstrated the species' vulnerability, with the tawilis population declining significantly from 1,120 metric tons in 1998 to just 372 metric tons in 2021.
Scientists regularly test Taal Lake's water, revealing alarming findings: rising levels of sulfides, phosphates, and ammonia, while dissolved oxygen levels are falling. These conditions lead to more frequent fish kills. Human activities, particularly the decomposition of leaves and food flowing into the lake, are largely responsible for this pollution, as indicated by the high phosphate and ammonia concentrations that can trigger algal blooms and damage fish gills.
Fishermen in Taal Lake find themselves in a difficult situation. Despite assurances that tawilis is safe to eat, their catches have drastically decreased. A three-hour vigil in the middle of the lake can yield zero catch, a stark sign of the tawilis's dwindling numbers. The use of illegal fine nets, though profitable in the short term, further depletes the population and damages the lake bed where tawilis lay eggs.
Agencies are rallying support from local mayors to save the tawilis, enforcing regulations like banning active fishing gear and implementing a two-month closed season for tawilis fishing. However, illegal fishing persists due to lack of enforcement and the economic needs of fishermen. The challenge lies in balancing species conservation with providing sustainable livelihoods for the local community, requiring an agreement on appropriate fishing practices to allow tawilis to grow and multiply for future generations.
The deteriorating water quality caused by human actions is pushing the tawilis towards extinction. It is a race against time to correct these mistakes, or Taal Lake could soon lose its unique freshwater sardine, impacting both the ecosystem and the livelihoods of thousands.