This causes a change in the acidity of the water, and the fish are deprived of oxygen to the point of mass death.
Previously, the phenomenon of fish dying suddenly in Lake Ranau occurred in 2011.
The phenomenon of sudden fish deaths did not occur extensively at the time.only visible in the hot spring discharge area.
Where the fish died, the lake water is milky white and smells of sulfur gas.
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Similar occurrences have occurred in the last 50 years.In particular, in 1962, 1993, 1995, and 1998.
Reporting from esdm.go.id, the results of an examination of the dead fish phenomenon in 2011 were located close to three hot springs.
contains hot springsBatu City, Ujung, and Way Wahid hot springs But no dead algae were found on the surface of the lake.
At that location, there was no smell of sulfur gas. The lake water is clear, and there are gas bubbles rising from the bottom of the lake in the hot spring area.
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The death of this fish was caused by the release of sulfur gas (H2S gas) to the surface in the hot spring area.
It spreads in a number of directions based on the dominant current. The presence of H2S gas is related to the presence of geothermal (hydrothermal) manifestations.
This hydrothermal gas is trapped in the pocket at a certain time and will be released to the surface after pressure occurs due to disturbances such as tectonic earthquake shocks.
H2S exits through the weak zone, which is the point where hot water comes out.
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The 5.1 Richter scale tectonic earthquake in Bengkulu on March 29, 2011, triggered an increase in pressure on the fault around Lake Ranau.