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At 4 a.m. Tuesday, a Yilan local happened upon thousands of dead fish floating on the surface of Tarrochan Canal, right by Guangrong Road in Luodong Township. The local Environmental Protection Bureau immediately dispatched officers to assess the water quality. They found that although the pH levels were normal, the dissolved oxygen levels were not. At only 0.5 to 0.8mg per liter, it falls considerably below the 2.0mg per liter threshold for critical hypoxia. Officials are determining whether a sudden rise in temperature or illegal dumping of chemical waste is to blame.
Looking down from the embankment, one can see a large mass of white floating objects on the surface. Zoom in, and you’ll find numerous dead fish. The carcasses stretch several tens of meters, covering the water surface. Some have made their way further downstream.
Lin Chieh-chao
Dong’an Borough warden
It’s probably because the water’s too shallow and the sunlight is too strong. It’s hypoxia.
Lee His-chin
Luodong Township representative
For this stretch of water, over the years we’ve observed that every summer, it dries up all the way to the river bed, leaving it without water. Fish need water. Without sufficient oxygen levels, the fish will certainly die.
At 4 a.m. Tuesday, a local of Yilan’s Luodong Township was strolling along Tarrochan Canal when they got hit by a stench. Taking a look at the surface, they discovered a huge number of dead fish. They immediately reported the sighting to authorities. Soon afterwards, the local Environmental Protection Bureau dispatched officers to assess the water quality. They found that although the pH levels were normal, the dissolved oxygen levels were not. At only 0.5 to 0.8mg per liter, it falls considerably below the 2.0mg per liter threshold for critical hypoxia.
Chen Chih-hao
Yilan Irrigation Agency
From what we saw, we suspect that someone had sneakily dumped chemical waste, because the number of dead fish was huge, and even the hardiest bottom cleaners died.
Voice of Hu Pi-hui
Yilan Environmental Protection Bureau
At the moment, we’ve made our way upstream for inspections, and did not find any instances of abnormal runoff.
Officials are determining whether a sudden rise in temperature or illegal dumping of chemical waste was the culprit in the mass death of fish in the canal. At the moment, the carcasses have been removed and a physical barrier has been pulled up to prevent any individual dead fish from floating into the ocean.
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