Large Number of Fish Die in Wanggong, Changhua; Preliminary Judgment: Low Dissolved Oxygen

Hong Teng-ming told CNA reporters that heavy rains in recent days have led to suspicions that wastewater may have been discharged into the water, causing oxygen depletion in fish. While fish kills have occurred in the past, this incident is particularly severe. The Environmental Protection Bureau has been asked to conduct water quality testing to clarify the cause of pollution and to clear the dead fish as quickly as possible.

Furthermore, Hong Teng-ming pointed out that the water gate next to Wanggong Fishing Port has long had drainage problems. He urged relevant authorities to address the overall management of the estuary and improve drainage and water quality from the source to prevent similar incidents and ensure local environmental safety and the livelihoods of fishermen.

The Environmental Protection Bureau stated that upon inspection, the area was full of water and the water appeared clear. No abnormal discharges were found during the patrol along the line. Water temperature was measured at approximately 23.7 degrees Celsius, pH at 7.52, and dissolved oxygen at 1.17 mg/L. The preliminary judgment is that fish deaths were caused by excessively low dissolved oxygen levels.

According to the National Environmental Water Quality Monitoring Information Network, the basic survival requirement for fish is a dissolved oxygen level of 3 or 4 mg/L or higher. Levels below 2 mg/L can cause fish to die from oxygen deprivation. (Editor: Chang Ya-ching) 1150408