By Bill Jaynes
The Kaselehlie Press
September 13, 2026
Yap, FSM— Yap authorities say heavy rain and flooding, followed by unusually low tides and high temperatures, appear to have contributed to the mass deaths of reef fish and other marine life reported along the western coast of Yap Proper in August.
A newly released public advisory from Yap’s Disaster Coordinating Office, Marine Resources Management Division, and Department of Resources and Development provides preliminary findings on the event and urges residents to continue avoiding affected shallow reef areas and not to collect or eat dead or distressed marine life.
Communities reported dead reef fish, invertebrates, and other marine life washing ashore along Yap Proper’s western coast on August 22.
According to the advisory, preliminary findings indicate that heavy rain and flooding carried sediment, organic matter, and nutrients into shallow coastal waters.
Authorities said rapid microbial activity likely reduced dissolved oxygen in the water, creating localized hypoxia—a condition in which oxygen levels become too low to adequately support marine life.
The problem was apparently compounded by unusually low tides and high temperatures, which the advisory said added heat and exposure stress.
The advisory does not identify a single confirmed cause of the mortality and says agencies are continuing to monitor conditions and coordinate further assessment.
It also notes that no water discoloration typical of a harmful algal bloom was reported during interviews.
Fish deaths were reported in the villages of Yyin, Gilfith, Rang, and Tamil. The advisory also lists Ifanif, Weloy, and Kanifay among communities where residents should remain alert, and says all western-coast communities should follow official advisories.
Authorities are asking residents to keep away from affected shallow reef areas, refrain from collecting dead or distressed fish or invertebrates, and not consume marine life found dead or behaving abnormally.
Residents should also follow advisories issued by health and environmental agencies and report new fish deaths, unusual odors, or abnormal water conditions to local authorities.
The public is being asked to immediately report current or future sightings of irregular marine or environmental occurrences and, when possible, provide photographs.
Reports can be made to the Yap Environmental Protection Agency at 350-2113, the Disaster Coordinating Office at 350-2145, or the Department of Health Services at 350-2110.
The advisory says monitoring and further assessment of the affected areas are continuing.
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