scubaseason
Critically Endangered· population decreasing· assessed 2019

Scalloped Hammerhead Shark

Sphyrna lewini

Sighting evidence at San Miguel Bay Drop-Off, Donsol

Scalloped Hammerhead Shark

Photo: Kris Mikael Krister · CC BY

Scalloped hammerheads aggregate at the San Miguel Bay drop-off from November through February, drawn by the nutrient upwellings that concentrate their prey. Schools of 20 to 50 individuals are reported by experienced local guides, typically patrolling at 25 to 40 meters along the wall's steepest sections. This is one of the lesser-known hammerhead aggregation sites in the Philippines, offering encounters without the boat traffic of more famous locations.

Evidence at this site

No confirmed records on file at this site

Scalloped Hammerhead Shark is listed as a curated species here based on historical reports.

How is this calculated?

Sighting evidence is compiled from iNaturalist observation records within a set proximity radius, filtered for quality-grade observations. “Last confirmed” is the date of the most recent research-grade record. Record count covers a rolling 24-month window. Confidence reflects record count, recency, and consistency of seasonal signal.

Also seen at other sites