scubaseason
Critically Endangered· population decreasing· assessed 2019

Scalloped Hammerhead Shark

Sphyrna lewini

Sighting evidence at La Cazuela, Gorgona Island

Scalloped Hammerhead Shark

Photo: Kris Mikael Krister · CC BY

Scalloped hammerheads aggregate at La Cazuela in schools of 20 to over 100 individuals, drawn by the upwelling currents that concentrate prey along the submerged ridge. These sharks are most reliably encountered from July through November when cold, nutrient-rich water pushes up from depth and creates ideal feeding conditions. Their schooling behaviour at Gorgona is one of the best-documented hammerhead aggregations on the Colombian Pacific coast.

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