Least Concern· population decreasing· assessed 2019

Bigeye Jack

Caranx sexfasciatus

Sighting evidence at Dakar Artificial Reef, Senegal

Photo: Mark Rosenstein · CC BY-NC

Bigeye jacks form spectacular spiraling schools around the reef modules, hunting cooperatively to herd baitfish against the artificial structure before charging through the panicked shoal. Their large eyes are an adaptation to crepuscular and night-time feeding, and dawn and dusk dives at the Dakar reef produce the most intense schooling activity. Populations here are thriving, benefiting from the artificial structure's role as a fish aggregation device.

Evidence at this site

0 records within 25 km

Confidence: low

No date on file

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.

Bigeye Jack

Evidence at this site

Also seen at other sites