Bar Jack
Caranx ruber
Sighting evidence at Isla Los Testigos Reef, Los Testigos
Photo: Kevin Bryant · CC BY-NC-SA
Bar jacks form large polarized schools over the reef edge at Los Testigos, hunting cooperatively to herd baitfish against the reef structure. Their metallic blue-silver flanks with the characteristic black and electric-blue lateral stripe flash as schools wheel in unison — a sight amplified by the exceptional visibility. These schools reach several hundred individuals at Los Testigos, a population size that indicates an unfished, fully functioning reef ecosystem.
Evidence at this site
No confirmed records on file at this site
Bar Jack is listed as a curated species here based on historical reports.