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Discovery of Sound in the Sea
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Bigeye Scad
(Selar crumenophthalmus)
Photo of a Bigeye scad
Courtesy of John E. Randall
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Series of grating sounds produced with their teeth.
There are some knocking sounds present in this recording. From CD Supplement to: Sounds of the Western North Atlantic Fishes by Fish & Mowbray, 1970. CD Copyright University of Rhode Island, 2001
Description
The bigeye scad is found in clear oceanic tropical waters worldwide. Occurring in schools as large as hundreds of thousands of individuals, it is a highly commercial species. The life of a bigeye scad is brief. Fish may mature by seven months and live only two years. Spawning has been reported to occur at night during April through September in Hawaii. As a fast growing, short lived species bigeye scad are highly fecund.

Rasping sounds emitted from individuals are commonly observed during capture. These sounds are produced by grinding of the pharyngeal teeth. Enormous schools may collectively produce low-frequency hydrodynamic sounds while swimming.