Reproductive biology

As with many pelagic fishes, stromateoids are broadcast spawners, releasing large quantities of eggs into the pelagic realm upon spawning. Spawning may occur on a yearly basis during the summer months in some species, but spawning periods are unrecorded for many stromateoids. The eggs are small, ranging from 0.03-0.07 in (about 0.07-0.18 cm) in diameter, when known; they are spherical, separate, and pelagic; and usually contain a single oil droplet. Hatching usually occurs under 0.2 in (0.5 cm) in length, and flexion takes place shortly thereafter. Depending on the species, juveniles begin to resemble adults at about twice their flexion length. The eggs and larvae of about one-half of all stromateoid species have yet to be described.

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