Threadfin Trevally

Interesting Info

• The Threadfin Trevally (Carangoides otrynter) is a sleek, silvery jack with long, threadlike rays on its dorsal and anal fins that trail elegantly as it swims — giving the species its name.
• Globally, it is found in the tropical eastern Pacific Ocean, ranging from southern Baja California in Mexico down to Ecuador, including the Galápagos Islands.
• The body is silvery-blue with a greenish back and sometimes faint golden spots, while the fins can appear yellowish or bluish in sunlight.
• The extra-long “thread” rays on the dorsal and anal fins are most striking in juveniles and smaller adults, where they stream behind the fish like ribbons.
• They form small to medium-sized schools, cruising over sandy bays, coral slopes, and open lagoons.
• Threadfin Trevally feed mainly on small fish, crustaceans, and squid, darting rapidly to chase down prey.
• They are thought to live up to about 8 years, with fast growth in their first few years of life.
• Spawning takes place offshore in warm tropical waters, where adults gather in groups to release eggs into the open sea. The larvae drift with plankton before moving to coastal nurseries.
• Juveniles are often seen near shallow reefs or sandy flats, sometimes hiding near debris or larger fish for protection.