Bigeye trevally
A large marine fish found in tropical oceans, known for its nocturnal hunting and distinctive dark dorsal fin.
The bigeye trevally is a widespread species of jack found across the Indian and Pacific Oceans. It grows to over a metre long and is valued by both commercial fisheries and sport anglers for its size and fighting ability.
- Grows to 120 cm and 18 kg.
- Hunts at night unlike most jacks.
- Juveniles have vertical dark bands.
- Found in Indian and Pacific Oceans.
- Hybridizes with bluefin trevally.
What it is
This species belongs to the jack family and is one of the larger members of its genus. Adults reach lengths of 120 cm and weights of 18 kg. The body is compressed and oblong with a slightly pointed snout. A key identifier is the second dorsal fin, which is dark with a white tip. Juveniles display five or six vertical dark bands that fade as they mature. Adults are silvery blue above and white below, with a small dark spot on the gill cover.
Where it lives
The fish inhabits tropical and subtropical waters globally. In the Indian Ocean, it ranges from South Africa to Japan and Australia. In the Pacific, it extends from Hawaii to California and Ecuador. It prefers inshore coastal zones, coral reefs, and rocky complexes. Juveniles often enter shallow lagoons, mangroves, and even rivers before moving to deeper waters as adults.
How it lives
It forms large schools of over 1500 individuals during the day. Unlike many jacks, it hunts at night, dissolving schools to feed individually or in small groups. Diet shifts from crustaceans in youth to nearly exclusive fish consumption in adulthood. It preys on sea-skaters, shrimps, and small fish. Larger individuals serve as prey for sharks, birds, and other predators.
Breeding and life cycle
Sexual maturity occurs at 42 cm. Spawning happens in large aggregations, varying by region from July to March. Pairs break from the school, turning black to deter others, and spawn while swimming horizontally. Larvae have a distinct pigmented crest and low anal fin ray count. Hybrids with the bluefin trevally have been documented in Hawaii.
Fish and people
The species supports commercial and artisanal fisheries using nets and hooks. It is sold fresh, dried, or salted. Anglers prize it as an excellent gamefish, caught by lure or bait near reefs and jetties. Night fishing with lights attracts large numbers. Catches vary by region, with significant landings reported in Mexico, Saudi Arabia, and Papua New Guinea.
Status and threats
The International Union for Conservation of Nature lists the species as Least Concern. It is widespread and abundant in many areas. However, local populations may face pressure from overfishing and habitat loss. Climate events like El Niño can cause temporary drops in abundance along the American coast.
![500px provided description: Trevalli Ball [#australia ,#queensland ,#coral sea ,#scuba diving ,#liveaboard]](https://thumb.wikimedia.org/wikipedia/commons/thumb/3/3a/Trevalli_Ball_%28226275027%29.jpeg/960px-Trevalli_Ball_%28226275027%29.jpeg)
Questions people ask about Bigeye trevally
What does the bigeye trevally eat?
Adults primarily eat small fish, supplementing with crustaceans and cephalopods. Juveniles consume more shrimps and other invertebrates. They hunt at night, breaking from daytime schools to feed individually or in small groups.
Where can I find this fish?
It lives in tropical and subtropical waters of the Indian and Pacific Oceans. Ranges include South Africa to Japan, and Hawaii to California. It prefers inshore reefs, lagoons, and estuaries.
Is it good to eat?
Yes, it is rated as a fair to good table fish. It is sold fresh, dried, or salted in markets. It is also highly valued by sport anglers for its fighting ability.
How does it look when young?
Juveniles are silvery yellow or brown with five to six dark vertical bands on their sides. These bands fade as they mature into adults, which become silvery blue and white.
Good reading and sources
- Bigeye trevally on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Bigeye trevally", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
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