island trevally
Ferdauia orthogrammus
Island jack of oceanic islands, reaching 75 cm and 6.6 kg. It appears alone, in pairs or in small schools, and is used in commercial and sport fishing.
Also called: xaréu-insular, jurel isleño, island trevally
- maximum
- 75 cm
- record/max.
- 6.6 kg
- depth
- 0–168 m
who is the island trevally
The island jack belongs to the family Carangidae, with a spindle-shaped body compressed from the sides. It reaches 75 cm and 6.6 kg, and its common size is 40 cm. It occurs in the Indo-Pacific and, in the eastern Pacific, in Mexico, including the Revillagigedo Islands. Adults are pelagic and abundant around oceanic islands, and do not appear in coastal areas. They can be seen alone, in pairs or in small schools, near outer reefs and sandy channels in lagoons. They feed on small crustaceans that live in the sand. It is commercially fished and is also a sport fish.
Essential profile. Identification, where it occurs and rules, with data from FishBase and the cited regulations. Season, time of day, technique and bait are added once we have a good source for the island trevally; in the meantime, see the similar species.
fun facts
- Adults feed on small crustaceans that live in the sand.
identification
Spindle-shaped body, compressed from the sides, with the profile of a jack. Habitat matters most for identification: this is an island jack of oceanic islands, where adults are abundant, and it does not appear in coastal areas. To tell it apart from coastal jacks, such as the Pacific jack, look at where it was caught: the island jack stays around islands and outer reefs, not close to the shore.
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Each card shows the day's index (0 to 100) and, below it, a strip with the index for each hour, from 0h to 23h. from poor to excellent.
Essential profile: the index uses a general fish model (weather, sun, moon and tide), without a season or time of day specific to this species.
where found
Found in the Indo-Pacific and, in Latin America, in the eastern Pacific off Mexico, including the Revillagigedo Islands.
Habitat: Oceanic waters and reefs around islands, 0 to 168 m deep.
rules for the island trevally
Summary of the regulations we found, with the source for each. Rules change; before keeping or transporting fish, check with the state environmental agency.
We found no species-specific rule beyond the region's general rules.
catch and release
catch and release Releasing the fish alive, quickly and with a wet hand. During a closed season it isn't always allowed: what the regulation says applies.
No recorded danger to anglers. It is a fish up to 6.6 kg: hold it firmly by the body, avoid the mouth when removing the hook, and release it quickly.
in the kitchen
It is usually sold fresh, dried or salted.
how much it weighs without taking it out of the water
Length-weight relationship W = a·Lb (a = 0.01318, b = 2.96; FishBase (relação peso-comprimento bayesiana, estimativa da própria espécie)). It's an average: a fat or lean fish can vary by 10% to 20%.
estimated weight
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sources and references
Essential profile: size, length-weight, depth, countries and conservation come from FishBase and the cited regulations, and the texts were written from those sources. Season, time of day, sensitivities, technique and baits and lures are not included yet, because we did not find a good source for this species.
- scientific FishBase: Ferdauia orthogrammus (ficha da espécie)Size, length-weight, depth, habitat, distribution, biology, and IUCN status. Page checked on Oct 13, 2026.
- scientific FishBase: nomes populares de Ferdauia orthogrammusNames by country and language.
