Island trevally
species of fish
The island trevally, island jack, thicklip trevally or false bluefin trevally (Ferdauia orthogrammus) is a widespread species of offshore marine ray-finned fish classified in the jack family Carangidae. The island trevally is common through the tropical regions of the Indian and Pacific Oceans, ranging from Mozambique and the Seychelles in the west to Hawaii and the Revillagigedo Islands in the central and eastern Pacific. The species is almost completely absent from the continental shelves, instead inhabiting offshore islands, where it is found in lagoons and on reef systems. It is a moderately large fish, growing to a maximum recorded length of 75 cm and 6.6 kg in weight, and is distinguishable by its angular snout and yellow spots, as well as more detailed anatomical features. The island trevally often moves in small schools, preying on a variety of small fishes and crustaceans. It is of moderate importance to fisheries throughout its range, often taken by trawls, hook-and-line, and various inshore netting methods, and is sold fresh or salted at market.
Taxonomy and naming
The island trevally is classified in the genus Ferdauia together with the blue trevally (Ferdauia ferdau). Ferdauia falls into the jack and horse mackerel family Carangidae, and Carangidae is part of the order Carangiformes.
The species was first scientifically described by the American ichthyologists Jordan and Gilbert in 1881 based on a specimen taken from the Revillagigedo Islands, which was designated to be the holotype. They named this new species Caranx orthogrammus, but it was later moved to Carangoides after further revision of the family had occurred.
Begin with the source’s own compact description: “Island trevally” is species of fish. The dossier treats that line as a proposition to test through Island, trevally and species, not as a finished interpretation.
Why this record matters
The phrase “species of fish” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Datasets, specimens, observations and peer-reviewed methods provide the appropriate test for the technical claims summarized here. The source revision retrieved here is dated May 18, 2026. The linked authority identifier is Q602789. None of the 0 selected statements returned an explicit reference. The first chronological checks are 1881.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Check terminology, classification and the date of the cited evidence. Scientific names and technical consensus can change while older records retain historical value.
- Current terminology
- Classification context
- Finding cited technical literature
Primary datasets, specimen catalogues, standards bodies and the most recent peer-reviewed literature.
Three-step research path
- Establish the record: confirm the title “Island trevally”, its source revision and the description used here.
- Expand the search: follow Island trevally primary sources, Island trevally archive and Island research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Island trevally”?
- Which observation, specimen, dataset or publication supports the account?
- Is the terminology current, historical or disputed?
Search terms from this dossier
This entry incorporates text from “Island trevally” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.