Gymnocranius euanus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Spariformes
Family: Lethrinidae
Genus: Gymnocranius
Species:
G. euanus
Binomial name
Gymnocranius euanus
(Günther, 1879)
Synonyms[2]
  • Sphaerodon euanus Günther, 1879
  • Monotaxis affinis Whitley, 1943
  • Gymnocranius japonicus Akazaki, 1961

Gymnocranius euanus, the Japanese large-eye bream, Japanese sea bream, paddletail bream, speckled emperor or iodine bream, is a species of marine ray-finned fish belonging to the family Lethrinidae, the emperors and emperor breams. This fish is found in the Western Pacific Ocean.

Taxonomy

Gymnocranius euanus was first formally described as Sphaerodon euanus in 1879 by the German-born British ichthyologist Albert Günther with its type locality given as Eua in the Friendly Islands.[3] Some authors place the genus Gymnocranius in the subfamily Monotaxinae but the 5th edition of Fishes of the World does not recognise the subfamilies traditionally accepted within the family Lethrinidae as valid. The family Lethrinidae is classified by the 5th edition of Fishes of the World as belonging to the order Spariformes.[4]

Etymology

Gymnocranius euanus has a specific name which suffixes -anus onto the type locality of 'Eua in modern Tonga.[5]

Description

Gymnocranius euanus has an oblong body that has a depth which fits into its standard length around two and a half times. The head has a deeply sloping dorsal profile. The eye is placed high on the head and is relatively large, although its diameter is a little less than the length of the snout. It has a relatively small mouth which has 2 or 3 pairs of small, thin canine-like teeth at the front of each jaw with most of the remaining teeth bristle-like but there are well developed molar-like teeth on the sides of the jaws. The dorsal fin is supported by 10 spines and 10 soft rays while the anal fin contains 3 spines and 10 soft rays. The caudal fin is moderately forked with blunt tipped lobes.[6] The overall colour is silvery-grey to bluish grey marked with small black spots which are scattered on the body with pale pink fins.[7] This species has a maximum published total length of 45 cm (18 in), although 35 cm (14 in) is more typical.[2]

Distributiion and habitat

Gymnocranius euanus is found in the Western pacific Ocean wheer it ranges from the Gulf of Thailand eastto New Caledonia and Tonga, north to southern Japan and south to Australia. In Australia it is found from nortwest of Kalbarri, Western Australia around the northern coast to the Solitary Islands in New South Wales, the Coral Sea reefs, Lord Howe Island and Norfolk island.[7] This species is found at depths between 15 and 50 m (49 and 164 ft) on substrates of sand and rubble next to rock and coral reefs in lagoons and on outer slopes.[2]

Biology

Gymnocranius euanus has adiet dominated by small bottom-dwelling gastropods. In Vanuatu these fishes have been recorded spawning in April and August.[1]

Fisheries

Gymnocranius euanus is a target for commercial fisheries in some areas where it is found being caught with long lines and hand lines.[1]

References

  1. 1 2 3 Carpenter, K.E.; Lawrence, A. & Myers, R. (2016). "Gymnocranius euanus". IUCN Red List of Threatened Species. 2016: e.T16719387A16722305. doi:10.2305/IUCN.UK.2016-3.RLTS.T16719387A16722305.en. Retrieved 28 November 2023.
  2. 1 2 3 Froese, Rainer; Pauly, Daniel (eds.) (2023). "Gymnocranius euanus" in FishBase. October 2023 version.
  3. ↑ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Gymnocranius". Catalog of Fishes. California Academy of Sciences. Retrieved 28 November 2023.
  4. ↑ Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 502–506. doi:10.1002/9781119174844. ISBN 978-1-118-34233-6. LCCN 2015037522. OCLC 951899884. OL 25909650M.
  5. ↑ "Order SPARIFORMES: Families LETHRINIDAE, NEMIPTERIDAE and SPARIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf. 17 October 2022. Retrieved 28 November 2023.
  6. ↑ Kent E. Carpenter; Gerald R. Allen (1989). Emperor fishes and large-eye breams of the world (Family Lethrinidae). An annotated and illustrated catalogue of lethrinid species known to date (PDF). FAO Species Catalogue. Vol. 9. FAO, Rome. pp. 22–223.
  7. 1 2 Bray, D.J. (2021). "Gymnocranius euanus". Fishes of Australia. Museums Victoria. Retrieved 28 November 2023.
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