Crossorhombus azureus  (Alcock, 1889)

Blue flounder
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Crossorhombus azureus   AquaMaps   Data sources: GBIF OBIS
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Image of Crossorhombus azureus (Blue flounder)
Crossorhombus azureus
Picture by CSIRO

Classification / Names Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa

Actinopterygii (ray-finned fishes) > Pleuronectiformes (Flatfishes) > Bothidae (Lefteye flounders)
Etymology: Crossorhombus: Greek krossoi = tassel + Greek, rhombos = paralelogram (Ref. 45335).

Environment / Climate / Range Ecology

Marine; demersal; depth range 13 - 60 m (Ref. 9824).   Tropical

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 18.0 cm TL male/unsexed; (Ref. 9824)

Short description Morphology | Morphometrics

Dorsal soft rays (total): 84-92; Anal soft rays: 63 - 74. Ground colour on eyed side brownish grey, with darker spots and blotches. Fins paler than body, dorsal and anal fins with small dark spots, caudal fin with 2 distinct dark bands. Males with small dark spots in anterior part of interorbital region. Blind side whitish in females. Males with distinct bluish black pyriform colour pattern on blind side. Body ovoid, its depth 1.7 to 2 times in SL. Head small, snout shorter than eye, profile steep anterior to interorbital area. Head length 3.3 to 4.5 times in SL. Interorbital region broad and concave, wider in males than females in specimens greater than about 6 cm SL. Males with a rostral spine and 1 to 3 low bony bumps around orbits. Both eyes on left side of head, front margin of upper eye slightly behind front margin of lower eye. Both eyes in males larger than about 6 cm SL with a flap on posterior area. Mouth small, reaching to or slightly beyond anterior margin of lower eye, length of upper jaw 3.1 to 4.3 times in head length. Teeth in upper jaw biserial, teeth of outer row more widely spaced than teeth of inner row; teeth in lower jaw uniserial. Gill rakers short and pointed. Scales on eyed side with long ctenii. Pectoral fin on eyed side with 11 to 14 rays, its length 1.3 to 1.6 times in head length in both sexes. Pectoral fin on blind side with 9 to 12 rays (Ref 42535).

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Indo-West Pacific: Bay of Bengal, northwestern Australia, South China Sea, China, Taiwan, Japan, Viet Nam, and Aru Islands, Indonesia.

Biology     Glossary (e.g. epibenthic)

Lives on mud bottoms and feeds on bottom-living animals (Ref. 9824). Sexually dimorphic characters develop at about 6 cm SL (Ref. 9824).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : Amaoka, Kunio | Collaborators

Sainsbury, K.J., P.J. Kailola and G.G. Leyland, 1985. Continental shelf fishes of the northern and north-western Australia. CSIRO Division of Fisheries Research; Clouston & Hall and Peter Pownall Fisheries Information Service, Canberra, Australia. 375 p. (Ref. 3131)

IUCN Red List Status (Ref. 96402)

CITES (Ref. 94142)

Not Evaluated

Threat to humans

  Harmless




Human uses

Fisheries: of no interest
FAO(Publication : search) | FisheriesWiki | Sea Around Us

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BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes (gen., sp.) | DiscoverLife | Faunafri | Fishtrace | GenBank(genome, nucleotide) | GOBASE | Google Books | Google Scholar | Google | IGFA World Record | iSpecies | National databases | PubMed | Scirus | SeaLifeBase | Tree of Life | uBio | Wikipedia(Go, Search) | World Records Freshwater Fishing | Zoological Record

Estimates of some properties based on models

Phylogenetic diversity index (Ref. 82805):  PD50 = 0.5312   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00434 - 0.02305), b=3.02 (2.82 - 3.22), based on LWR estimates for this (Sub)Family-body shape (Ref. 93245).
Trophic Level (Ref. 69278):  3.5   ±0.37 se; Based on food items.
Resilience (Ref. 69278):  High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153):  Low vulnerability (10 of 100) .