Johnius borneensis (Bleeker, 1851)

Sharpnose hammer croaker

Catalog of Fishes (gen., sp.) | ITIS | CoL

Classification	Actinopterygii \| Perciformes \| Sciaenidae
Synonyms	Otolithus borneensis, Johnieops borneensis, Corvina canina, ... more
Common names	River jewfish, Hammer croaker, Sharptooth hammer croaker, ... more

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Image of Johnius borneensis (Sharpnose hammer croaker)

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This map was computer-generated and has not yet been reviewed.

AquaMaps Data sources: GBIF OBIS

Main reference

Sasaki, K. 2001. (Ref. 9772)
Other references | Biblio | Coordinator | Collaborators

Size / Weight / Age

Max length : 34.8 cm TL male/unsexed; (Ref. 55968); common length : 20.0 cm SL male/unsexed; (Ref. 9772)

Environment

Benthopelagic; freshwater; brackish; marine; depth range 0 - 132 m (Ref. 57178)

Climate / Range

Tropical; 30°N - 36°S, 32°E - 155°E (Ref. 56999)

Indo-West Pacific: Persian Gulf eastward to southern China and Taiwan and northern and northeastern Australia and New Guinea.
Countries | FAO areas | Ecosystems | Occurrences | Introductions

Short description

Dorsal spines (total): 10 - 12; Dorsal soft rays (total): 27 - 32; Anal spines: 2; Anal soft rays: 7 - 8. Snout rounded but not swollen or projecting; mouth large, oblique; upper jaw extending backward below posterior half of eye; no barbel on chin; teeth in narrow bands, well differentiated into large and small in both jaws, but none canine-like; gill rakers slender, about half length of gill filaments at angle of arch, 9 to 15 on lower limb. Second anal spine moderately long, 24 to 42 % of head length. Scales on head cycloid (smooth). Swim bladder hammer-shaped, the first pair of arborescent appendages entering head beyond transverse septum and sending a palmate branch to the front of pectoral arch. Sagitta (large earstone) with a tadpole-shaped impression, the head of which has its long axis lying obliquely to that of sagitta and the tail expanded and deepened as a hallow cone connected with the head by narrow groove.

Inhabits shallow coastal waters, estuaries, and rivers. In India, matures at the size of 14 to 16 cm TL; attains an average size of 15.8 cm TL, 20.6 cm TL, and 24 cm TL, at the end of 1 year, 1.5 years and 2 years, respectively. Juveniles prefer crustaceans and as they grow , show piscivorous tendency (Ref. 9772). Marketed fresh and dried salted (Ref. 3490).


IUCN Red List Status (Ref. 57073)	Threat to humans
Not Evaluated	Harmless

Human uses
Fisheries: minor commercial


More information
Countries FAO areas Ecosystems Occurrences Introductions Ecology Diet Food items Food consumption Ration	Common names Synonyms Metabolism Predators Ecotoxicology Reproduction Maturity Spawning Eggs Egg development	Age/Size Growth Length-weight Length-length Length-frequencies Morphometrics Morphology Larvae Larval dynamics Recruitment	Other references Biblio Aquaculture Aquaculture profile Strains Genetics Allele frequencies Heritability Diseases Processing	Collaborators Pictures Stamps Sounds Ciguatera Speed Swim. type Gill area Otoliths Brains Vision

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Internet sources

Estimation of some characteristics with mathematical models

Resilience (Ref. 69278)

High, minimum population doubling time less than 15 months (K=0.5-0.8)


Vulnerability (Ref. 59153)	Price category (Ref. 80766)
Low vulnerability (22 of 100)	Medium

Entered by Sa-a, Pascualita

Modified by Kesner-Reyes, Kathleen

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Page last modified by : elaxamana, 15 July 2009

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