Pacific croaker (Johnius pacificus)

Scientific name: Johnius pacificus Hardenberg, 1941

The Pacific croaker (Johnius pacificus) is a freshwater fish of the family Sciaenidae. Native range: Western Central Pacific, northern (=Pacific) coasts of New Guinea.

Biology

Dorsal spines (total): 11; Dorsal soft rays (total): 25-29; Anal spines: 2; Anal soft rays: 7. Eye small, 11 to 16 % of head length; snout bluntly rounded; no barbel on chin; teeth differentiated into large and small in both jaws; gill rakers slender, about half the length of gill filaments at angle of arch, 10 to 13 on lower limb. Second anal spine long, stiff, 45 to 54 % of head length. Scales on head and throat cycloid (smooth). Swim bladder hammer-shaped, with about 12 pairs of arborescent appendages along its sides, the first entering head and sending a palmate branch to the front of the 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 a narrow groove.

Source: FishBase, licensed CC BY-NC 4.0.

Species facts

Scientific name
Johnius pacificus
Family
Sciaenidae (Drums or croakers)
Order
Perciformes (Perch-like fish)
Class
Actinopterygii (Ray-finned fishes)
Maximum length
14.0
Common length
10.0
Environment
Marine; freshwater; brackish; benthopelagic
Climate
Tropical
Distribution
Western Central Pacific: northern (=Pacific) coasts of New Guinea.
Conservation status (IUCN)
Not Evaluated
Threat to humans
Harmless
Uses
Fisheries: of no interest
Resilience
High, minimum population doubling time less than 15 months (Preliminary K or Fecundity.)

Sources

Taxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0.

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