Pacific croaker

📖 Overview

Pacific croaker (Johnius pacificus) is a ray-finned fish of the family Sciaenidae. It inhabits diadromous, migrating between freshwater and the sea waters. This species can reach a maximum total length of 14 cm. With a trophic level of 3.4, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Data Deficient on the IUCN Red List.

🔬 Taxonomy

🐟 Physical Description

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.: fusiform / normal.

🌀 Behaviour

Behavioural data for Pacific croaker is currently being reviewed.

🦐 Diet

Diet information for Pacific croaker is currently being compiled.

🥚 Reproduction

Reproduction data for Pacific croaker is currently being compiled.

🌍 Habitat & Distribution

Marine; freshwater; brackish; benthopelagic. Tropical Central Pacific: northern (=Pacific) coasts of New Guinea.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

🛡️ Conservation Assessment

📊 Population Risk & Fisheries

🐠 Related Species

🔍 Similar Species

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