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🌊 Marine Least Concern 🌡️ Tropical

Small-jaw croaker

Nibea microgenys Sasaki, 1992
Max Length
23 cm
Max Weight
-
Lifespan
-
Trophic Level
3.5
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
26.00/100
Typical Length
19 cm
Depth Zone
-

📖 Overview

Inhabits shallow coastal waters, estuaries and rivers . Mainly found in brackish or marine conditions, but sometimes penetrates fresh water .

Scientific Name
Nibea microgenys
Authority
Sasaki, 1992
Habitat
Marine
Climate
Tropical
Body Shape
Fusiform / normal
IUCN Status
LC
Max Length
23 cm
Trophic Level
3.5
Resilience
High
Vulnerability
26.00/100
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 11; Dorsal soft rays (total): 29 - 31; Anal spines: 2; Anal soft rays: 7. Snout pointed, projecting in front of upper jaw; mouth small, inferior, slightly oblique; upper jaw length 32-38 % of head length, lower jaw length 34-40 % of head length. Mental pores in 3 pairs, the first close together, united by a crescent-shaped groove just behind symphysis. Teeth differentiated into large and small in upper jaw only; a band of villiform teeth in lower jaw. Second anal spine long, stiff, 44 to 57 % of head length. Swim bladder carrot-shaped, with 19-21 pairs of arborescent appendages along its sides, the first pair entering head beyond transverse of septum. Sagitta (large earstone) with a tadpole-shaped impression, the tail of which is J-shaped.: fusiform / normal.

🌀 Behaviour

Behavioural data for Small-jaw croaker is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring-summer
Spawn Location
Pelagic
Fertilization
External

🌍 Habitat & Distribution

Marine; brackish; benthopelagic. Tropical Central Pacific: northern Australia, including the northwestern coast.

🌿 Ecology

Zone Preferences
🌊 Marine 🌿 Brackish
Trophic Level
3.5±0.5

📐 Morphometrics

Length–Weight Relationship: W = 0.00871 × L3.07 (TL)
Max TL
23cm
Dorsal Spines
11
Dorsal Rays
30
Anal Spines
2
Anal Rays
7

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2016

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
26.00/100
Low vulnerability
Trophic Level
3.5
Predator
Body Shape
Fusiform / normal
Climate Zone
Tropical
Described By
Sasaki, 1992

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