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Diadromous Least Concern 🌡️ Tropical

Bottlenose jewfish

Johnius australis Günther, 1880
Max Length
23 cm
Max Weight
-
Lifespan
-
Trophic Level
3.5
Depth
-
Climate
Tropical
Resilience
High
Vulnerability
26.00/100
Typical Length
18 cm
Depth Zone
-

📖 Overview

Bottlenose jewfish (Johnius australis) 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 23 cm. With a trophic level of 3.5, it is a low-level carnivore, feeding on invertebrates and small organisms. It is assessed as Least Concern on the IUCN Red List.

Scientific Name
Johnius australis
Authority
Günther, 1880
Habitat
Diadromous
Climate
Tropical
IUCN Status
LC
Max Length
23 cm
Trophic Level
3.5
Resilience
High
Vulnerability
26.00/100
Salinity
30–40 ppt

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 11; Dorsal soft rays (total): 26 - 31; Anal spines: 2; Anal soft rays: 7. Body silvery, everywhere so clouded with brown dots as to quite obscure the ground color; pectoral and pelvic fins pale .

🌀 Behaviour

Behavioural data for Bottlenose jewfish is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous 📦 Batch Spawner
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

🌍 Habitat & Distribution

Marine; freshwater; brackish; benthopelagic. Tropical Southwest Pacific: Known along the coasts of northern and northeastern Australia and New Guinea.

🌿 Ecology

Zone Preferences
🌊 Marine 💧 Freshwater 🌿 Brackish
Trophic Level
3.5±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.00575 × L3.13 (TL)
Max TL
23cm
Dorsal Spines
11
Dorsal Rays
29
Anal Spines
2
Anal Rays
7

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2018

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
26.00/100
Low vulnerability
Trophic Level
3.5
Predator
Climate Zone
Tropical
Described By
Günther, 1880

🌐 Names & Taxonomy

Scientific Synonyms

Scientific Name Author Year Status
Corvina australis Günther 1880 Synonym
Corvina comes De Vis 1884 Synonym

🗺️ Global Occurrence Map

Occurrence records from the Global Biodiversity Information Facility (GBIF) - 1 records indexed .

Occurrence density from GBIF View GBIF records ↗

👥 Community & Contribute

Aquareap Community Observations
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