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💧 Freshwater Endangered 🌡️ Temperate

Oxleyan pygmy perch

Nannoperca oxleyana Whitley, 1940
Max Length
7.5 cm
Max Weight
-
Lifespan
-
Trophic Level
3.2
Depth
-
Climate
Temperate
Resilience
Medium
Vulnerability
18.00/100
Typical Length
4 cm
Depth Zone
-

📖 Overview

Inhabits ponds, dune lakes and creeks, usually among aquatic weeds . Lives in swamps with prolific sedge growth, gently flowing streams and dune lakes in areas of coastal heathland (wallum). Water is often darkly tannin-stained and acidic (pH 5.4-6.5) with temperature range from 12° to 28°C . Feeds primarily on aquatic insects and their larvae . Also consumes microcrustaceans and algae. Breeding season extends from October to May, when water temperatures rise above 20°C. The breeding habits and biology are similar to other nannopercids, but this species takes only 4-5 months to attain sexual maturity . Aquarium conditions: pH=7.2, H=8, 26°C water temperature, egg layer, plant and rock cover, peaceful community fish .

Scientific Name
Nannoperca oxleyana
Authority
Whitley, 1940
Habitat
Freshwater
Climate
Temperate
IUCN Status
EN
Max Length
7.5 cm
Trophic Level
3.2
Resilience
Medium
Vulnerability
18.00/100
Water Temp
16–30 °C
Salinity
0–0.5 ppt

🐟 Physical Description

Physical description for Oxleyan pygmy perch is currently being compiled.

🌀 Behaviour

Behavioural data for Oxleyan pygmy perch is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

Size at Maturity
2.9cm TL

During the breading season, N. oxleyana displays sexual dichromatism, with males showing more intense changes . Males display a darkening of the dorsal, anal and pelvic fins and red colouration of the body and caudal fin . Serial spawner .

🌍 Habitat & Distribution

Freshwater; benthopelagic; pH range: 6.0 - 6.5; dH range: 5 - 10. Temperate; 16°C - 30°C ; 25°S - 29°S northeast and southeast Australia, from Noosa River to Richmond River (Ref.

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
3.2±0.4
Food Items

aquatic insects and their larvae (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.01047 × L3.01 (TL)
Max TL
7.5cm

🌡️ Water Parameters & Tolerance

Temperature Range
16–30°C
pH Range
6–6.5
Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Endangered
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
Medium
Minimum doubling time
Fishing Vulnerability
18.00/100
Low vulnerability
Trophic Level
3.2
Predator
Climate Zone
Temperate
Described By
Whitley, 1940

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