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💧 Freshwater Critically Endangered 🌡️ Temperate

Bignose galaxias

Galaxias macronasus McDowall & Waters, 2003
Max Length
7 cm
Max Weight
-
Lifespan
-
Trophic Level
3.1
Depth
-
Climate
Temperate
Resilience
High
Vulnerability
14.00/100
Typical Length
-
Depth Zone
demersal

📖 Overview

Facultative air-breathing in the genus ; Collected mainly from small gravelly riffles in small streams. This fish appears to be cryptic .

Scientific Name
Galaxias macronasus
Authority
McDowall & Waters, 2003
Habitat
Freshwater
Climate
Temperate
Body Shape
Elongated
IUCN Status
CR
Max Length
7 cm
Trophic Level
3.1
Resilience
High
Vulnerability
14.00/100
Migration
Non-migratory
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal soft rays (total): 7 - 9; Anal soft rays: 7 - 11; Vertebrae: 47 - 51. Distinguished from all other congeners in New Zealand in having only 4-6 pelvic fin rays and only 11-14 principal caudal rays (Galaxias pullus has 14 principal caudal rays, but has 7 pelvic fin rays, and is much more stoutly built; Galaxias cobitinis has only 5 pelvic fin rays, usually has 15 principal caudal fin rays, and has a distinctly protruding lower jaw). This species has distinctly rounded snout when viewed from both dorsal and lateral perspective .: elongated.

🌀 Behaviour

Behavioural data for Bignose galaxias is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

🌍 Habitat & Distribution

Freshwater; demersal; non-migratory . Temperate South Island, New Zealand.

🌿 Ecology

Zone Preferences
💧 Freshwater ⬇️ Benthic
Migration
Non-migratory
Trophic Level
3.1±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.0049 × L3.12 (TL)
Max TL
7cm
Dorsal Rays
8
Anal Rays
9
Vertebrae
49

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Critically Endangered
Assessment Date
2014

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
14.00/100
Low vulnerability
Trophic Level
3.1
Predator
Body Shape
Elongated
Climate Zone
Temperate
Described By
McDowall & Waters, 2003

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