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💧 Freshwater Critically Endangered 🌡️ Tropical

Lake Furnusu rainbowfish

Melanotaenia mairasi Allen & Hadiaty, 2011
Max Length
5.4 cm
Max Weight
-
Lifespan
-
Trophic Level
2.9
Depth
0–3 m
Climate
Tropical
Resilience
High
Vulnerability
27.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Specimens were collected adjacent to a rocky shore among aquatic vegetation and submerged Pandanus roots. Except for the holotype, only juveniles were collected, but adult fish were observed among dense vegetation at depths below 2 to 3 m. Other species present in the lake were provisionally identified as follows: Neosilurus brevidorsalis (Plotosidae), Craterocephalus fistularis (Atherinidae), Mogurnda new species (Eleotridae), and Oxyeleotris nullipora (Eleotridae) .

Scientific Name
Melanotaenia mairasi
Authority
Allen & Hadiaty, 2011
Habitat
Freshwater
Climate
Tropical
IUCN Status
CR
Max Length
5.4 cm
Depth Range
0–3 m
Trophic Level
2.9
Resilience
High
Vulnerability
27.00/100
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal spines (total): 4 - 6; Dorsal soft rays (total): 11 - 13; Anal spines: 1 - 2; Anal soft rays: 16 - 19. This species of the maccullochi group of rainbowfishes is distinguished by the following set of characters: D IV-VI-I,11 to 13 (usually 11); A I-II,16–19 (usually I,18-19); pectoral rays 12-14 (usually 13-14); lateral scales 32-34 (usually 34); gill rakers on lower limb of first gill arch 15-17. Colour in life brownish dorsally and white ventrally with mid-lateral blackish stripe from eye to caudal-fin base, narrow red stripe between each scale row of body, and orange scale margins .Cross section: compressed.

🌀 Behaviour

Behavioural data for Lake Furnusu rainbowfish is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Oviparous
Spawning Season
spring
Spawn Location
Substrate
Fertilization
External

🌍 Habitat & Distribution

Freshwater; benthopelagic; depth range 0 - 3 m . Tropical West Papua in Indonesia.

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
2.9±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.01122 × L3.04 (TL)
Max TL
5.4cm
Dorsal Spines
5
Dorsal Rays
12
Anal Spines
2
Anal Rays
18

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Critically Endangered
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
27.00/100
Low vulnerability
Trophic Level
2.9
Omnivore / Planktivore
Climate Zone
Tropical
Described By
Allen & Hadiaty, 2011

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