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💧 Freshwater Least Concern 🐠 Aquarium 🌡️ Tropical

Fluviphylax Obscurus

Fluviphylax obscurus Costa, 1996
Max Length
1.7 cm
Max Weight
-
Lifespan
-
Trophic Level
2.5
Depth
-
Climate
Tropical
Resilience
-
Vulnerability
10.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Feeds on autochthonous micro-algae and detritus in a swamp (Urubaxi, Brazil) and on allochthonous invertebrates and detritus in an island lake (Buiú-Açu, Brazil).

Scientific Name
Fluviphylax obscurus
Authority
Costa, 1996
Habitat
Freshwater
Climate
Tropical
Body Shape
Elongated
IUCN Status
LC
Max Length
1.7 cm
Trophic Level
2.5
Vulnerability
10.00/100
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal soft rays (total): 5 - 6; Anal soft rays: 7 - 8; Vertebrae: 27. Absence of an expanded upper tip of the cleithrum, a plesiomorphic condition that distinguishes this species from its congeners; anterior portion of supraorbital, postorbital and upper portion of preopercular canals closed; pelvic fin of males short, tip reaching base of third anal-fin ray; anal fin of males rounded and short, tip reaching a vertical through middle of dorsal-fin base; mesethmoid rounded; anterodorsal process of opercle short; ventral process of posttemporal elongate; branchiostegal rays 5; rostral cartilage present.: elongated.

🌀 Behaviour

Behavioural data for Fluviphylax Obscurus is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
detritus

🥚 Reproduction

🐣 Viviparous 🤰 Viviparous
Spawning Season
spring
Spawn Location
Substrate
Fertilization
Internal

🌍 Habitat & Distribution

Freshwater; benthopelagic. Tropical South America: Upper Rio Negro basin.

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
2.5±0.19
Food Items

autochthonous micro-algae and detritus in a swamp (Urubaxi, Brazil) and on allochthonous invertebrat

📐 Morphometrics

Length–Weight Relationship: W = 0.00525 × L3.09 (TL)
Max TL
1.7cm
Dorsal Rays
6
Anal Rays
8
Vertebrae
27

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2018

📊 Population Risk & Fisheries

Fishing Vulnerability
10.00/100
Low vulnerability
Trophic Level
2.5
Omnivore / Planktivore
Body Shape
Elongated
Climate Zone
Tropical
Described By
Costa, 1996

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