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💧 Freshwater Endangered 🌡️ Tropical

Pachypanchax Varatraza

Pachypanchax varatraza Loiselle, 2006
Max Length
6.8 cm
Max Weight
-
Lifespan
-
Trophic Level
3.6
Depth
-
Climate
Tropical
Resilience
-
Vulnerability
10.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Found in a wide range of habits: stream flowing under relatively intact forest cover at an altitude of 70 m above sea level consisting of a series of quiet pools with clay/sand bottoms, interspersed with short stretches of flowing water over sand/ gravel bottoms and with very turbid water; and stream flowing through modified low-altitude rain forest at an altitude of 30 m above sea level consisting of clay/sand bottom, interspersed with patches of bedrock with clear water and moderate current . Feeds on terrestrial and aquatic insects .

Scientific Name
Pachypanchax varatraza
Authority
Loiselle, 2006
Habitat
Freshwater
Climate
Tropical
IUCN Status
EN
Max Length
6.8 cm
Trophic Level
3.6
Vulnerability
10.00/100
Salinity
0–0.5 ppt

🐟 Physical Description

Dorsal soft rays (total): 11 - 13; Anal soft rays: 17 - 19. Distinguished from Pachypanchax playfairii in lacking raised dorsolateral squamation and in details of its color pattern. Males without rows of discrete red dots on the flanks and red edging to the vertical fins; female lack any sort of black markings on the dorsal fin. Has the shortest pectoral fins (13.4% SL) among Malagasy Pachypanchax. Differs from Pachypanchax sakaramyi and Pachypanchax sparksorum by the absence of pectoral scales of reduced size. Can be distinguished from Pachypanchax omalonotus by the rounded dorsal and anal fins of males and their lack of discrete metallic gold spangling on the flanks; and also differs from the remaining Malagasy congeners by lack of iridescent white edging to, or darker submarginal banding on, the vertical fins .

🌀 Behaviour

Behavioural data for Pachypanchax Varatraza 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. Tropical

🌿 Ecology

Zone Preferences
💧 Freshwater
Trophic Level
3.6±0.5
Food Items

terrestrial and aquatic insects (Ref

📐 Morphometrics

Length–Weight Relationship: W = 0.00389 × L3.12 (TL)
Max TL
6.8cm
Dorsal Rays
12
Anal Rays
18

🌡️ Water Parameters & Tolerance

Salinity Range
0–0.5ppt

🛡️ Conservation Assessment

IUCN Category
Endangered
Assessment Date
2016

📊 Population Risk & Fisheries

Fishing Vulnerability
10.00/100
Low vulnerability
Trophic Level
3.6
Predator
Climate Zone
Tropical
Described By
Loiselle, 2006

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