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🌊 Marine Least Concern 🐠 Aquarium 🌡️ Tropical

Western gregory

Plectroglyphidodon obreptus Whitley, 1948
Max Length
12 cm
Max Weight
-
Lifespan
-
Trophic Level
2
Depth
2–10 m
Climate
Tropical
Resilience
High
Vulnerability
28.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Adults occur close to shore in rocky or dead reef areas where visibility is often reduced due to silting and wave action. Territorial, they maintain and 'weed' filamentous algae patches growing on dead coral . Oviparous, distinct pairing during breeding . Eggs are demersal and adhere to the substrate . Males guard and aerate the eggs .

Scientific Name
Plectroglyphidodon obreptus
Authority
Whitley, 1948
Habitat
Marine
Climate
Tropical
Body Shape
Short and / or deep
IUCN Status
LC
Max Length
12 cm
Depth Range
2–10 m
Latitude
30°S – 30°N
Trophic Level
2
Resilience
High
Vulnerability
28.00/100
Migration
Non-migratory
Salinity
30–40 ppt

🐟 Physical Description

Dorsal spines (total): 13; Dorsal soft rays (total): 14 - 16; Anal spines: 2; Anal soft rays: 12 - 14. Diagnosis: Body and median fins generally brown to nearly black; body paler ventrally; fins grading to smoky gray distally. Margin of scales on sides with blackish streak, appearing as series of transverse bands; few small blue spots scattered on head and sides. Pelvic and anal fins bright blue anteriorly. Lips dusky brown . Body depth 1.7-2.2 in SL .: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Western gregory is currently being reviewed.

🦐 Diet

algae
aquatic plants
detritus

🥚 Reproduction

🐣 Oviparous
Spawn Location
Demersal

Oviparous, distinct pairing during breeding . Eggs are demersal and adhere to the substrate . Males guard and aerate the eggs .

🌍 Habitat & Distribution

Marine; reef-associated; non-migratory; depth range 2 - 10 m . Tropical; 30°N - 30°S north of Abrolhos Islands; reaching eastward along the northern margin of the tropical Indian Ocean to Sri Lanka and India.

🌿 Ecology

Zone Preferences
🌊 Marine 🪸 Reef Associated
Migration
Non-migratory
Trophic Level
2

📐 Morphometrics

Length–Weight Relationship: W = 0.01995 × L2.99 (TL)
Max TL
12cm
Dorsal Spines
13
Dorsal Rays
15
Anal Spines
2
Anal Rays
13

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2023

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
28.00/100
Low vulnerability
Trophic Level
2
Omnivore / Planktivore
Body Shape
Short and / or deep
Climate Zone
Tropical
Latitude Range
30°N – 30°S
Described By
Whitley, 1948

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