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🌊 Marine Least Concern 🌡️ Temperate

Allen's chromis

Pycnochromis alleni Randall, Ida & Moyer, 1981
Max Length
6.5 cm
Max Weight
-
Lifespan
-
Trophic Level
3.4
Depth
10–30 m
Climate
Temperate
Resilience
High
Vulnerability
16.00/100
Typical Length
-
Depth Zone
reef

📖 Overview

Adults inhabit coral or rocky outer reefs . Diurnal species . Oviparous, distinct pairing during breeding . Eggs are demersal and adhere to the substrate . Males guard and aerate the eggs .

Scientific Name
Pycnochromis alleni
Authority
Randall, Ida & Moyer, 1981
Habitat
Marine
Climate
Temperate
Body Shape
Short and / or deep
IUCN Status
LC
Max Length
6.5 cm
Depth Range
10–30 m
Trophic Level
3.4
Resilience
High
Vulnerability
16.00/100
Migration
Non-migratory
Salinity
30–40 ppt

🔬 Taxonomy

Genus
Pycnochromis
Pycnochromis
Species
Allen's chromis
Pycnochromis alleni

🐟 Physical Description

Dorsal spines (total): 11 - 12; Dorsal soft rays (total): 12 - 13; Anal spines: 2; Anal soft rays: 12 - 13. Overall color is brown with a prominent black spot on the base of the pectoral fin. Caudal fin and peduncle white.: short and / or deep; Cross section: compressed.

🌀 Behaviour

Behavioural data for Allen's chromis is currently being reviewed.

🦐 Diet

aquatic invertebrates
small fish
algae
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 10 - 30 m . Temperate Northwest Pacific: Miyake-jima, Bonin Islands of Japan and south to Taiwan.

🌿 Ecology

Zone Preferences
🌊 Marine 🪸 Reef Associated
Migration
Non-migratory
Trophic Level
3.4±0.45

📐 Morphometrics

Length–Weight Relationship: W = 0.02089 × L2.98 (TL)
Max TL
6.5cm
Dorsal Spines
12
Dorsal Rays
13
Anal Spines
2
Anal Rays
13

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Least Concern
Assessment Date
2010

📊 Population Risk & Fisheries

Population Resilience
High
Minimum doubling time
Fishing Vulnerability
16.00/100
Low vulnerability
Trophic Level
3.4
Predator
Body Shape
Short and / or deep
Climate Zone
Temperate
Described By
Randall, Ida & Moyer, 1981

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