Sunday,26 September 2021, 6 : 08 AM

Aequidens diadema

Aequidens diadema
Image Credit: Stawikowski, Rainer


Aequidens diademais medium sized fish of about 4.8" found in South America, Brazil.


(Click for details of Cichlid taxonomy)

Aequidens diadema was first described by Heckel in 1840, and has been placed in Genus Aequidens and subfamily Cichlasomatinae.
The Genus "Aequidens" is derived from Latin words, equips+equal+dens(teeth), which roughly translates to "Fish with equal teeth".

Distribution & Habitat

Aequidens diadema is found in Amazon River basin, upper Negro River, Orinoco River basin, in tributaries of the Orinoco River in Colombia and Venezuela.

Keeping in Aquarium

Aequidens diadema has not been studied in detail yet, and not much information is available on its aquarium requirements.
They need soft water and acidic water with a pH of 6.5-6.9.
The species live in tropical South American rivers and the recommended water temperature in the aquarium is 21-28°C / 70-83°F.

Species Snapshot

Species Card

Particulars Details
Scientific Name Aequidens diadema
Common Name Royal acara
Genus Aequidens
Subfamily Cichlasomatinae
Geographical Origin South America: Amazon River basin, in the upper Negro River; Orinoco River basin,
Diet Omnivore
Gender Differences Mono morphic
Breeding Substrate Spawner
Temperament Peaceful
Con Specific Temperament Mildly Aggressive
Water hardness Soft,pH range: 7; dH range: 15
Difficulty Level in Aquariums 2

Morphometric Data

Particulars Details
Total Length(inches)
Standard Length(inches)

Measurements as % of Total Length

Particulars Details
Body Depth  %
Head length  %
Pre Dorsal length  %
Pre Pectoral length  %
Pre Anal length  %
Pre Pelvic length  %
Caudal Peduncle Depth  %
Caudal Peduncle Length  %
Fork length  %
Length of Last Dorsal Fin Spine  %
Pectoral Fin Length  %
Pelvic Fin Length  %

Measurements as % of Head Length

Particulars Details
Head Width  %
Snout length  %
Eye diameter  %
Pre Orbital Length  %
Inter Orbital Width  %
Pre Orbital Depth  %

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