Monday,26 July 2021, 5 : 10 PM

Chaetobranchopsis orbicularis

Chaetobranchopsis orbicularis
Image Credit: wikipedia


Chaetobranchopsis orbicularis is a medium sized fish with a standard length of 5 " and total length of 8 ".


Chaetobranchopsis orbicularis was first described by Steindachner in 1875, and is placed in Genus Chaetobranchopsis .


Not much information is available about this fish, it is most probably a filter feeder.

Distribution & Habitat

It is found in South America: Amazon River basin, along the Amazon River from the mouth or the Negro River to Marajó Island, and in Amapá, Brazil.

Sexual Dimorphism

They are mono morphic in nature, i.e male and female are alike


Chaetobranchopsis orbicularis has long dense branchiospines suggest microphagous and planktophagous feeding, possibly including small crustaceans. It possesses weak teeth, indicating that it is not a predator. This makes feeding a bit of problem.

Keeping in Aquarium

Tank Size:

Not much information is available on its being kept in aquariums.
However as it is a medium sized fish a tank of about 400 lit can be used.

Tank Mates:

Although it is peaceful fish with mild aggression towards its own species, it should be kept in a species only tank due to its unique diet habits.


They lay eggs on substrate, however not much information is available on its breeding.

Species Snapshot

Species Card

Particulars Details
Scientific Name Chaetobranchopsis orbicularis
Common Name Acara tucuma.
Genus Chaetobranchopsis
Subfamily Astronotinae
Geographical Origin Amazon River basin
Diet Probably a filter feeder
Gender Differences Mono morphic
Breeding Substrate Spawner
Temperament Peaceful
Con Specific Temperament Mildly Aggressive
Water hardness Soft, ph range: 6-7, dh Range: 1-15
Difficulty Level in Aquariums

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  %

How to use the Web site presents articles on various interests to aquarists. Following general articles are provided.

Articles related to technical aspect of Fish keeping :

Articles related to Fish Groups :

Articles related to Fish Sub Families :

Articles related to Fish Genus :

Articles related to Fish Species :

and many more