Astronotus crassipinnis

Introduction
Astronotus crassipinnis is a close relative to the famous
Oscar fish Astronotus ocellatus.
The name crassipinnis is derived from the Latin words crassus and pinna which means "fat"
and "fish" respectively.
Taxonomy
Crassipinnis are member of Genus Astronotus which is placed in subfamily Astronotinae.
Crassipinnis was scientifically described by Heckel in 1840 and given the name Acara crassipinnis,
but is now considered a member of the genus Astronotus.
Description
Astronotus crassipinnis reaches a standard length of 9" , compared
to 18" for Astronotus ocellatus
Both species are known to exhibit a variable bar pattern, but Crassipinnis is
overall darker than Oscar and its anterior most light vertical bar is located more
anterior than on an Oscar.
The area where one would find the first light bar on an Oscar is instead decorated with two more or
less well-separated dark vertical bars on a Crassipinnis.
In addition to this, Crassipinnis does not have the two eye-spots along the base of its dorsal
fin that adorns the western Amazonian Oscar.
Distribution & Habitat
Astronotus crassipinnis is found are Rio Paraguay, Villa Maria and Caisara,
Rio Guaporé close to Matogrosso, Rio Negro, and Rio Branco.
The species inhabits the Bolivian parts of the Amazon and the Rio Madre de Dios drainage in Peru,
plus the Rio Paraná basin in the Rio Paraguay drainage in Paraguay and Brazil.
Sexual Dimorphism
Astronotus crassipinnis is monomorphic. i.e male and females are alike, just like its close cousin Astronotus ocellatus.
Feeding
Astronotus crassipinnis is carnivorous by nature and may be fed prepared
fish food designed for large carnivorous fish, crayfish, worms, and insects (
such as flies or grasshoppers).
Feeding live foods may increase the rate of growth but also may cause endoparasites.
Poultry and/or mammalian flesh, including beef heart, should not be fed long term as these
fatty foods will contribute to fatty liver disease.
Live feeder fish can be given, but fish such as goldfish and rosy red feeder minnows should not be
fed.
These contain an enzyme (thiaminase) within their flesh which binds vitamin B1, leading to deficiency.
Keeping in Aquarium
Tank Size:
Compared to the popular Oscar, very little is known about Astronotus crassipinnisand the information
that does exist is often vague or conflicting.
It is still rare within the hobby and seldom exported from South America, and the regions in
which it lives are far from thoroughly explored.
However , it is important to have or be prepared to eventually get a large aquarium.
It is true that the largest scientifically measured Crassipinnis was 24 cm / 9.4 in, but this doesn't
mean that it must be impossible for this species to grow any larger there might be even larger
specimens lurking in South America unknown to science.
Since we still know so little about Astronotus crassipinnis it is best to play it safe and assume that
it might one day become as large as an Oscar.
Also keep in mind that the comfortable life in a well-kept aquarium can make some species grow much
larger than they would in the wild.
Filtration:
Since Astronotus crassipinnis is quite a messy eater and produces a
lot of waste, powerful mechanical and biological filtration is typically necessary
even in large and under-stocked aquariums.
Even with powerful filtration, it is important to keep an eye on the water quality.
Substrate & Decor:
As the Astronotus crassipinnis lives in South America the
layout of aquarium should mimic that environment.
Mangrove roots or similar is a good idea since roots will provide your fish with dark and sheltered
spots for resting.
Live plants floating on the surface will also be highly appreciated and make your fish feel more at home.
Planted plants can also be used, but your Crassipinnis may uproot them so ideally go for robust species.
Water parameters:
Astronotus crassipinnis needs 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 21-28C / 70-83F.
If you decide to keep the water in the upper part of the range, don't forget that warm
water holds less oxygen than cooler water.
If your filtration system isn't enough to keep the oxygen level up you can get one or several air stone.
Breeding
Astronotus crassipinnis has been observed, in times of danger, to
store brood in its mouth, possibly for protection, in a manner reminiscent of mouth brooding
Geophaginae cichlids.
This behavior, however, has not yet been observed in A. ocellatus.
Species Snapshot
Species Card
Particulars | Details |
---|---|
Scientific Name | Astronotus crassipinnis |
Common Name | |
Genus | Astronotus |
Subfamily | Astronotinae |
Geographical Origin | Near Rio Paraguay, Villa Maria and Caisara, Rio Guaporé close to Matogrosso, Rio Negro, and Rio Branco |
Diet | Carnivore |
Gender Differences | Mono morphic |
Breeding | Substrate Spawner |
Temperament | Aggressive |
Con Specific Temperament | Aggressive |
Water hardness | Soft, ph range: 6-7, dH range: 5-19 |
Difficulty Level in Aquariums |
Morphometric Data
Particulars | Details |
---|---|
Total Length(inches) | 8.30 |
Standard Length(inches) | 6.38 |
Measurements as % of Total Length
Particulars | Details |
---|---|
Body Depth | 44.70 % |
Head length | 32.70 % |
Pre Dorsal length | % |
Pre Pectoral length | % |
Pre Anal length | % |
Pre Pelvic length | % |
Caudal Peduncle Depth | 17.30 % |
Caudal Peduncle Length | 7.30 % |
Fork length | % |
Length of Last Dorsal Fin Spine | 11.90 % |
Pectoral Fin Length | 33.70 % |
Pelvic Fin Length | 29.60 % |
Measurements as % of Head Length
Particulars | Details |
---|---|
Head Width | 19.10 % |
Snout length | 6.90 % |
Eye diameter | 8.90 % |
Pre Orbital Length | % |
Inter Orbital Width | 13.20 % |
Pre Orbital Depth | % |
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