Species learning profile
Oscar
Astronotus ocellatus
Oscar (Astronotus ocellatus) is a freshwater fish associated with river habitat in South America. A tail eyespot may divert attacks away from the head.
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At a glance
- Agua
- Agua dulce
- Habitat
- Río
- Longitud máxima
- 46 cm
- Distribución
- Sudamérica
- Familia
- Cichlidae
- Orden
- Cichliformes
Observe
How to identify Oscar
- A tail eyespot may divert attacks away from the head.
- Guide context: river habitat in South America.
- Reported maximum length: 46 cm — up to about the length of a guitar. Maximum is not the same as typical adult size.
Field note: color, size, and markings can change with age, sex, season, depth, and lighting. Use several traits together.
Place and pattern
Where it lives—and how it behaves
Habitat and range
This species is associated with river habitat across South America. Flow, seasonal floods, connected side channels, and access to spawning reaches all shape its river habitat.
Behavior
Recognizes territory and guards young
Food-web connections
What it eats and why it matters
Diet
Crustaceans, insects, and fish.
Ecological role
An adaptable predator in floodplain habitats.
Remember
One fact worth keeping
Oscar puede medir unos 46 cm y suele encontrarse cerca de Río.
Think like a conservationist
A conservation lens
River fish depend on connected water. Dams, blocked migrations, pollution, and altered flow can matter even when the channel still looks wet.
This habitat lens is not a current population-status assessment. Status can differ among regions and change as new assessments are published; follow the reference links and local fisheries or wildlife agencies for current decisions.
Recall
Quick knowledge check
Which habitat is most closely associated with Oscar in this guide?
Keep exploring
References and further reading
Fishdle summarizes stable identification and ecology concepts in plain language. Taxonomy and population knowledge continue to change, so use primary assessments and regional authorities for conservation or management decisions.
Make connections