Oscar vs Wels Catfish
Astronotus ocellatus compared with Silurus glanis
Taxonomy & Classification
| Attribute | Oscar | Wels Catfish |
|---|---|---|
| Scientific Name | Astronotus ocellatus | Silurus glanis |
| Order | Cichliformes | Siluriformes |
| Family | Cichlidae | Siluridae |
| Conservation Status | Least Concern | Least Concern |
Physical Traits
| Attribute | Oscar | Wels Catfish |
|---|---|---|
| Max Length | 45.0 cm | 500.0 cm |
| Max Weight | 1.6 kg | 300.0 kg |
| Color | Dark olive-brown to blackish body with irregular wavy orange-red markings forming a marbled or reticulated pattern; prominent black ocellus with orange ring at the upper tail base. | Dark olive-green to slate-gray back with irregular mottled marbling of darker blotches; flanks grade to olive-yellow; scaleless smooth skin; belly pale cream to yellowish-white; head broad and flat. |
Habitat & Environment
| Attribute | Oscar | Wels Catfish |
|---|---|---|
| Water Type | Freshwater | Brackish |
| Depth Range | — | 0-30m |
| Geographic Range | Native to the Amazon and Orinoco river basins in South America, including Peru, Colombia, and Brazil. Inhabits slow, deep, turbid rivers, flooded forests, and large … | Native to large river systems and lakes of central and eastern Europe from the Rhine basin east to the Caspian and Aral sea drainages. Introduced … |
| Habitat | Slow-moving rivers and floodplains of the Amazon and Orinoco basins, South America. Warm, murky water (22-28°C, pH 6-8). Inhabits areas with submerged logs and dense … | Large rivers, lakes, and reservoirs across Europe and Asia (Volga, Danube, Rhine, Ob). Inhabits deep, slow-moving freshwater with soft substrates. Tolerates turbid water (15-25°C). Highly … |
Aquarium Suitability
| Attribute | Oscar | Wels Catfish |
|---|---|---|
| Min Tank Size | 280 L | — |
| Temperature | 22-25 | — |
| pH Range | 6.0-8.0 | — |
| Care Level | Moderate | — |
| Temperament | Aggressive | — |
Fishing Information
| Attribute | Oscar | Wels Catfish |
|---|---|---|
| Game Fish | Yes | Yes |
| Fight Rating | — | 9/10 |
| World Record | — | — |
| Mercury Level | — | — |
Cuisine & Edibility
Oscar
Not consumed — popular ornamental cichlid kept for its bold patterning and personality; occasionally eaten in parts of South America but primarily an aquarium species.
Wels Catfish
Fatty, soft flesh with a mild, slightly sweet flavor; quality improves from cold, clean water fish. Popular in Central European cuisines — commonly smoked, fried, or braised with vegetables.
Species Overview
Oscar
The oscar is a large, intelligent cichlid native to the Amazon basin. Known for its dog-like personality, it can recognize its owner and may beg for food. Oscars rearrange their tank decor and require spacious aquariums with robust filtration.
Wels Catfish
The wels catfish is the largest freshwater fish in Europe, capable of exceeding 5 meters. Found in large rivers and lakes across the continent, it has been documented beaching itself to catch pigeons. It can live over 80 years.