Wels Catfish vs Whale Shark
Silurus glanis compared with Rhincodon typus
Taxonomy & Classification
| Attribute | Wels Catfish | Whale Shark |
|---|---|---|
| Scientific Name | Silurus glanis | Rhincodon typus |
| Order | Siluriformes | Orectolobiformes |
| Family | Siluridae | Rhincodontidae |
| Conservation Status | Least Concern | Endangered |
Physical Traits
| Attribute | Wels Catfish | Whale Shark |
|---|---|---|
| Max Length | 500.0 cm | 1800.0 cm |
| Max Weight | 300.0 kg | 21500.0 kg |
| Color | 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. | Dark gray to blue-gray back covered with a distinctive checkerboard grid of pale white or cream spots and transverse stripes; belly white; the unique spot pattern is unique to each individual. |
Habitat & Environment
| Attribute | Wels Catfish | Whale Shark |
|---|---|---|
| Water Type | Brackish | Saltwater |
| Depth Range | 0-30m | 0-1928m |
| Geographic Range | 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 … | Pantropical in open oceanic and coastal waters between 30°N and 35°S. Aggregates seasonally at feeding sites including Ningaloo Reef in Western Australia, the Gulf of … |
| Habitat | 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 … | Neritic, coral reefs |
Fishing Information
| Attribute | Wels Catfish | Whale Shark |
|---|---|---|
| Game Fish | Yes | No |
| Fight Rating | 9/10 | — |
| World Record | — | — |
| Mercury Level | — | — |
Cuisine & Edibility
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.
Whale Shark
Endangered species — consumption is strongly discouraged and illegal in many countries. Historically consumed in parts of Asia; now internationally protected under CITES Appendix II.
Species Overview
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.
Whale Shark
The whale shark is the largest living fish species, reaching lengths of up to 18 meters. Despite its enormous size, it is a gentle filter feeder that consumes plankton, fish eggs, and small fish by swimming with its wide mouth open.