Overview
The Columbian Shark Catfish (Ariopsis seemanni) is a intermediate brackish species known for its silver-gray, black fins coloration. Needs brackish to marine water as adult. Mid.
Origin & Appearance
Origin: Central/South America.
Colors: Silver-Gray, Black fins.
Body Shape: Fusiform (torpedo/streamlined). Typical adult dimensions: 35.0 x 6.3 x 10.5.
Sexual Dimorphism: Minimal.
Tank & Water Requirements
| Min Tank Size | 79 gallons |
| Temperature | 72–79°F |
| pH Range | 7–8 |
| Water Hardness (GH) | 10-20 |
| Bioload | high |
| Oxygen Demand | high |
| Plant Safe | mostly |
| Aquarium Position | Mid |
Behavior & Activity
Active mid-level schooling swimmer; continuous restless swimming; whiskers probe forward; migratory instinct
Speed: 50/100Aggression: 3/10diurnalSchooling (4+)
Breeding
Difficult; needs brackish-to-marine as adult
Common Diseases
💊 Ich💊 needs salt transition
Expert Notes
Needs brackish to marine water as adult