Ariopsis seemanni
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The Shark Catfish, more accurately known as the Columbian Shark Catfish, is a sleek, fast-swimming species admired for its shark-like silhouette and active schooling behavior. Its constant motion and silvery coloration make it an eye-catching addition to large, open aquariums designed for active fish. Columbian Shark Catfish have a streamlined, torpedo-shaped body with a metallic silver base color contrasted by a dark dorsal fin, forked tail, and black edging on the fins. They possess long barbels around the mouth, typical of catfish, which are used to sense food. Adults commonly reach 12–14 inches, with some individuals growing larger in spacious systems. Their size and speed mean they quickly outgrow smaller aquariums.
Shark Catfish require large aquariums of at least 180 gallons for adults, with long horizontal swimming space and strong filtration to handle their waste output. They should be kept in brackish water as juveniles and gradually transitioned to full marine conditions as they mature. Open swimming areas are essential, with rockwork kept minimal and securely placed. They are peaceful and compatible with other medium to large, non-aggressive fish that tolerate similar salinity. Due to their size, activity level, and schooling needs, Columbian Shark Catfish are best suited for experienced aquarists with large, stable systems.
Shark Catfish are omnivorous scavengers. In the wild, they feed on crustaceans, small fish, insects, and organic matter. In captivity, they readily accept sinking pellets, frozen mysis shrimp, krill, chopped seafood, and occasional algae-based foods. Because they are enthusiastic feeders, care should be taken to avoid overfeeding and to ensure tank mates also receive adequate food.