Giant Sword Minnow (Macrochirichthys macrochirus)

Giant Sword Minnow

(Macrochirichthys macrochirus)

The Giant Sword Minnow is a unique freshwater predator known for its long, streamlined body, reflective silver coloration, and distinctive sword-like appearance. Native to Southeast Asia, this river-dwelling species is built for speed and spends much of its time cruising open water in search of food.

Despite its predatory nature, it is generally peaceful toward fish too large to be eaten and can make an impressive display fish in large aquariums. Its unusual shape and active swimming behavior make it a standout species for experienced hobbyists.

Max Size

• Up to 20–24 inches in captivity
• Can grow larger under ideal conditions

Tank Size

• Minimum: 240 gallons
• Recommended: 300+ gallons for adults
• Requires substantial open swimming space

Diet

• Carnivorous
• Eats fish, shrimp, insects, and other meaty foods
• Readily accepts frozen fish, shrimp, and high-quality carnivore pellets

Water Parameters

• Temperature: 72–82°F
• pH: 6.0–7.5
• Prefers clean, well-oxygenated water

Temperament

• Generally peaceful with similarly sized fish
• Will consume smaller tankmates
• Best kept with large, non-aggressive species

Aquarium Setup

• Large open swimming areas are essential
• Moderate current is appreciated
• Secure lid required, as this species can jump when startled

With its sleek profile, impressive adult size, and active nature, the Giant Sword Minnow (Macrochirichthys macrochirus) is a fascinating species that thrives in large river-style aquariums and makes a truly unique centerpiece fish.