The Oxydoras niger, also known as the Ripsaw Catfish or Giant Talking Catfish, is an impressive armored catfish species from the Amazon Basin. Known for its bony plates along the body and distinctive elongated shape, this fish is a collector’s favorite and a true showpiece for large freshwater aquariums.

Juveniles are usually 8–10 cm when sold, but they can grow to an astonishing 90–100 cm (36–39 inches) as adults, requiring a massive aquarium setup. This species is extremely hardy, peaceful, and nocturnal, making it suitable for experienced hobbyists with large community tanks or dedicated setups.

✅ Key Features

• Size: 8–10 cm juvenile; adults can grow up to 90–100 cm

• Temperament: Peaceful bottom-dweller

• Care Level: Advanced (requires large tank and strong filtration)

• Lifespan: 15+ years with proper care

• Special Trait: Armored body with sharp “ripsaw” plates and unique look

Care Guide for Oxydoras niger

✅ Tank Requirements

• Minimum Tank Size: 1,000 liters (264 gallons) or more for adults

• Aquascape: Sandy substrate, large driftwood, and hiding spots

• Filtration: Extremely powerful filtration (canister or sump) to manage heavy waste load

• Lighting: Dim or subdued – species is nocturnal and prefers low light

• Lid Required: Heavy lid as large catfish can jump or displace covers

✅ Water Parameters

• Temperature: 24°C – 28°C (75°F – 82°F)

• pH Level: 6.0 – 7.5

• Water Hardness: Soft to moderately hard

• Maintenance: Weekly water changes of 30–40% to keep water clean

Oxydoras niger thrives in soft, well-oxygenated water with moderate current, mimicking its Amazon habitat.

✅ Feeding Habits

The Ripsaw Catfish is an omnivore that feeds on a variety of sinking foods.

• Recommended Diet:

  • Sinking carnivore pellets

  • Frozen or live foods (shrimp, worms, small crustaceans)

  • Fresh vegetables (zucchini, cucumber)

  • Occasional fruits for dietary variety

Feed at night or in dim lighting, as they are nocturnal feeders.

✅ Tank Mates

Oxydoras niger is peaceful, but due to its size, it should only be housed with large, robust species.

Compatible Tank Mates:

• Large South American cichlids (Oscar, Severum)

• Arowanas

• Other large catfish species (Pimelodids, Doradids)

• Pacu and Silver Dollar species

Avoid small or delicate fish that may be accidentally eaten or stressed.

✅ Behavior & Personality

• Behavior: Mostly nocturnal, calm, and reclusive during the day

• Special Feature: Produces a “grunting” sound by grinding its pectoral spines – hence the name “Talking Catfish”

• Activity: Active at night, foraging along the substrate

Why Choose Oxydoras niger?

• Rare and exotic armored catfish species

• Peaceful temperament despite large size

• Adds a dramatic, prehistoric look to large aquariums

• A true centerpiece for experienced fishkeepers

✅ Perfect for monster fish setups and public aquariums
✅ A collector’s gem for those who love unique armored catfish