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Brown Ghost Knifefish
Apteronotus leptorhynchus
Animalia›Chordata›Actinopterygii›Gymnotiformes›Apteronotidae
📍 Amazon & Orinoco Basins, South America
Slender, electric knifefish with a long beak-like snout and wave-like undulating motion. Generates a weak electrical field for orientation and communication. Smaller and more manageable than the Black Ghost Knifefish.
Care Guide
Diet
Brown Ghost Knifefish are strict carnivores requiring live or frozen foods such as bloodworms, brine shrimp, small fish, and insect larvae. Feed once daily with portions they can consume in a few minutes. They may eventually accept high-quality sinking carnivore pellets, but live food should remain a dietary staple.
Behavior
Nocturnal and reclusive, this species uses a weak electrical field for navigation and communication rather than vision. They are semi-aggressive toward smaller fish and other knifefish, preferring to hide among plants and decorations during the day. Most active during dawn, dusk, and nighttime hours.
Breeding
Breeding in captivity is extremely rare and poorly documented. They require very specific conditions including large tanks, precise water parameters, and compatible pairs, which are difficult to establish. Hobbyist breeding is not recommended.
Tank Mates
Small, peaceful bottom-dweller that won't trigger predatory behavior and shares similar water preferences
Peaceful dwarf cichlid that occupies different zones and tolerates slightly acidic conditions
Mid-water schooling fish that avoids the bottom zone where knifefish hunt
Nocturnal bottom-dweller with similar activity patterns and compatible water chemistry
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, scratching against decorations, labored breathing
Raise temperature to 28-30°C gradually, perform 25% water changes daily, use ich-specific medication if needed; maintain excellent water quality
Bacterial Infections
Torn fins, sores on body, lethargy, loss of appetite, cloudy eyes
Perform frequent partial water changes, improve water quality, use antibiotic medication if severe; isolate if possible
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges
Improve water quality with frequent changes, remove sharp decorations, use fin rot medication; ensure adequate filtration
Parasitic Infections
Excessive slime coating, rapid gill movement, scratching behavior, weight loss
Use antiparasitic medication, perform water changes, quarantine if possible; maintain stable water parameters
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Quick Facts
- pH
- 5.5–7.5
- diet
- carnivore/live food
- maxSize
- 8 inches
- minTankSize
- 40 gallons
- temperature
- 72–82°F (22–28°C)
Temperature
72–82°F
22–28°C