Knife fish are a group of elongated, laterally compressed freshwater fish, named for their knife-like shape. They are known for their unique swimming style and nocturnal habits.
Scientific Name
Varies – includes species like Apteronotus albifrons (Black Ghost Knife Fish), Chitala ornata, etc.
Habitat
Native to South America and Southeast Asia, commonly found in slow-moving rivers, flooded forests, and swamps.
Conservation
Not endangered globally, but habitat loss and over-collection for the aquarium trade pose risks in certain regions.
Lifespan
Typically lives up to 10–15 years with proper care in captivity.
Fun Fact
Some knife fish have weak electric fields used for navigation and communication, especially in dark or murky waters.
Diet
Carnivorous – feeds on insects, smaller fish, crustaceans, and worms.
Average Size
Can grow between 12 inches (30 cm) to over 3 feet (90+ cm), depending on species.
Location / Placement info
Displayed in the Coastal Reef Exhibit, near the Ocean-View Tunnel
FAQ
What is the lifespan of a Knifefish?
Black Ghost Knifefish can live up to 10–15 years in captivity with proper care.
What do they eat?
They are carnivores, feeding on worms, bloodworms, brine shrimp, and small meaty foods.
Are Knifefish aggressive?
They are generally peaceful, but can be territorial with other knifefish or bottom dwellers.
What is the ideal tank size for them?
A minimum of 75 gallons is recommended due to their active swimming and adult size.
Do they need a specific environment?
Yes, they need dim lighting, hiding spots (caves/tubes), and smooth substrate.
How big do Knifefish grow?
Black Ghost Knifefish can grow up to 20 inches (50 cm) in captivity.
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