Knifefish
ExploreFish
Knifefish
Gymnotus carapo
Knifefish are sleek, silver fish with long bodies that look like sharp knives. They glide gracefully through the water, using their electric senses to find food and communicate with each other.
Habitat: Freshwater
Appearance
The Knifefish has a long, flattened, ribbon-like body, often pale or translucent. Its continuous, undulating anal fin runs along most of its underside, giving it a unique rippling movement. It lacks prominent scales and typically has very small eyes.
KingdomAnimaliaPhylumChordataClassActinopterygiiOrderGymnotiformesFamilyGymnotidaeGenusGymnotus
Category
FishRarity
Common
Danger
2/5 · Low
Snaps
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Interesting facts
Knifefish can hover perfectly still in the water, thanks to their specialized fins.
Some knifefish species are completely transparent, almost invisible in the water!
Their eyes are very tiny, as they rely more on electric senses than sight.
These fish have almost no visible tail fin, making them look like a swimming knife!
Special abilities
Ability
Electric Sense
Knifefish can generate weak electric fields that help them 'see' in the dark or murky water, sensing objects and other fish.
Ability
Backward Navigator
Knifefish has a unique undulating fin that allows it to swim both forwards and backwards with incredible precision.
Measurements & details
- Length
- 10-50 cm
- Weight
- 0.01-0.1 kg
- Lifespan
- 3-8 years
- Swim Speed
- 5 km/h
- Maximum Depth
- 5 m
- Water Type
- Freshwater
Diet & Feeding
Knifefish are hunters that eat small insects and tiny aquatic creatures.
Age differences: Younger knifefish primarily eat zooplankton, while adults add larger insects and small fish.
Primary Foods
- Insect larvae
- Small crustaceans
- Worms
- Zooplankton
- Small fish
Foraging Method
- Ambush
Ecological connections
eaten by
Peacock Bass
Cichla ocellaris
A large predatory fish.
eaten by
Wolf Fish
Hoplias malabaricus
Hunts them in the same rivers.
eats
Midge Larvae
Chironomus plumosus
A key food source in riverbeds.
eats
Water Flea
Daphnia pulex
Tiny prey for young knifefish.
Traits
Wildlife
Wildlife encompasses all undomesticated animal and plant life existing in their natural habitats.
Camouflaged
Camouflaged describes organisms that possess coloring or patterns that allow them to blend into their environment.
Piscivorous
Piscivorous organisms are animals that primarily subsist on a diet of fish.
Longevous
This trait characterizes organisms with an exceptionally long lifespan compared to others of their kind.
Electrogenic
This trait describes organisms capable of generating electric fields or electric shocks.
Freshwater
Freshwater habitats include non-saline aquatic environments such as rivers, lakes, ponds, and wetlands, vital for numerous species.
Aquatic
Aquatic habitats encompass environments where organisms live predominantly in water, including oceans, rivers, lakes, and wetlands.
Nocturnal
Nocturnal animals are primarily active during the nighttime hours, typically resting or sleeping during the day.
Also known as
Brown Ghost KnifefishElectric Knifefish
Collections
Safety
Danger
2/5 · Low
Always observe knifefish from a safe distance and never disturb their natural habitat.
Frequently Asked Questions
How long is Knifefish?
10-50 cm
How much does Knifefish weigh?
0.01-0.1 kg
How long does Knifefish live?
3-8 years
What does Knifefish eat?
Knifefish are hunters that eat small insects and tiny aquatic creatures.
How fast can Knifefish swim?
5 km/h
Where is Knifefish usually found?
Freshwater
How does Knifefish hunt?
Ambush
How deep can Knifefish go?
5 m
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