The Threadfin Acara (Acarichthys heckelii), also called Heckel’s thread-finned acara, is a unique cichlid native to the Amazon and Essequibo river basins in South America. With its striking coloration and deep body, this species is known for its elaborate burrow-based breeding behavior and strong parental care. It is the sole member of its genus and has also established itself in parts of Southeast Asia.
Scientific Name
Acarichthys heckelii
Habitat
Tropical freshwater rivers, especially in the Amazon and Essequibo basins
Conservation
Not endangered; rare in the hobby but occasionally available
Lifespan
8–10 years in captivity
Fun Fact
The female digs a complex multi-entrance burrow with a central nuptial chamber for spawning.
Diet
Omnivorous; eats flakes, small pellets, and live/frozen foods like brine shrimp, mosquito larvae, and daphnia
Average Size
Up to 15–20 cm (6–8 inches)
Location / Placement info
Displayed in the Coastal Reef Exhibit, near the Ocean-View Tunnel
FAQ
Is the Threadfin Acara aggressive?
Yes, especially during breeding; aggression between pairs is common.
Can Threadfin Acara be bred in home aquariums?
It's difficult due to complex burrowing behavior and aggression.
What do Threadfin Acara eat?
A mix of carnivorous and herbivorous foods, including flakes, pellets, and frozen worms.
Do Threadfin Acara care for their fry?
Yes, both parents protect the fry until they reach about 12 mm in size.
Where are Threadfin Acara found?
In the wild, they're native to the Amazon and Essequibo river systems.
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