More info
Datasheet
| Minimum Tank Size | 2000 litres / 528.34 US gallons |
| Maximum Size | 35.0cm / 13.78inches |
| Temperature | 22°C / 71.60°F - 28°C / 82.40°F |
| Hardness | 1.01dgH / 18ppm - 12.05dgH / 215ppm |
| pH | 6.0-7.5 |
General Description
Acestrorhynchus falcirostris is a member of the putative A. nasutus group, characterized by two dark longitudinal stripes. Juvenile specimens display these stripes, unlike adults, making them distinguishable. The species was diagnosed by Menezes (1969) with specific fin-ray counts, scale rows, and morphological features. The genus includes groups such as A. microlepis and A. nasutus, showing relationships with the Cynodontidae family containing genera like Cynodon and Hydrolycus.
Aquarium Setup
Ideal for larger tanks of at least 2000 liters (see table), A. falcirostris thrives in open water with minimal decor to prevent stress. Sandy substrate, leaf litter, and driftwood can be used for a natural effect. Suitable plants like Microsorum pteropus and Anubias can be added, adjusting lighting accordingly. Adequate filtration with canister filters and weekly water changes of 30-50% are essential due to the species' sensitivity to water quality changes.
Behavior
A generally peaceful species, A. falcirostris can be kept in community tanks with caution when selecting tank mates. They may exhibit territorial behavior towards similar species but are non-aggressive towards conspecifics. Juveniles show schooling behavior, while adults are more solitary and prefer being in groups of four or more. Cannibalism can occur if individuals vary significantly in size, emphasizing the importance of compatibility when adding to a school.
Feeding and Diet
As obligate piscivores, A. falcirostris feeds on larger prey relative to its body size. While they may initially only accept live food, they can be weaned onto dead and dried alternatives. Avoid feeding mammalian or avian meats and 'feeder' fish due to potential health risks. Providing a varied diet ensuring proper nutrition is crucial for their well-being.
Reproduction & Dimorphism
Although courtship and spawning have been observed in aquarium settings, raising fry is challenging. Spawning involves midwater fertilization with minimal parental care. Sexually mature females are slightly larger and deeper-bodied than males, exhibiting subtle sexual dimorphism.
Habitat and Distribution
The species is commonly found in northern Amazon drainages, the Río Orinoco in Venezuela, and various coastal river systems within South America. A. falcirostris inhabits major river channels and tributaries, showing a preference for clear or black waters but can tolerate turbid conditions. They often move into flooded areas during the wet season, adapting to various aquatic environments within their distribution range.