The Red Tail Barracuda (Acestrorhynchus falcatus), also called the Freshwater Barracuda, is a sleek, predatory characin native to the rivers of South America. Despite its name, it is not a true marine barracuda but a powerful freshwater species that grows up to 12–15 inches in aquariums. It requires a very spacious tank with open swimming space, strong filtration, and a tightly fitting lid, as it is an agile jumper. Best suited to experienced aquarists, the Red Tail Barracuda is a fast predator that should not be kept with small fish, which will be eaten, but can coexist with similarly sized, robust species. They are carnivorous, preferring live prey such as feeder fish, shrimp, and insects, though some individuals can be weaned onto frozen or prepared meaty foods. With stable, clean water and plenty of swimming room, they make an impressive display fish, but their aggressive feeding behavior requires care and planning.
| Parameter | Requirement |
|---|---|
| Scientific Name | Acestrorhynchus falcatus (Red Tail Barracuda) |
| Tank Size | Minimum 125 gallons |
| Temperature | 24–28°C (75–82°F) |
| pH Range | 6.0–7.5 |
| Water Hardness | Soft to moderate (5–15 dGH) |
| Substrate | Sand or fine gravel with open swimming space |
| Diet | Carnivorous – live fish, shrimp, insects; may adapt to frozen meaty foods |
| Temperament | Predatory; unsuitable with small or slow-moving tankmates |
| Social Behavior | Can be kept singly or in small groups if space allows |
| Breeding | Rare in captivity; egg scatterer |
| Lifespan | 8–10 years with proper care |
