Overview
Pacu are robust, large fish that require a spacious tank with strong filtration. They are generally peaceful but should not be kept with smaller species. With proper care, they can live up to 5 years. Their diet should be varied and include both plant-based and protein-rich foods.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Serrasalmidae |
| Genus | Colossoma |
| Species | Colossoma macropomum |
| Water type | freshwater |
Natural Habitat
Native to the Amazon River in South America, Pacu are commonly found in fast-flowing rivers and streams.
Appearance
Pacu have a large, robust body and are dark gray in color with silver spots.
Behavior
While not a schooling fish, Pacu can be kept in groups. They are curious and active, needing plenty of space to swim. They may become territorial as they grow, so provide ample space and consider adding plants or rocks for territories.
| Trait | Value |
|---|---|
| Temperament | tolerant community fish |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22–28°C (72–82°F) | Use a reliable adjustable heater |
| pH | 6–7 | Avoid sudden swings |
| Hardness (GH) | 3-10 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 1000L (264 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Can grow to be the size of a small child.
- Known to eat nuts and seeds in the wild.
- Are known to be the freshwater equivalent of the piranha.
📋 Full Care Guide
Ready to set up a tank for your Pacu? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Pacu Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.