Description
Four-Eyed Fish – Anableps anableps
Introduction
The Four-Eyed Fish (Anableps anableps) is a fascinating brackish-water species known for its unique split-eye adaptation, allowing it to see both above and below the water surface simultaneously. Reaching up to 12 inches (30 cm) in length, this fish is best suited for large aquariums with a mix of land and water areas. Popular among experienced aquarists, its intriguing behavior and social nature make it a rewarding species to keep.
1. Natural Habitat and Behavior
Native to Central and South America, the Four-Eyed Fish thrives in brackish estuaries, tidal flats, and mangrove swamps. It is an active surface-dweller, often seen skimming the water’s edge in search of food. These fish are social and do best in small groups, exhibiting schooling behavior in the wild.
2. Aquarium Setup
- Tank Size: Requires a minimum of 75 gallons for a small group.
- Water Conditions: Prefers brackish water with a salinity between 1.005-1.015 SG, temperatures of 75-82°F (24-28°C), and a pH of 7.5-8.5.
- Substrate and Decor: A sandy substrate with driftwood, mangrove roots, and floating plants helps replicate its natural environment.
- Lighting: Moderate lighting mimics its natural coastal habitat.
- Filtration: Strong filtration and regular water changes are essential to maintain water quality.
3. Diet and Feeding
- Carnivorous by nature, Anableps anableps feeds on insects, small crustaceans, and plant matter.
- In captivity, they accept high-quality pellets, frozen shrimp, bloodworms, and live insects.
- Feeding should occur at the water surface to match their natural hunting behavior.
4. Compatibility with Other Fish
- Best kept in groups of 3 or more to reduce stress.
- Compatible with other brackish water species like archerfish, mollies, and scats.
- Avoid aggressive or fin-nipping fish, as Four-Eyed Fish can be easily stressed.
5. Common Challenges and Tips
- Brackish Water Requirements: Many aquarists mistakenly keep them in freshwater, which can lead to poor health. Maintaining proper salinity is crucial.
- Large Tank Needs: Due to their active swimming and schooling behavior, a spacious tank with surface area is essential.
- Jumping Behavior: These fish are excellent jumpers, so a secure lid is necessary.
Conclusion
The Four-Eyed Fish is a truly unique addition to brackish aquariums, offering fascinating behaviors and an engaging presence. With the right care, tank setup, and water conditions, Anableps anableps can thrive and provide years of enjoyment for dedicated aquarists.
