Rosy Bitterling

The rosy bitterling is a small bitterling that lives in the slow-flowing waters of East Asia. Like its European relative, it deposits its eggs inside living freshwater mussels; the young complete their development inside the mussel. Breeding males stand out with their pink-red, iridescent colors, while females are plain silver.

In some regions where it has been introduced, it has caused problems by hybridizing with native bitterlings; aquarium fish must never be released into the wild.

• At least 60 liters and 60 cm in length for a group of 6–8.
• 15–22°C is ideal; a heater is usually not needed, and it lives comfortably at room temperature.
• Sand substrate, dense planting and well-oxygenated water.
• Breeding requires living freshwater mussels; keeping mussels alive in an aquarium is difficult and requires preparation.

Omnivorous. It feeds on small flakes and granules, spirulina, frozen daphnia, brine shrimp and small bloodworms.

Peaceful and social. During the breeding season, males engage in short chases around the mussels; this is harmless.

Good companions: small, peaceful species that like cool water: white cloud mountain minnows, gold barbs, rosy barbs, dwarf shrimp, snails.

Avoid: large and aggressive fish, tropical species that need high temperatures.