Rosy Bitterling (Rhodeus ocellatus)
The Rosy Bitterling, Rhodeus ocellatus, is a peaceful, cool-water cyprinid with a silvery body, delicate pink to rosy breeding colour and attractive natural shoaling behaviour. This unusual species is best suited to unheated or cooler aquariums, temperate planted setups or carefully managed outdoor tubs rather than warm tropical community tanks. It is especially interesting because bitterlings have a remarkable breeding relationship with freshwater mussels, although this should only be attempted responsibly and never with protected native UK mussels.
Common Name:
Rosy Bitterling, Chinese Bitterling, Rose Bitterling, Bitterling.
Scientific Name (Latin):
Rhodeus ocellatus
| Species | Rhodeus ocellatus |
|---|---|
| Water Temperature | 10–18°C |
| Hardness | 3–10 dGH |
| PH | 6.0–7.5 |
| Compatibility | Peaceful; avoids aggressive or fast-swimming fish |
| Feeding | Small live or frozen foods, algae, and plant matter |
FAQ
What kind of water conditions does the Rosy Bitterling prefer?
The Rosy Bitterling prefers cool water temperatures between 10–18°C and a pH range of 6.0–7.5. It thrives in soft to moderately hard water with a stable, temperate environment.
Can Rosy Bitterlings be kept with other fish?
Yes, they are peaceful and best kept with similarly calm species. Avoid aggressive or fast-swimming fish to prevent stress or injury.
Is there a special breeding requirement for Rosy Bitterlings?
Yes, Rosy Bitterlings have a natural breeding relationship with freshwater mussels. This should only be attempted responsibly and never with protected native UK mussels.
Jake Pullman –
I kept a small group of Rosy Bitterlings in a cool, planted tank with moderate flow. They are very active and show beautiful pink hues during breeding season. The shoaling behavior is fascinating to watch. Perfect for a temperate aquarium setup.
Piers Jones –
These fish are delicate and need stable, cool water. I’ve maintained a consistent temperature and added some Java moss for cover. They seem happy and stay active throughout the day.
Nathan Sutherland –
The rosy coloration during breeding is stunning. I’ve observed them gathering in small groups and swimming together in a natural way. They don’t compete with other fish and are easy to care for in a cool setup.