Despite it being a long-established aquarium fish, there is still debate regarding the correct scientific name of this species, with the weight of opinion tending toward R. sericeus. Males look particularly attractive during the breeding season (April to August) and when they are subjected to side lighting.
- Rhodeus amarus, R. amarus sericeus, R. sericeus amarus
- Acheilognathinae (sometimes Rhodeinae)
- Most of Europe north of the Alps, excluding Scandinavia and most of the British Isles (although there are introduced populations).
- 4in (10cm).
- An active fish; may be kept in pairs or small groups.
- All foods, particularly livefoods; vegetable component recommended.
- Roomy and well planted. At least part of the substratum should be fine- grained to accommodate freshwater mussels if breeding is required. Water chemistry not critical but quality must be good. Temperature range: 64-70°F ( 1 8-2 1 : C); cold spell at around 50°F (10°C) during winter improves chances of breeding success.
- Eggs are laid and fertilized inside breathing tube (inhalant siphon) of mussel. Hatching can take up to 3 weeks.