Fig 1
Fig 2
Fig 3
Fig 4
Fig 5
Fig 6
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Order : Cypriniformes
Family : DANIONIDAE
Species : Rasbora einthovenii
Standard Length (excludes tail) : 10.6 cm
(Fishbase 2026)
Rasbora einthovenii (Einthoven's Rasbora, Brilliant Rasbora) occurs in Peninsular Malaysia, Singapore, parts
of Sumatra, the Riau Archipelago (including Pulau Sugi - see Figures 5 and
6), Bangka Island and parts of Borneo (Lumbantobing,
2020, Syarif et al, 2023).
This species inhabits slightly acidic, slow-flowing forest streams (with a
pH of 6.0 to 6.5), typically in the upper and middle levels of the water
column; its diet comprises worms, crustaceans and insects (Fishbase, 2026,
Ho et al, 2026).
In the field it can be identified by the presence of a black stripe with a
ragged edge along each flank, from the snout to the start of the tail fin.
Its scales are silvery and reflective, typically appearing as golden from
above. In larger examples the posterior part of the dorsum may have a
pinkish/purplish hue. Juveniles may have a pale marking above the lateral
line on their flanks (see Figure 3).
This small rasbora was named in 1851, after a Dutch surgeon and
public health official in Java during the colonial era.
Fig 1 : Part of a large
shoal of Einthoven's Rasbora in a shallow stream feeding into freshwater
swamp forest in Singapore,
including an example with a pinkish/purplish hue in the posterior part of the body.
Fig 2 : Sun-dappled stream draining into freshwater swamp forest in
Singapore.
Fig 3 : Two adult examples with a group of juveniles bearing white
markings.
Fig 4 : Possible gravid female in a shallow forest stream in the west of Singapore.
Figs 5 and 6 : Adults with pinkish/purplish hue in a shallow forest stream
at Pulau Sugi, Riau Archipelago, Indonesia.
References and links :
Ho Jonathan K. I., Sorain J. Ramchunder, Andrew Memory, Meryl Theng, Li
Tianjiao, Esther Clews, Cai Yixiong, Tan Heok Hui & Darren C. J. Yeo. (2016). A
Guide to the Freshwater Fauna of Nee Soon Swamp
Forest. Singapore: Lee Kong Chian Natural History Museum & Tropical Marine
Science Institute, National University of Singapore. 139 pp.
Lumbantobing, D. 2020. Rasbora einthovenii. The IUCN Red List of
Threatened Species 2020: e.T89806694A89806700.
Syarif, A. F., Kurniawan, A., Kurniawan, A., Robin, R., & Valen, F. S.
(2023, November). First genetic record and phylogenetic relationship of
Rasbora einthovenii (Bleeker, 1851)(Cyprinidae: Danioninae) from Bangka
Island, Indonesia. In IOP Conference Series: Earth and Environmental Science
(Vol. 1260, No. 1, p. 012002). IOP Publishing.
Fishbase - Rasbora einthovenii
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