Oxygaster anomalura
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| Oxygaster anomalura | |
|---|---|
 | |
| Oxygaster anomalura from West Kutai Regency, East Kalimantan, Indonesia | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Cypriniformes |
| Suborder: | Cyprinoidei |
| Family: | Xenocyprididae |
| Genus: | Oxygaster |
| Species: | O. anomalura |
| Binomial name | |
| Oxygaster anomalura van Hasselt, 1823 | |
| Synonyms | |
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Oxygaster anomalura are medium-sized freshwater fishes in the family Xenocyprididae, that can reach up to 200 mm SL(standard length), and are found near the surface in small- to medium-sized rivers in Southeast Asia, where they live off a diet of invertebrates.[2]
There are many rivers that run throughout Southeast Asia. In Malaysia, there is the Batang Kerang floodplain, which is located in Balai Ringin, Sarawak and is home to many species of fish including Oxygaster anomalura. In Batang Kerang, there are streams that are shaded by canopy vegetation. They have developed steep, muddy banks that have been affected by the frequent rise and fall of water levels. Areas where swamps or peaty soils develop, the waters can be seen as heavily colored. These dark, colored streams are commonly known as black water streams or rivers. Black water rivers are typically highly acidic, with pH ranging from 3.6 - 5.9, with low dissolved organic and suspended solids. When observed with transmitted light, the river gives off a tea color. It gives off a black color when seen with reflected light.[3]
Besides black water rivers, there are also brown rivers in Batang Kerang. These rivers are often brown and muddy due to its high sediment contents. Some areas of the brown water are marked by extensive floating vegetation.
