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Family: Cyprinidae, Subfamily Labeoninae

Common Name: Siamese Algae Eater

Origin and Habitat: SE Asia: Sumatra (Indonesia) and Malaysia, possibly into Borneo, Thailand and Myanmar; the type species was collected near Palembang, Sumatra. Inhabits flowing streams and rivers having a substrate of sand, gravel and boulders.

Compatibility/Temperament: Generally peaceful, suitable for the larger community aquarium with other peaceful fishes such as barbs, danios and most loaches. A shoaling fish by nature, it does best in a group of 6 or more and a distinct hierarchy will be formed within the group.

Siamese Algae Eater Diet

In its native habitat, it grazes on aufwuchs, consuming algae and phytoplankton. A high vegetable diet is necessary to avoid an excess of protein which can cause severe internal issues; blanched spinach, peas, zucchini, chopped fruit in addition to algae. This species is well known as a consumer of beard algae [note comments under Description].


Attains 6 inches (16 cm).

Minimum Tank Suggestion

48 inches in length.

Water parameters for Siamese Algae Eater

Soft to medium hard (5-15 dGH), slightly acidic to slightly basic (pH 6.5 to 7.5), temperature 22-26C/72-78F.


The common name Siamese Algae Eater is regularly applied to several related but distinct species. The subject species is the one most often encountered in the hobby as the Siamese Algae Eater [SAE] and is the best at eating black brush [aka red beard] algae. The "true" SAE is actually Crossocheilus siamensis, a species initially described by H.M. Smith in 1931 as Epalzeorhynchus siamensis and moved by Banarescu into the genus Crossocheilus in 1986, and which has probably never been seen by hobbyists since the holotype [the specimen collected and used for the description] is the only one known. To further confuse, C. siamensis is now considered a synonym for the actual species name, Crossocheilus oblongus.

Confusion abounds with this fish, beyond the above. There are several near-identical species within Crossocheilus, and they are occasionally seen in the hobby. Their usefulness as "algae eaters" is variable, depending upon the species. Then there are two other fish often confused with the SAE, known as the False Siamese Algae Eater, Garra cambodgiensis, and the Flying Fox, Epalzeorhynchos kalopterus. Both of these regularly appear in the hobby, but neither will handle brush/beard algae like the common SAE. The False SAE can be distinguished by the dark lateral band that ends at the caudal peduncle whereas on the subject fish this band continues into the caudal fin. The Flying Fox has white-edged red and black coloured fins, not clear fins as in the subject species.

Then there is the Chinese Algae Eater, a fish that is sometimes offered as a SAE. It is much less desirable for several reasons as outlined in the Profile of that species, Gyrinocheilus aymonieri.

As noted under Origin, this fish occurs in flowing waters and is intolerant of high nitrates and any build-up of organic waste, requiring clean, well-oxygenated water; it is an active swimmer and thus needs space. It will therefore be best in a river or stream aquascape having a reasonable current from the filter along with a substrate of gravel, sand and pebbles, with larger rocks simulating boulders and some bogwood added. As noted under Compatibility/Temperament, it should be kept in a group of 6 or more so that the natural interaction between fish can be enjoyed.

As mentioned under Diet, vegetable foods must form the bulk of its diet; protein foods will lead to health problems. Properly cared for, this species can live 10 years or longer.

The species was first described in 1860 by P. Bleeker, though the genus name was incorrectly given as Crossocheilos (Crossocheilichthys).


Banarescu, P. (1986), "A review of the species of Crossocheilus, Epalzeorhynchos and Paracrossochilus (Pisces, Cyprinidae)," Travaux du Museum d'Histoire Naturelle "Grigore Antipa," v. 28, pp. 141-161.

Rainboth, W.J. (1996, Fishes of the Cambodian Mekong, FAO Species Identification Field Guide for Fishery Purposes.

Tan, H.H. and Maurice Kottelat (2009), "The fishes of the Batang Hari drainage, Sumatra, with description of six new species," Ichthyological Exploration of Freshwaters volume 20 (no. 1), pp. 13-69.

Contributing Members

The following members have contributed to this profile: Byron


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