True Siamese Algae Eater (Crossocheilus oblongus)

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Crossocheilus siamensis2.jpg
True Siamese Algae Eater

Crossocheilus oblongus

150 Litres (39.6)

30.5-38.1cm (12-15 ")




6.0 - 7.5

22 -28 °C (71.6-82.4°F)

8-20 °d

1:2 M:F

Flake Foods
Other (See article)

10-12 years



Additional names

True Siamese Algae Eater

Additional scientific names

Epalzeorhynchos siamensis, Crossocheilus siamensis


Females are slightly broader in the mid-section when compared to slimmer males.


During mating, males will burrow a trough into substrate, then try to entice the female to follow them into the trough. Observed male behaviour during attempted mating includes 'tailstanding' and 'shimmying'.

Tank compatibility[edit]

Peaceful fish and good in community tanks. Don't put this fish in with other similar shaped fish, like the Ruby Shark or the Flying Fox as these other fish are territorial and will chase them away.


Likes algae and catfish pellets and flakes, will also eat blanched vegetables. One of only a few fish that actually eats hair and beard/brush algae.

Feeding regime[edit]

Feed sparingly depending on the algae content of it's environment. If it's algae-infested this fish will only need supplemented food once or twice a week, however, if it's environment is entirely algae-free this fish will need supplemented feeding every day. The fish tends to be seen eating constantly if kept with other tank mates, on fish food for other fishes, as well as constantly nibbling at algae throughout the day.

Environment specifics[edit]

Likes plants and well oxygenated water. Keep in a hooded tank if water oxygen levels are prone to falling, to avoid the mishap of this fish's jumping out of the tank.


A generally peaceful fish. It likes to rest on top of leaves which can support it's weight, such as the Amazon Sword, and on driftwood/rocks if present in the aquarium. This fish can be shy. It is territorial towards its own kind and should either be kept singly or in groups of 5 or more. It is a graceful swimmer, and likes to swim in the current.


Long slender brown/gold fish. Has a bold, black strip running the full length of its body to the very edge of its caudal fin (other similar species stop short of the caudal fin). Has Rostral‎ barbels ('moustache').
Easy to confuse it with the Flying Fox (Epalzeorhynchos kalopterus) which has a extra thin gold/bronze strip on top of the black strip.
Very similar to the False Flying Fox when young, except that fish has a light strip running above the black band.
Very similar indeed with the Siamese Flying Fox except with that fish the black band doesn't go into the caudal fin.


External links[edit]