Indostomus is a genus of small ray-finned fish native to slow-moving or stagnant freshwater habitats in Indochina. It is the sole genus of the monogeneric family Indostomidae, Long considered to be sticklebacks, within the order Gasterosteiformes, modern analyses place the indostomids within the order Synbranchiformes, which implies that they are related with the spiny eels and swamp eels.

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