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channa kellartii
Channa kellarti,

the Dwarf snakehead, is a species of fish in the family Channidae. The name "Dwarf snakehead" is also used for several other species of small snakeheads. C. kellarti is native to freshwater habitats in Sri Lank an, This fish species is identified as a subspecies of C. gachua and the isolated Sri Lankan population is identified as C. kelaartii.Locally called පඬරැල් කනයා It is one of the smaller species of snakehead and has a standard length of up to 14.4 cm (5.6 in).

This was for a long time considered to be a junior synonym of Channa gachua. In fact, both species closely resemble each other. Occurs mostly in lotic waters such as streams and rivers, also in lentic habitats such as pools and ditches in the lowlands. This species is usually associated with submerged roots, leaf debris and marginal vegetation during day�time, with adults solitary or occurring as pairs. At night, individuals can be more easily observed in open waters. It occurs even in highly modified habitats such as concretized drains and canals in urban areas. Highest elevation recorded for this species was ca. 700 m asl at Lunugala, but it has also been reported it from Diyatalawa, ca 1200 m asl. Reported from southern peninsular India from east-fowing drainages