O. dovii has no gonopodium like the other members of its family. The dorsal and anal fins are posteriorly placed just before the caudal peduncle and well behind the midbody. The reach a maximum length of about 15 centimetres (6 in) TL.
Many of these fish inhabit brackish waters. They are found in rivers of low elevation, up to 15 metres (50 ft) above sea level. These fish feed on detritus, algae, and sometimes on terrestrial insects.
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