Paretroplus tsimoly is a species of cichlid fish from the Betsiboka River basin in northwestern Madagascar.[1] Like other members of the lamena group, it is a rheophile (although less so than Oxylapia polli). This relatively elongate Paretroplus reaches about 16cm (06inches) in length, and is closely related to P. lamenabe and P. nourissati.[1]