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The main objective of the present study was to assess the status of the small-scale commercial gillnet fisheries for the two introduced fish taxa: Oreochromis niloticus (Nile tilapia) and Cyprinus carpio (Common carp) in a small crater lake, Hardibo (Ethiopia). The daily recorded commercial catch data (from 2012 to 1015) were used for analyses. To recalculate mean length and weight from the catch in number, length and weight were measured every week from February to April 2016 by taking samples from the commercial fish landing. The two introduced taxa successfully established in the lake and contributed all the commercial fisheries of the lake. The mean total annual production of the commercial gillnet fishery for both species was found to be 71 ± 2.9 tons. This created a livelihood for more than 80 fishermen. Although this small-scale fishery is regulated, recently illegal, unregulated and unreported (IUU) fishing practice has become more common in Lake Hardibo and thus, monitoring the fishery in this lake is crucial before it collapses.