Structure and Distribution of Fish Community in Middle of Hamrin Dam Lake

The nature of structure and distribution of the fish community in the middle of Hamrin Dam lake was studied for the period from July 2020 to April 2021. The lowest temperature was 12.6 m in February and the highest temperature was 34.3°C in August 2020. Furthermore, the lake water was characterized as freshwater, and the lowest salinity was 0.16 g/l during February and the highest 0.38 g/l in September. The levels of dissolved oxygen were high, with highest concentration of 12.5 mg/L in December 2020, while the lowest was 7.4 mg/L in July 2020. A total of 5762 with a total weight of 979.4 kg were collected, where these fishes were represented by 23 species of fish belong to six families. The dominant commercial fishes 13 species were recorded with a total weight of 703.0 kg formed 71.8% of the total fish catches. However, the rest was non-commercial species (10 species) with total weights of 276.4 kg, which represented 28.2% of total fish catches. The fish Planiliza abu ranked the first in terms of numbers with 11.7%, followed by the common carp Cyprinus carpio by 10.8%, then Mesopotamichthys sharpeyi by 8.4%, and the Luciobarbus xanthopterus by 8.3%. In terms of weights, the Silurus triostegus was ranked the first with 23.7%, followed by Luciobarbus xanthopterus by 18.6%, and Cyprinus carpio fish by 10.9% ranked third. The Cyprinion macrostomus recorded and the lowest numbers by 0.1% and the lowest weights 0.01% of total fish catches. The study indicate that the waters of the Hamrin Dam lake are freshwater, good airing, and there are abundant numbers and weights of commercial fish.