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Abstract
The field survey conducted two time per year with wet season from 28–31 May 2023 and dry season from 6–14 December 2023, in the Ma river basin, Et district, Houaphanh Province northern of Laos PDR. There were six sampling sites for the fishing gear surveys including market surveys. The sampling method used mainly experimental gillnet surveys (GNS) as well as biological parameters associated with participation from local fishermen. The results of fish species based on 1,359 specimens collected in total revealed eight orders 17 families and 46 species. We found that Cyprinidae was the most dominant family with 24 species in total (52.17%), 38 species shared with the northern Vietnam fish fauna included the southern China, while five species shared with the Mekong fish fauna and three species are exotic species. There are 483 specimens with 34 species and 876 specimens with 37 species in the wet and dry seasons, respectively. The water temperature in the wet season was high ranging 30.83–35.4 0C the dry season was low ranging 22.76–24.98 0C.
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