The size selectivity of the main body of a sampling pelagic pair trawl in freshwater reservoirs during the night

► We tested the selectivity of a trawl main body during night sampling. ► Trawl selectivity was determined by comparing the catch using this gear with that from a purse seine net. ► Both gears are size selective - small fish escaped through meshes of the trawl whereas larger fish from the purse seine.