In this study, a traditional longline set used in the lower Sakarya River was investigated. Technical characteristics and usage of the longline set were determined. Approximately 25-30% of the fishermen in the lower Sakarya River use this method. Fishermen use the longline set with 30-40 baited hooks by positioning them between the two banks of the river (30-60 m). Fishermen target relatively big individuals, especially, Silurus glanis. However, Esox lucius and some Cyprinidae species are also caught. The average daily catch is between 5-10 kg and captured S. glanis individuals are between 1-20 kg. To ensure sustainability, catch per unit efforts of this traditional method, and spawning stock biomass should be monitored.