Utility of Batang Toru River (North Sumatra, Indonesia) for fishery activities of the local communities: a study on fisheries socioeconomic conditionThomas Nugroho, Charles P. H. Simanjuntak, Sulistiono, M. Fadjar Rahardjo, Dadang Shafrudin, Totok Hestiranoto and Agus Joko IsmantoE3S Web Conf., 322 (2021) 05013DOI: https://doi.org/10.1051/e3sconf/202132205013