Ardianingsih, A. IDENTIFICATION OF BIOLOGICAL OXYGEN DEMAND (BOD) LEVELS AS AN INDICATOR OF WATER QUALITY IN THE UPSTREAM AND DOWNSTREAM OF THE BAGONG RIVER, BANYUWANGI: IDENTIFIKASI TINGKAT BIOLOGICAL OXYGEN DEMAND (BOD) SEBAGAI INDIKATOR KUALITAS AIR DI HULU DAN HILIR SUNGAI BAGONG, BANYUWANGI. BIOSENSE 2025, 8, 438-446.