High angle aerial over contaminated Lake Batur with Tilapia fish farming, Bali

lake batur tilapia fish farming bali contaminated high angle aerial aquafarm volcanic lake water pollution lake health green polluted aquaculture fish farming edge drone pesticides agricultural runoff bangli cage aquafarming tilapia water contamination chemical fertilizer sulfur fish farm caldera lake green water volcanic net cage oreochromis niloticus farm catchment agriculture environmental impact indonesia aquaculture business aquaculture industry southeast asia farming environment birdseye south east asia subak irrigation channels fish waste algae growth water degradation crisis