Fish farming cages on edge of polluted Lake Batur in Bangli district, aerial

lake batur bali bangli cage aquafarming contaminated aquaculture volcanic lake tilapia fish farming water pollution pesticides water contamination chemical fertilizer sulfur green fish farm agricultural runoff lake health caldera lake aerial aquafarm green water volcanic sediment floating net cage oreochromis niloticus farm volcano catchment agriculture polluted fish drone 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