Green polluted water of Lake Batur and aquaculture fish farming near edge, drone

green polluted lake batur aquaculture fish farming edge drone pesticides agricultural runoff bali bangli cage aquafarming contaminated volcanic lake tilapia water pollution water contamination chemical fertilizer sulfur fish farm lake health caldera lake aerial aquafarm green water volcanic sediment 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