Chao Phraya giant catfish swarming around a Thai Ferry Boat in murky brown brackish water

pangasius sanitwongsei chao phraya bangkok thailand murky brown storm water fins underwater swarming fish frenzy canal dock boat anchored tied carnivores feeding shore shallow river waterway sewage pollution environment native endangered shark catfish catfish critcally endangered overfishing brakish polluted drainage canals waterways freshwater animals wildlife mysterious creatures lurking migratory species diet ecosystem