underwater
actinopterygii
amazon
amazon river
animal
aquarium
brazil
characiformes
couple
fauna
fish
fishes
freshwater
freshwater fish
freshwater fishes
natural
nature
paraguay
parana
piranha
piranhas
pygocentrus
pygocentrus nattereri
red bellied
red piranha
redbellied piranha
rio de la plata
serrasalmidae
south america
south american
swim
swimming
two
two fishes
water
wild
wild animal
wild life
wildlife