Fierce. Because pineapple fish are carnivorous fish, they like to prey on live bait of appropriate size, such as zooplankton, small fish and shrimp. Before sexual maturity, it can live in harmony with other species, but after sexual maturity, it has a strong desire for environmental territory, and even when the bait is insufficient, it will attack small fish for food and other reasons. When breeding, the male fish will become fierce, suddenly attack the female fish he doesn't like, and even chase it to death, so the pineapple fish is fierce.