The signs before the death of parrot fish mainly include symptoms such as decreased appetite, reduced activity level, scale loss, color fading, and rapid breathing. These signs indicate that the physical health of the parrot fish has deteriorated and it may be on the verge of death.

Specific Manifestations
Decreased Appetite: Parrot fish usually lose their appetite before dying. They show no interest in food and may even refuse to eat. This is because their body organs are on the verge of failure and they are unable to obtain more food and energy.
Reduced Activity Level: The activity level of parrot fish will gradually decrease. Their bodies become weak and they are unable to support swimming.
Scale Loss: Some parrot fish may experience scale loss before death, but this is not a symptom that all parrot fish will have.
Color Fading: The body color of parrot fish will become dim, and the color of their scales will fade.
Rapid Breathing: Parrot fish often exhibit rapid breathing before death and may surface with their heads out of the water, indicating a lack of oxygen or problems with their kidneys.
Prevention and Care Suggestions
Environmental Stability: Keep the water temperature and water quality stable, and avoid drastic changes to protect the health of the parrot fish.
Adequate Nutrition: Provide highly nutritious food to enhance the physical condition and resistance of the parrot fish.
Disease Prevention: Pay attention to the physical condition of the parrot fish, prevent the occurrence of diseases, and deal with abnormal situations in a timely manner.