Why do goldfish shed their scales?

Goldfish do not shed their scales under normal circumstances. If a goldfish is seen shedding its scales, it is usually a sign of an underlying health issue. Some possible causes include:

- Skin parasites: Parasites such as ich, flukes, and anchor worms can irritate the fish's skin and cause it to shed scales.

- Bacterial infections: Bacterial infections, such as columnaris and fin rot, can also lead to scale loss.

- Fungal infections: Fungal infections, such as Saprolegnia, can cause the scales to become loose and fall off.

- Nutritional deficiencies: A diet that is deficient in vitamins and minerals can weaken the fish's immune system and make it more susceptible to disease. This can lead to scale loss.

- Stress: Stress from factors such as poor water quality, overcrowding, or shipping can also cause goldfish to shed their scales.

If you notice your goldfish shedding its scales, it is important to take it to a veterinarian for a proper diagnosis and treatment.