There can be many reasons for a turtle's shell to turn white, here are some common ones:
1. Calcium deficiency: Calcium deficiency is one of the most common causes of whitish turtle shells. If a turtle's diet lacks calcium, its shell will become soft and brittle and may gradually lose its color.
2. Malnutrition: Malnutrition may also cause turtle shells to turn white. Such as lack of vitamin D3 and other nutrients.
3. The turtle shell is too old: If the turtle shell is too old or damaged, the surface may turn white.
4. White spot disease: White spot disease is a fungal infection that causes white spots to appear on the surface of the turtle shell, causing the turtle shell to turn white.
5. Other diseases: Other diseases such as metabolic acidosis, abnormal liver function, etc. may also cause the turtle shell to turn white.
If you notice whitishness on your turtle's shell, consult your veterinarian as soon as possible for diagnosis and treatment. While you wait for the vet, make sure your turtle's diet contains enough calcium and vitamin D3, and check the enclosure to make sure it's clean and comfortable.
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