Updated On October 9th, 2018
Pet's info: Reptile | Aquatic Turtle | Male | unneutered
Answered By Todd Cecil 239
Veterinarian
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Thanks for including the pictures. I would be concerned that the shell discoloration on the plastron (lower shell) is a clinical sign of an infection or bruising. On one picture, there appears to be several areas where the shell is discolored (grayish).
If it appears green to you, see if you can scratch it free with your fingernail, it could be algae. Algae build up on the shell is often a sign of water quality issues.
If the discoloration seems to be deeper, it might be an infection and painful, and why he tried to bite.
If this is the case, a visit to a reptile veterinarian is recommended.
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