Hello and welcome. My name is ***** ***** I'm a biologist with a special interest in reptiles. Thank you for including a photo. I'll give you something to try. Take a clean toothbrush, and with the turtle in shallow water, brush the white spots. Let me know if they stay the same or if some of it comes off. Thank you.
The white stuff is most likely hard water deposits. It's possible the water in the tank was contaminated from the smoke, and the deposits formed as a result of the particles. As for the peeling, that may be normal. It's the turtle's way of shedding. However, if it becomes excessive, it can be the result of a fungal infection. In the photo you sent, it didn't look like that was the case.
Just saw your newest post and pictures. If the white were fungus, it would have come off with the toothbrush. Something did come off on the toothbrush, most likely as a result of the smoke, as you suspect. Since your turtle is active and happy again, I would just keep an eye on the shell. The deposits may eventually come off on their own, or you can continue to brush them. If the shedding gets worse, there could be fungus. At this point, though, he looks healthy.
You're welcome. I had gone offline for the night when you posted this. The most important way to prevent fungus is to provide proper conditions. Mud turtles are very sensitive to water quality, so good filtration is important. Correct lighting and temperatures are equally important.
Mud turtles are known for not basking very much, but it's still important to have a basking area at about 85*F. If teh basking platform is just a little bit below the water surface, he may be more likely to use it. UVB light is very important. I recommend the Reptisun 10.0 in the straight tube style. Also, provide a cuttlebone as a calcium source. Cuttlebones are sold in the bird department of pet stores. Just put one in the tank without the accompanying holder - your turtle will eat what he needs.
If you need anything else, don't hesitate to ask.
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