I've seen trout like that. Not swimming weird but having white spots and looking unhealthy. I read somewheres that its a parasite but if you cook it good it wont hurt to eat it.. Ive ate some and never got sick. The water is probably not healthy. I think its most common in ponds that dont have flowing water. Heres a link with some pics if you do a google search u can come up with more info.
Inshore Fishing report from Capt. Thunderbotlt (aka ) Capt. Rick Georgia saltwater fishing guide