For a history of my Praecox Rainbow's illness, check out my "Why do Rainbows turn white?" Well, my rainbow finally died. It never thrived liked the other purchased at the same time. Then its flesh became more opaque and whitish, and it had a raised sore under its pectoral fin. The flesh returned to its normal color but the sore remained. It was breathing rapidly and stopped eating. It tried to eat but couldn't swallow. After weeks of watching her wasting away, I decided to euthanize her.
I decided to do an autopsy (which I figured that I was qualified to perform since I have watched so much CSI). I started by poking at the pectoral sore with tweezers, and before I could start cutting, a small cyst popped out. It was less than a millimeter in diameter, whitish and irregularly shaped. Is this piscine tuberculosis?