if you look close you can see bite marks, there is no white "rotting" area that i would expect to see in fin-rot.
Again, I'm no expert - but (IMO) these wounds don't look like "turtle-bites" (fin-rays terminate too unevenly). If anything, it looks like a critter "chewed" on the fins. Even so, the circled area just doesn't look right. To me, the skin/scales exhibit advanced stages of "rot".
