Can anyone tell me what I have going on with my CNBG? I have some that have a black patch extending from the back of the head and along both sides of the dorsal fin. They seem healthy and are eating good. I had a few this summer but now it looks like it maybe about a 3rd are showing this. The one I described has about the largest area I have seen. Most have patches about 1/2 that size. I have seen similar patches on bass in the area lakes but its rare.
Thanks for any help you can provide.