Pond Boss Forums GENERAL QUESTIONS Help Black patch on CNBG

Pond Owner: "I think it is time to start culling some largemouth bass this year."

Bass in the pond: "No largemouth bass in here. Just us 'ol spotted bass."


In more seriousness, in jpsdad's link it appears to be a genetic condition. If it is only in your CNBG, and they are all related, then perhaps not a problem?

If it starts showing up on your OTHER fish species in the pond, then it likely does have a disease or pathogen vector in your pond.

Have you cleaned any of your CNBG? Does the meat adjacent to the surface patches appear normal?