[Carry_Okie]

My gut-level reaction to the data you cite is that it is possibly a sign of fish population exceeding system carrying capacity (now wouldn't that be a shock). The large runs last year might well have left so much animal nutrient in the system that the residual pathogens were in high enough counts to have this effect in late season.

[B4Ranch]

When and why does gill rot occur? Is there any necessary details? ie. warm water, low food quality, etc?