16 pounds and 31.5 inches of pellet slurpin', rod breakin' fury! She started out as a state fair fish of nine-pounds and grew two pounds a year for almost four years between my grow out pond and my big pond. Caught her twice with a fly rod and got some great pictures, too.
The catfish won't prevent your HSB from feeding effectively but they will count against your total pond biomass. Fewer channel cats equals more HSB. I personally don't have any CC in my pond but I understand why people like them.
