Jason most of the RES here have yellowish bellies and mouth is larger than BG plus the red on ear flap
How clear is your pond? Murky ponds the fish color washes out
Here are photos of other BG I have caught in the last 10 days. Mind you this pond was first stocked 9/15/23
The water clarity has been as low as 22” , 2 weeks ago to 28” today.
We fish every day and have never caught a fish that looked like this. They are all round and have color.
Never anything close to this long and lean.