Because you caught this fish close to the same place it could be the same fish as predators will tend to establish a small area where the food buffet is good for them. One easy way to mark a fish is to cut as in shortening by cutting or clipping the end of a certain one of the dorsal spines. Nail clippers work for this ask.

So far you RW and fish growth is on a good track. One note for your fish growth knowledge. When a fish stops getting enough food it will lose weight but not body length. Once body length is achieved the fish's length does not decrease however body weight can be lost.

One suggestion for continuing on your path to grow bigger bass with high RW. A pond can easily have too many bass but it can never have too many forage fish if growing real high quality sport fish is a main goal. Growing the biggest bass is keeping their numbers selectively low and work very hard and be diligent to keep lots of the proper sized forage fish abundant. Emphasis on Abundant. When fish are losing weight there are not enough of the proper size forage fish and too many things eating the forage fish. Selective harvest is very important for producing a high quality fishery. When your bass are loosing weight you have too many bass.