You really need to determine what type and class sizes of fish you have (forage and gamefish). There's not much that can be done until that is estimated. An electroshock survey seems to be the best way to make that kind of estimate, but most choose not to spend that kind of money for get that level of accuracy. Fishing, trapping, netting, and relative weight studies will be give you the next best guess.

Once you have an idea of what's in the pond, you can then determine what needs to be adjusted (if anything). This type of planning gets well beyond my experience level, but there are very helpful folks here that can assist with that.

Stocking fingerlings, of any kind, as well as minnows would likely just be feeding the existing fish an expensive meal that would have very little return on investment.

Two rules of thumb regarding trying to manage LMB populations for larger LMB...

1.) Take out all the ones smaller than 12-14 inches depending. This is based on the tendency for LMB to overpopulate and stunt, AND that most pond owners cannot fish/catch enough of the LMB to control this. Taking out all the smaller ones gives you a chance at leaving more food in the pond for the ones that escape your hook.

2.) Take out the skinny ones for sure. If a LMB is skinny, it probably means that the food size that it prefers is lacking and/or there are a lot of LMB its size in the pond that is competing for that forage size.

It kinda goes the other direction if you want larger bluegill...you want an overpopulated stand of stunted LMB. The numerous LMB can really keep the BG from overpopulating, but those that escape the LMB have a good chance of getting really big since the LMB have stunted.

The above two scenarios (larger LMB or larger BG) are why it's important to estimate what you already have so that you can decide what to do next.

Another option is to drain the pond, remove the fish, and start over. There are many ways to go from there and can often lead to a more trophy-prone pond in the same or less amount of time.

I'd definitely be fishing for the cats...if there in there, they're could be some big ones! And, if they are, they have likely been reproducing which throws a twist into the possible directions. Now, you can manage for larger CC instead.

Fish on!,
Noel