25 is too confident of an answer. I think 19 is best because the extra 6 bass to get to 25 might cause the changes in the extra variables described above (like carrying capacity/metabolic load/pellet protein percentage/waste ammonia levels/transport stress/and early mortality equations) to change again.
But 25 is still a reasonable target, it all depends.
what if you think you have 25 female LMB and one isn't female, will you try to correct the ratio later?
aetain, if you want a number I'd go with one of the numbers here. If you want to rely on the fact that this number is the correct one then you had better not go any further into owning a pond and stocking it, as there is no way to correct or plan for all these variables.
I think you are missing out on the fun that can be had when you don't know how things will turn out, yet you jump in both feet anyway!
Seriously, how do you dare buy green bananas? And how do you know how many to buy?
