Every pure strain Florida bass I have ever gotten from Florida has those gill plate stripes.
Just by looking at those flawless fish makes me think there's something special about that water. If memory serves, your municipal water originates from the Rocky Mountains of Colorado, via the Colorado River? If so, that explains a lot. Your water must be hard or your fish wouldn't have that shimmer and the tight-looking slime coat. Plus, their fins are flawless, not normal in most pond environments.
Your water is definitely wet...plus some.
