It sounds as if all piscine life has indeed been exterminated.

As you note, a great loss of old friends.

Not to be annoyingly optimistic, but this does afford you a fairly unique opportunity to start over again. Don't be afraid to draw the pond way down, remove/replace old structure, generally renovate, which you can afford to do since the fish are gone. Then, you can stock a strong forage base, and add predators this fall or in early spring. If the pond isn't quite full for winter, it should be by spring, and you're unlikely to lose anything during the winter even if it's not quite full as far south as we are.