I just looked up the definition of euryhaline - got it.
I included a partial list from the site and wonder if you have considered any of these:
Atlantic Stingray Bull Shark Green chromide Herring Lamprey Mummichog Molly Puffer fish Barramundi Madagascar meagre Mangrove Jack
The mummichog seems an interesting minnow - Travis any experience with them in the coastal areas around you? Wonder if they'd do well in pond environment? Reportedly tolerant of low DO and pollution.
Stingrays could be cool, and young bull sharks, too. Now that would make for an interesting management plan...feeding your fish rats! That video I would need to see!
Many men go fishing all of their lives without knowing that it is not fish they are after. ~ Henry David Thoreau