Andy; a quick Google Search will give you a host of recipes for "Fish in Crazy Water. And they llok good too.
And I believe any firm whit-fleshed fish, such as cod, seabass, bluefish, halibut, orange roughy, tillapia, or pollock could be succesfully used in this dish. It would also work with some freshwater varieties such as small mouth bass, yellow perch, walleye (pikeral for our Canadian buddies), whitefish, etc.
Seeeeeya; Goodweed of the North