No Salt Salmon Brine?

Any suggestions for a brine without salt. I'd like to smoke some fish for a friend but he can't have salt.

My wife doesn't like salty smoked fish. I've used a bunch of different brines and have good luck just skipping the salt.

Most recently I tried Sky-Guys recipe and like normal I just skipped the salt. A bit sweeter than I like without the salt,but my wife loved it.

cant have any as in zero? or would 1/4 cup to 1 cup White Sugar, 1 Cup Brown and 4 quarts water for say 8 hours be too much?

the problems i find without using salt, is it doesnt "cure" the fish like with a salt brine, so you have to "cook" the fish per say more than actually smoke/dry it...

then again, im betting the Indians (some not all, ones without salt obviously) hundreds of years ago smoked their fish without salt, and just hung them by a smoky fire to dry...

if i were to try on a small amount of fish to figure it out, id try 1 cup Brown Sugar, 1 cup Maple Syrup, 3 quarts water, see what it turns out like ....

Can you use Soy? Or is he allergic to salt in any form?

No salt. I'll use one of the recipes and exclude salt. I'll just suggest eating it within a couple days of smoking.