So far, no apparent problems, but my beloved noticed last week that the frozen peas we use as treats have added salt. (Yikes! ) Anyone know the amount of sodium ducks can tolerate, per pound of duck? Indeed, the ducks love frozen peas for treats. And to thaw them, I rinse them with several changes of warm water. We found one very pricey brand without salt. I give them peas about five times a week - ten runners get ten to fifteen ounces of peas (that's one to one and a half ounces per duck). They also eat Blue Seal pellets, a little cat kibble, and some rolled oats. They browse the garden for greens and creepy-crawlies.