About duck eggs, Love them
They are higher in vitamins and half again as big. The breeds I have, White Layer and Khaki Campbells out produce chickens also. World record is held by the Campbell, over 300 a year.
I live on a Island. San Juan Island, in the San Juan Islands WA. It's a rain shadow of the Olympic Mnts. Less rain than Seattle. about 25" https://www.komonews.com/weather/faq/4306627.html
We have sea weed on the beaches, bull kelp. Not sure what the laws are. Do I need a license to harvest. Seems like you need a license for everything these days.