This is from the game and fish website.
So possession limit comes into play for ND residents if they are not at their HOME. So like if they were camping for 3 days. They can only have the "possession" limit for the species. So if it is walleyes that is 10 total per licensed fisherman. Now if they fished 3 days and went back to their home each day... They could have as many as they want "storage limit" just as long as one of the days they didn't go over the daily limit.