How has the fog affected the small spreads? Seem like they would be harder for the birds to see.
This is a very interesting question...my first thought would be 'probably not' as it would be the profile and basic shape of the decoy that would matter (since they are not illuminated) therefore it would not seem to make a difference if you had 6 decoys or 36 - if they see one then you are okay (so to speak). However, on second thought it could make a difference; if you have 36 decoys strung out in a rough line then a duck passing perpendicular (or close to perpendicular) over the decoys it will have a greater chance of seeing at least a couple of decoys within a 20-30 yard linear area; with only 6 decoys then the duck has to be right over those 6 to see them so if it flies a few yards on either side of them then they may be missed. This brings up the importance of calling especially if you have a small spread, perhaps if the duck does not see any decoys on first glance any calls made should catch its attention for a few seconds and maybe have it give you a second or third look increasing the chances of it seeing your decoys.
Maybe we should invent illuminated decoys for foggy days...hmmm...
Do you know why Cajuns don't hunt elephants? Because the decoys won't fit in their pirogues!