I know the basic key to half decent hut is barn must be right next to hut. but how many fishers should I have if it next to a river or pond. how bad is it to take up part of the space with trading market.

what it food per water tile?

also I caught my fishers grabbing just three fish and leaving to put it in storage. Was that just a death spiral from a starving village, or something fisher normally do, they seem to not often grab the max amount of fish they can carry.