It depends on the type of city you are in. Persia and ancient greece doesn’t have the same ground, so things will grow fast and other will produce less.

You need a Palace! :)

You have to delete the fisheries in order to place them.

It means that you cannot give to the citizens what they asked for, therefore, they refuse to pay you taxes. You need to have enough produces (food, fishes, potteries, etc) AND commerces that delivers theses produces to your houses for them to pay their taxes.