There were definitely fish ponds dating back before the Renaissance. (If I recall, they're downright ancient in Japan.) These were used to raise fish for food for the lord of the land when normal access to fish wasn't as ready at hand.
To note, there's no reason there couldn't be some sort of "fish pond" in the game without developing some sort of fluid dynamics. Just simply make it like a smelter, oven, or other functional object*. The idea is that if it's not properly "maintained" it would decay because it filled with mud and silt. One could "destroy" it by backfilling it with dirt (normal destroy action, this is just the concept of what the character is doing to get rid of it).
*guess turkey coop would be more accurate here. Fish types might be limited based on size of pond and type.