I have been playing quite a bit with fisheries lately. On paper they look meh but on screen it is quite different. +1 food and +1 for an adjacent sea resource however that is incorrect +1 food and +1 for each adjacent resource. Now considering you have a harbour with lighthouse (gives +1 food to tiles) this means a fishery nest to 1 resource is a 4 food 1 gold tile but it does get affected by Auckland. It is fairly easy to get a double sea adjacency somewhere in your coastal water and that means a +5 food tile quite early. The downside to fisheries apart from having to have Liang present is they provide no housing nor are affected by god of the sea or sadly aquariums. The city below is ecstatic, reached its max pop but at 57 production and 25 science per turn without a campus is not bad. Shame about the housing though, stops you getting a real mega city.