There should be a tier two fishing building that is a little pier, so then the villagers head out in little boats to fish. Make the water side of the mpa look more alive and used. Could have willow or some other resource used to make nets to improve productivity.
Some form of other byproduct of fishing would be nice also, seeing as hunters provide hides and tallow but fish just provides fish. Perhaps fish oil could be a byproduct used for health or as a food type.