Aquaculture
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Aquaculture is farming on water. Many of the same principles as farming on land apply, and there can also be synergy between land-based and water-based farming - for example, the tadpoles that will occur endemically in ponds in most climates are an excellent food source for chickens.
Because fish are cold-blooded, and because water provides buoyancy so they do not have to expend energy to hold themselves up all the time, they are much more energy-efficient organisms than land based animals.
Large stones placed in a pond will serve as a heat sink, making the water cooler in hot weather and warmer in cool weather.
An open-source design for a small modular fish farm has been made available by the opensorcerors at N55.dk. It can be stocked with fish and left floating in any body of water you have on your land. Fish can easily be harvested from the module. Multiple modules can be linked together, according to how much room you have.
See also aquaponics, a more controlled method of growing fish.