Integrated fish farming is a type of polyculture where you could have several sub-systems of agriculture around your fish pond. In case of an indoor pond or aquarium based fish farming, you could have a vertical aquaponic system for growing fish and plants at the same time.
In a properly integrated fish, livestock and crop farming system, the waste, excretion and manure from animals can be used as feed for the plants and the leftover waste from plants can be used to feed animals. Excrement from fish and livestock is high in ammonia and nitrogen, which acts as a high-quality fertilizer for farmlands. Water and the bottom silt of fish ponds are also rich in nutrients and can be good sources of fertilizer for irrigating the crop land.