Step 1: Understanding the Concept:
Integrated Fish Farming Systems (IFFS) integrate aquaculture with other farm enterprises to recycle nutrients and maximize economic returns.
Step 2: Detailed Explanation:
1. Agri-aquaculture (Statement A): Integration of fish with crops like paddy-cum-fish culture and horticulture on pond dykes.
2. Livestock-fish (Statement B): Integration of poultry, piggery, or dairy with fish ponds where manure fertilizes phytoplankton production.
3. Multi-utilization (Statement C): Multi-purpose water use systems for irrigation, livestock watering, and fish culture.
Polyculture is a fish stocking strategy rather than an integrated farming system framework.
Step 3: Final Answer:
Hence, integrated fish farming systems are based on A, B and C only.