Improving FCR in Shrimp Farming: How to Use Feed Conversion Ratio Correctly

The standard formula is: FCR = total feed used / biomass gained. If a pond used 10,000 kg of feed and gained 8,000 kg of shrimp biomass, the FCR is 1.25.

For shrimp ponds, biomass gained should account for the crop result, not just the final standing biomass. A practical farm formula is: FCR = total feed used / (harvested biomass + remaining biomass - initial stocked biomass). Many farms use initial stocked biomass as a small correction because post-larvae are tiny, but it is still more accurate to include it when the data exists.

For ponds with partial harvests, add every partial harvest to the biomass result. Otherwise the farm may overstate feed use against only the final harvest and make FCR look worse than it really was.

Feed conversion ratio is one of the most important production indicators because feed is a major operating cost in shrimp farming. A lower FCR usually means feed is being converted into shrimp biomass more efficiently, but the number only helps if feed and biomass records are accurate.

FAO material on vannamei notes that systems such as bacterial floc can reduce dependence on high-protein feeds and improve cost efficiency. That reinforces the practical point: FCR is connected to the whole culture system, not only the feeding table.

FCR can be distorted when feed movement is not recorded, mortality is missed, harvest weights are incomplete, or sampling overestimates biomass. Partial harvests can also confuse FCR if harvested biomass is not tied back to the pond cycle.

Farmers should avoid treating FCR as a standalone score. A pond with low growth and low feed use may look efficient but still miss the harvest target. A pond with high feed use and poor water quality may show the opposite problem.

Use FCR as a question generator. If FCR is rising, check appetite, tray returns, DO, ammonia, nitrite, mortality, and recent sampling accuracy. Improving FCR in shrimp farming usually comes from tighter feed records, better biomass estimates, cleaner tray interpretation, and earlier response to water-quality stress. If FCR improves sharply, check whether biomass or harvest records are complete before assuming performance improved.