Definition: Sustainable aquaculture system where beneficial microbes convert waste (uneaten feed, fish excreta) into protein-rich “bioflocs,” which serve as natural fish feed.
Principle: High C:N ratio maintained by adding carbon sources (molasses, wheat bran, etc.), promoting heterotrophic bacteria that recycle nitrogenous waste.
Benefits:
Low/no water exchange → saves water, reduces pollution.
Enhances feed efficiency and growth rates.
Cost-effective, as biofloc acts as supplementary feed.
Reduces disease risks by maintaining better water quality.
Suitability: Works best in warm climates, high-density farming, especially for species like Tilapia, Pangasius, Singhi, Shrimp.
Nickname: Known as “green soup” or heterotrophic ponds in aquaculture circles.
Adoption under PMMSY: Thousands of biofloc units approved with subsidies for farmers to promote climate-smart and resource-efficient aquaculture.