Biofloc Technology and Fish Farming Subsidy is considered as new “blue revolution” since nutrients can be continuously recycled and reused in the culture medium, benefited by the minimum or zero-water exchange BFT is an environment friendly aquaculture technique based on in-situ microorganism production. Biofloc is the suspended growth in ponds/tanks which is the aggregates of living and dead particulate organic matter, phytoplankton, bacteria and grazers of the bacteria. – subsidy for fisheries
It is the utilization of microbial processes within the pond/tank itself to provide food resources for cultured organism while at the same time acts as a water treatment remedy
How Biofloc Technology works?
- Biofloc system is a wastewater treatment which has gained vital importance as an approach in aquaculture.
- The principle of the technique is to maintain the higher C-N ratio by adding carbohydrate source and the water quality is improved through the production of high quality single cell microbial protein
- In such condition, heterotrophic microbial growth occurs which assimilates the nitrogenous waste that can be exploited by the cultured species as a feed and also works as bioreactor controlling of water quality.
- Immobilization of toxic nitrogen species occurs more rapidly in biofloc because of the growth rate and microbial production per unit substrate of heterotrophs are ten-times greater than that of the autotrophic nitrifying bacteria.
- This technology is based on the principle of flocculation within the system
How to Prepare the Inoculum?
Step 1: Take clean tub/can with 130 Litres of water and continue vigorous aeration
Step 2: Add 20 Litres of pond water/RAS water (before filtration) + 30 gm of carbon source (Jagerry /Wheat flour /Tapioca flour) + 10 gm of probiotic (with Bacilus Sp., Aspergilus Sp. etc with a total concentration of 10×109 CFU/gm)
Technical Specifications- 100 m3 (7 Tanks)
| Component | Details |
| Area for 7 tanks | 200 m2 |
| Biofloc Tank size | 4 metre diameter and 1.5 meter height (1.20 m water depth) |
| Water holding capacity of each tank | 15,000 Litres capacity |
| Water quality parameters | Dissolved Oxygen-5mg/L, Temparature-26-34°C, pH-7.5 to 8, TDS-600ppm, Floc density-25-40 mg/l, Ammonia-0.5 ppm, Nitrite-0.3 ppm, Nitrate-150 ppm, Alkalinity-120-280 ppm |
| Tanks Made-up of | Tarpaulin/Fibre/HDPE |
| Stocking density | 100 nos/m3 (1000 no.s per 15,000 litres tank – depending on species ) |
| Species cultured | GIFT Tilapia (Oreochromis niloticus) |
| Survival (%) | 80 |
| Type of feed to be used | floating pellet feed |
| % of feed | 2-3% per Average Body weight |
| Feeding frequency | 4 times early stage, later 2 times per day |
| FCR | 1:1.2 |
| Duration of culture | 6 months |
| Size/weight of the species(gm) | 500 gm average weight |
| No. of crops per year | 2 |
| Production | 4.2 Tonnes per crop (600kg per tank per crop) |
| Farm gate price(Rs) | 130/- kg fish |
| Capital cost | 6.00 Lakhs |
| Total project cost | 7.5 lakh |
Biofloc Scheme under PMMSY
An estimated investment of Rs. 20,050 crore for a period of 5 years from financial year (FY) 2020-21 to FY 2024-25 in all States/Union Territories.
Implementation
Central Sector Scheme: individual/group activities are undertaken by the entities of central government including NFDB, the central assistance will be up to 40% of the unit/project cost for General category and 60% for SC/ST/Women category.
Centrally Sponsored Scheme (CSS) : North Eastern & Himalayan States: 90% Central share and 10% State share. Other States: 60% Central share and 40% State share.
| Beneficiary oriented sub-components and activities | ||||
| S.no | Sub-component and activities | Unit | Unit cost (Rs. Lakhs) | |
| Development of inland fisheries and aquaculture | ||||
| 1. | Construction of biofloc ponds for brackish water/saline/alkaline areas including inputs of rs.8 lakhs/ha | 0.1 ha | 18.00 | |
| 2. | Construction of biofloc ponds for freshwater areas including inputs of rs.4 lakhs/ha | 0.1 ha | 14.00 | |
| Technology infusion and adaptation | ||||
| 1. | Biofloc (50 tanks of 4m dia and 1.5 high) culture system. (No) 50.00 120 5. | (No) | 50.00 | 120 |
| 2. | Biofloc culture system | (No) | 25.00 | 120 |
| 3. | Biofloc (7 tanks of 4m dia and 1.5 high) culture system | (No) | 7.50 | 121 |
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