Best Fish Species for Biofloc Farming in India
Biofloc packs 3-5x more fish per pond by turning tank waste into feed - but only species that thrive in dense, active water. See which ones work.
Vaibhav Dhama2 min readFish Profit CalculatorLive & free
Pond or tank size, stocking density, feed cost and survival rate in — cost per kg, revenue and net profit for the cycle, out — earthen pond or biofloc.
Understanding your results
The calculator above turns your pond size or tank count, stocking density, feed cost, survival rate and sale price into a complete grow-out cycle P&L. Here is what each number means.
Fish at harvest
Fingerlings stocked minus losses to mortality. This is the count that actually earns you money — every percentage point of survival you improve adds directly to the bottom line.
Total feed consumed
FCR × harvest weight × surviving fish. Feed is 50–60% of total cost in pond culture and even higher in biofloc, so a ₹1/kg change in feed price swings your profit significantly.
Net profit
Gross revenue (total harvest kg × sale price) minus all costs — seed, feed, pond preparation or tank electricity, medicine and labour. A positive number means the cycle paid for itself.
Cost per kg
Your total production cost divided by total harvest weight. Compare this against the market sale price — the gap is your margin. If cost per kg exceeds the local mandi rate, the cycle is losing money.
How the calculator works
A step-by-step look at the arithmetic behind the numbers, so you know exactly what is being computed.
- 1
Count surviving fish
Fingerlings stocked × (survival rate / 100). Mortality in earthen ponds is typically 15–25%; in well-managed biofloc it can be as low as 10–15%.
- 2
Estimate total harvest
Surviving fish × target harvest weight. This gives the total kilograms of fish you will send to market at the end of the grow-out period.
- 3
Calculate feed requirement
Total harvest kg × FCR. A Rohu with FCR 1.8 needs 1.8 kg of feed to produce 1 kg of fish. Lower FCR means more efficient feed use and lower cost per kg.
- 4
Add up all costs
Seed cost + feed cost + pond preparation (or tank electricity + probiotics) + medicine + labour + miscellaneous. Every head of expenditure is itemised so you can see where your money goes.
- 5
Compute profit
Gross revenue − total cost = net profit. The calculator also shows profit per kg and cost per kg so you can benchmark against your local market price.
Who is this calculator for?
Whether you run a 1-acre village pond or a 10-tank biofloc unit, the numbers work the same way.
First-time fish farmers
Planning your first grow-out cycle? Enter realistic inputs and see the capital you need, the break-even sale price, and whether the margins justify the investment before you dig the pond.
Existing pond operators
Already running a pond? Compare your actual FCR, survival and sale price against the defaults to spot where your economics leak — feed cost, mortality or an undersized pond.
Biofloc entrepreneurs
Biofloc needs higher upfront capital but offers higher density and faster turnover. Use the biofloc tab to project whether your tank layout, electricity cost and probiotic spend leave enough margin.
Extension officers & FPOs
Run the numbers in front of a farmer group to show how stocking density, FCR and sale price interact — a live demonstration is worth more than a pamphlet.
Tips for better results
Small changes in a few inputs can swing your fish farming profit by lakhs. Here are the levers that matter most.
Start with quality seed
Buy fingerlings from a certified hatchery. Undersized or diseased seed inflates mortality and drags down the survival rate that drives every number in this calculator.
Watch your FCR
Feed is your single largest cost. Use floating pellets, feed at fixed times and avoid overfeeding — even a 0.1-point improvement in FCR saves thousands per cycle on a 1-acre pond.
Manage water quality
Test dissolved oxygen, pH and ammonia weekly. Poor water quality causes stress, slows growth and raises mortality — all of which the calculator translates directly into lower profit.
Time your harvest
Sell when fish hit target weight and the market price peaks (usually festivals and wedding season). Holding fish beyond target weight wastes feed without proportional weight gain.
Do not overstock
Higher density means more fish per acre, but also more disease, slower growth and higher FCR. The stocking density defaults in this calculator are already at the practical limit for each species.
Negotiate feed in bulk
Feed is 50–60% of cost. Buy in season, store properly, and negotiate with the feed company for a volume discount — even ₹2/kg off makes a visible difference at scale.
Common mistakes
Mistakes that cost fish farmers money — and what to do instead.
Ignoring pond preparation cost
Skipping liming, desilting or manuring to save ₹10,000–15,000 seems cheap until disease wipes out 30% of your stock. Pond preparation is insurance, not overhead.
Do this instead: Budget ₹12,000–20,000 per acre for lime, mahua oil cake and basal manure before every stocking. Enter it in the calculator to see the true cost, not an optimistic one.
Overstocking the pond
Doubling the stocking density does not double the harvest — it raises FCR, lowers individual weight, spikes disease and can crash survival below 60%.
Do this instead: Stick to recommended densities: 5,000–6,000/acre for IMC, 8,000–10,000/acre for Pangasius. Run both numbers in the calculator to see the difference.
Using farm-made feed for the entire cycle
Farm-made feed (rice bran + oil cake) works for the first 2–3 months but its FCR is 3–4×, which means double the feed cost per kg of fish produced compared to floating pellets.
Do this instead: Switch to commercial floating pellets by month 3. Enter the blended FCR (e.g. 2.2 instead of 1.8) if you mix both — the calculator shows the real cost impact.
Selling at the wrong time
Distress-selling when the local mandi is flooded with fish drops your sale price by ₹20–40/kg. That can erase the entire profit on a 1-acre pond.
Do this instead: Track local wholesale rates and sell when demand peaks — festivals, wedding season, winter. Use the calculator with different sale prices to find your break-even.
Frequently asked questions
Quick answers to the questions we hear most from fish farmers using this calculator.
How much does it cost to start fish farming on 1 acre?
A typical first-year earthen pond needs ₹1.5–2.5 lakh for pond digging, seed, feed, lime and labour. The calculator breaks this down so you can see exactly where each rupee goes. Subsequent cycles cost less because the pond is already built.
What is FCR and why does it matter?
FCR (Feed Conversion Ratio) is the kg of feed needed to produce 1 kg of fish. Rohu has an FCR of about 1.8, meaning 1.8 kg of feed per kg of fish. Lower FCR = less feed cost = higher profit. Commercial floating pellets give a much better FCR than farm-made feed.
What survival rate should I expect?
Well-managed earthen ponds typically achieve 75–85% survival for IMC (Rohu, Catla, Mrigal). Biofloc tanks with proper aeration can reach 85–90%. Poor water quality or overcrowding can drop survival below 60%, which wipes out the profit.
Is biofloc more profitable than earthen ponds?
Biofloc has higher capital cost (tanks, aeration, probiotics, electricity) but also higher density and faster turnover. Per cycle, a well-run biofloc unit can match or beat pond economics on a per-kg basis, but the break-even takes longer due to setup cost. Use both tabs to compare.
How many grow-out cycles can I do in a year?
Earthen ponds typically support 1 full cycle of 8–10 months for IMC. Tilapia and Pangasius can do 2 shorter cycles. Biofloc tanks can run 2–3 cycles a year because temperature and feeding are controlled.
Which fish species is most profitable in India?
Pangasius offers the highest volume per acre due to dense stocking, but at a lower sale price (₹80–100/kg). Rohu fetches ₹120–160/kg but grows slower. Tilapia (GIFT strain) has the best FCR (1.4) and fast growth. Run each species in the calculator to compare for your local market.
What government subsidies are available for fish farming?
The Pradhan Mantri Matsya Sampada Yojana (PMMSY) provides up to 40% subsidy (60% for SC/ST and women) on pond construction, biofloc setup, feed mills and cold storage. State fisheries departments also run their own schemes. Check with your district fisheries officer.
How do I reduce feed cost in fish farming?
Use floating pellets (better FCR than sinking feed), feed at fixed times twice a day, avoid overfeeding (uneaten feed pollutes water), and buy in bulk during the off-season. Even a ₹2/kg saving on feed compounds into lakhs on a 1-acre pond.
What is the ideal stocking density for an earthen pond?
For composite fish culture (Rohu + Catla + Mrigal), CIFA recommends 5,000–6,000 fingerlings per acre. Pangasius can go up to 8,000–10,000/acre. Overstocking raises disease risk, worsens FCR and lowers individual fish weight.
Does the calculator account for pond digging cost?
The "pond preparation" field covers liming, desilting and manuring per cycle — not the one-time digging cost. If this is your first cycle, add the digging cost (₹1–2 lakh/acre) to the total and divide by the number of years you will use the pond to see the true annual cost.
How much electricity does a biofloc tank need?
A 12-ft biofloc tank with continuous aeration uses about 1.5–2 kW, running 18–20 hours a day. At ₹7/unit, that is ₹5,000–8,000 per tank per cycle. Enter your actual electricity cost to see how it affects profitability.
Can I mix species in the same pond?
Yes — composite fish culture (Rohu + Catla + Mrigal in a 40:30:30 ratio) is the standard CIFA recommendation for earthen ponds. Each species feeds at a different water column level, so they do not compete. Use the dominant species FCR and a blended average weight in the calculator.
Related guides
In-depth reading on fish farming, aquaculture and livestock economics.