Shrimp Growth Calculator
Calculate shrimp growth rate, specific growth rate, survival-adjusted biomass, harvest estimate, feed requirement, and FCR-based production planning for shrimp ponds, tanks, biofloc systems, and aquaculture farms.
Calculate Shrimp Growth
Your Shrimp Growth Result
Interpretation:
Practical recommendation:
Quick Formula Box
Specific growth rate (SGR) = [ln(Final weight) – ln(Initial weight)] ÷ Culture days × 100
Surviving shrimp = Shrimp stocked × Survival rate
Harvest biomass = Surviving shrimp × Final weight ÷ 1,000
Total feed estimate = Weight gain biomass × FCR
Shrimp Growth Reference Table
| Metric | Formula / Meaning | Best Use | Management Notes |
|---|---|---|---|
| ADG | Weight gain divided by culture days | Simple growth tracking | Useful for weekly sampling and harvest planning |
| SGR | Natural log growth rate per day | Comparing growth across sizes | More useful when shrimp size changes rapidly |
| Survival rate | Surviving shrimp divided by stocked shrimp | Production and harvest estimates | Low survival may hide good individual growth |
| Biomass | Number of shrimp × average weight | Feed, aeration, harvest planning | Total biomass drives oxygen and feed demand |
| FCR | Feed used divided by weight gain | Feed efficiency | Lower FCR is usually more efficient |
| Marketable biomass | Harvest biomass after buffer | Sales planning | Allows for grading, handling, and harvest loss |
| Feed cost | Total feed × feed price | Budget planning | Feed is often one of the largest grow-out costs |
| Net feed margin | Harvest value – feed cost | Quick production economics | Does not include seed, labor, power, pond prep, or other costs |
Step-by-Step Guide
- Select the shrimp type closest to your crop.
- Choose actual growth from samples or harvest projection mode.
- Enter initial average weight and final or target weight in grams.
- Enter culture days and number of shrimp or post-larvae stocked.
- Enter survival rate and expected FCR.
- Use Advanced Options for feed price, sale price, target ADG, and harvest buffer.
- Click Calculate to estimate ADG, SGR, biomass, feed needed, and value.
Shrimp Growth Calculator: Complete Guide
The Shrimp Growth Calculator helps shrimp farmers, aquaculture students, pond managers, hatchery planners, biofloc operators, and farm consultants estimate shrimp growth performance and harvest potential. Shrimp farming decisions are often driven by average body weight, survival, biomass, feed requirement, FCR, and market size. This tool combines those numbers into a simple, practical calculation.
What this tool does
This calculator estimates average daily growth, specific growth rate, surviving shrimp, harvest biomass, marketable biomass, total feed requirement, feed cost, harvest value, and simple net feed margin. It is useful for whiteleg shrimp, tiger shrimp, freshwater prawns, and general farmed shrimp planning.
Why shrimp growth tracking matters
Shrimp growth affects harvest timing, feed demand, pond carrying capacity, cash flow, and profitability. A crop may look healthy but still underperform if growth slows, FCR increases, or survival drops. Regular sampling helps farmers decide whether to continue growing, adjust feeding, reduce density, improve aeration, or harvest earlier.
Formula explanation
Average daily growth is calculated by subtracting initial shrimp weight from final shrimp weight and dividing by culture days. Specific growth rate uses natural logarithms to compare relative growth. Biomass is calculated by multiplying surviving shrimp by final average weight. Feed requirement is estimated by multiplying total weight gain biomass by feed conversion ratio.
ADG versus SGR
ADG is easy to understand because it shows grams gained per day. SGR is helpful when comparing growth across different shrimp sizes because small shrimp can grow at a higher relative rate than larger shrimp. In farm records, both numbers are useful: ADG helps with harvest planning, while SGR helps compare performance between crops, ponds, or feeding programs.
Survival and biomass
Survival rate is just as important as individual growth. A pond with excellent average body weight but poor survival may produce less total harvest than a pond with slightly smaller shrimp and better survival. Biomass combines shrimp count and weight, making it one of the most important numbers for feed, aeration, oxygen demand, carrying capacity, and harvest planning.
Practical applications
- Estimating shrimp growth rate from sampling data.
- Projecting harvest biomass from stocked PL, survival, and target weight.
- Estimating feed required from FCR and weight gain.
- Comparing pond performance across crops.
- Planning harvest timing based on target market size.
- Estimating feed cost and harvest value for a quick production check.
Tips and best practices
Sample shrimp consistently and use enough shrimp to get a reliable average weight. Track feed offered, tray response, mortality, water quality, molting, and weather changes. Recalculate biomass regularly as shrimp grow. Adjust feed carefully rather than making sudden large changes. Monitor dissolved oxygen at night and early morning, when risk is often highest.
Common mistakes to avoid
- Using estimated shrimp size without regular sampling.
- Ignoring survival when estimating harvest biomass.
- Feeding based on old biomass numbers after shrimp have grown.
- Assuming good ADG means good profitability if FCR is poor.
- Ignoring water quality, disease, and pond bottom condition.
- Waiting too long to harvest when growth slows and FCR worsens.
Expert recommendation
Use this calculator after each weekly or biweekly sampling. Compare calculated ADG, SGR, FCR, biomass, and feed demand against farm targets. If growth is below target, review feed quality, feeding trays, dissolved oxygen, alkalinity, salinity, temperature, stocking density, disease signs, and pond bottom condition before increasing feed.
Conclusion
The Shrimp Growth Calculator gives a practical estimate of growth, survival-adjusted biomass, feed demand, and harvest value. It helps turn shrimp sampling data into management decisions. The best shrimp crop is not just the one with the largest shrimp; it is the crop with strong survival, efficient FCR, stable water quality, and marketable biomass at the right harvest time.
FAQ
How do I calculate shrimp growth rate?
Subtract initial average shrimp weight from final average shrimp weight, then divide by culture days. This gives average daily growth in grams per day.
What is ADG in shrimp farming?
ADG means average daily growth. It shows how many grams each shrimp gains per day on average during the selected period.
What is SGR in shrimp growth?
SGR means specific growth rate. It uses natural logarithms to show relative growth percentage per day.
What formula does this calculator use for SGR?
SGR = [ln(final weight) – ln(initial weight)] ÷ culture days × 100.
How do I calculate shrimp biomass?
Multiply surviving shrimp by average shrimp weight, then divide by 1,000 to convert grams to kilograms.
Why is survival rate important?
Survival rate determines how many shrimp remain in the pond or tank. It strongly affects harvest biomass, feed demand, and final revenue.
How is feed requirement estimated?
The calculator estimates weight gain biomass, then multiplies it by feed conversion ratio to estimate total feed needed.
What is a good FCR for shrimp?
A good FCR depends on species, system, feed quality, and management. Lower FCR means feed is converted into shrimp growth more efficiently.
Can this calculator be used for vannamei shrimp?
Yes. Select whiteleg shrimp or vannamei and enter your sampling, stocking, survival, and FCR values.
Can this calculator be used for tiger shrimp?
Yes. Select tiger shrimp and use your farm-specific weights, survival, culture days, and feed data.
How often should shrimp growth be calculated?
Many farms calculate growth weekly or biweekly after sampling. More frequent calculations help adjust feeding and harvest planning.
Why is my shrimp growth slow?
Slow growth can come from poor water quality, low oxygen, disease, poor feed, high density, salinity stress, temperature stress, molting problems, or underfeeding.
Related Tools
Estimate daily shrimp feed requirement. Shrimp Stocking Density Calculator
Plan shrimp stocking by pond area. Feed Conversion Ratio Calculator
Measure feed efficiency. Aquaculture Biomass Calculator
Estimate total live biomass. Pond Carrying Capacity Calculator
Estimate safe pond biomass. Fish Feed Calculator
Estimate feed for fish systems. Pond Volume Calculator
Calculate pond water volume. Aquaculture Profit Calculator
Estimate crop revenue and costs. Survival Rate Calculator
Calculate survival percentage. Harvest Biomass Calculator
Estimate final harvest weight.
This calculator is an educational planning tool and should not replace farm sampling protocols, aquatic animal health advice, hatchery recommendations, water quality testing, feed manufacturer guidance, or professional aquaculture consulting.