Shrimp Feed Management: How to Improve FCR and Reduce Feed Cost

Shrimp Feed Management: How to Improve FCR and Reduce Feed Cost

Feed management is one of the most important parts of successful vannamei shrimp farming.

Feed is also a major operating expense. MPEDA states that feed can account for around 50–60% of operating costs, which means even a small improvement in feed efficiency can have a significant effect on farm economics.

The goal is to provide:

The right feed + the right quantity + the right timing + the right distribution + regular monitoring

When feed management is poor, uneaten feed can increase organic loading and contribute to water-quality problems. When feeding is too low, shrimp growth can suffer.

What Is FCR in Shrimp Farming?

FCR stands for Feed Conversion Ratio.

It indicates how much feed is used in relation to the shrimp biomass produced.

Basic formula

FCR = Total feed used ÷ Total shrimp biomass produced

For example:

If a farm uses 12,000 kg of feed and harvests 10,000 kg of shrimp:

FCR = 12,000 ÷ 10,000

FCR = 1.20

So the farm has an FCR of 1.20.

Why Is FCR Important?

FCR directly affects feed expenditure.

Consider a simple example:

Shrimp production = 10,000 kg

At FCR 1.20

10,000 × 1.20 = 12,000 kg feed

At FCR 1.50

10,000 × 1.50 = 15,000 kg feed

Difference:

3,000 kg feed

If feed costs ₹100/kg, the difference would be:

3,000 × ₹100 = ₹3,00,000

This is only an illustration. Actual feed prices and farm performance vary.

The example shows why controlling feed waste can have a meaningful financial impact.

Select a Good-Quality Feed

Start with a feed appropriate for the species, shrimp size and farming system.

When buying feed, check:

Feed type and pellet size

Manufacture date

>Batch number

Packaging condition

Storage condition

Suitability for the shrimp size

Store Shrimp Feed Properly

Good feed can lose quality when it is stored badly.

Feed-storage checklist

☐ Keep bags on pallets

☐ Protect from rain and moisture

☐ Avoid direct sunlight

☐ Maintain ventilation

☐ Keep the store clean

☐ Control rodents

☐ Keep chemicals and fuel away from feed

☐ Follow first-in, first-out stock rotation

Do not allow feed bags to remain directly on a damp floor.

Choose the Correct Feed Size

Shrimp feed should match the size and developmental stage of the shrimp.

Using a pellet that is too large can reduce feed consumption and increase waste.

Using feed that is too small can make distribution less efficient.

Follow the feed manufacturer's recommendations as a starting point, then adjust the feeding program based on actual shrimp response, sampling and feed-tray observations.

Establish a Feeding Schedule

Shrimp feeding should follow a planned schedule rather than random feeding

Feeding frequency should depend on:

Shrimp size

Biomass

Pond conditions

Feed type

Feeding response

Water quality

Farm feeding system

Feed According to Shrimp Biomass

One of the biggest mistakes in shrimp farming is treating a feeding chart as a fixed number throughout the crop.

The required feed changes as shrimp grow.

Basic approach

Estimated biomass → feeding rate → daily feed quantity

Use Feed Trays

Feed trays are one of the most useful tools for controlling feed waste.

MPEDA recommends installing feed trays after about 10 days of stocking and monitoring feeding from around the 20th day onward.

A tray allows the farmer to observe whether feed is being consumed.

If feed is completely consumed

The feeding quantity may need to be reviewed upward, depending on the overall feeding response.

If significant feed remains

The feeding quantity should generally be reduced and the reason investigated.

**Do Not Judge Feeding From One Tray Alone

**

A common mistake is to put one tray in the pond and assume it represents every shrimp.

Shrimp distribution can vary throughout a pond.

Use:

Properly positioned trays

Multiple observation points where appropriate

Regular cast-net or sampling methods

Shrimp behavior

Water quality

Pond-bottom condition

Spread Feed Properly

Feed distribution is just as important as feed quantity.

During the early culture period, MPEDA recommends spreading feed within roughly 2–4 metres of the pond edge

Avoid repeatedly feeding in:

Black-bottom areas

Bad-smelling areas

Sludge accumulation zones

Corners where feed is likely to accumulate

Sample Shrimp Regularly

Regular sampling is essential for good feed management.

MPEDA recommends weekly shrimp sampling after around 45 days to assess growth and calculate FCR.

Measure:

Average body weight

Size distribution

Estimated survival

Biomass

Feed consumption

FCR

Calculate Feed Requirement

Once estimated biomass is available, a feeding program can be developed.

For example:

Estimated biomass = 3,000 kg

Suppose the farm's current feeding program calls for a 3% daily ration as an example:

3,000 × 3%

= 90 kg feed/day

Adjust Feed Based on Pond Conditions

Feed consumption can change when shrimp are stressed.

MPEDA recommends reducing feeding during periods including:

Low dissolved oxygen

Plankton crash

Rainfall

Molting

Extreme temperature

Disease outbreaks

This is an important principle:

Do not continue feeding the same quantity when pond conditions have suddenly changed.

Instead:

Check the problem → assess shrimp behavior → observe feeding response → adjust feed appropriately

Watch Dissolved Oxygen

Dissolved oxygen is closely linked with feeding activity.

Important

Never reduce aeration just to make feeding easier if doing so puts shrimp at risk.

Aeration and feeding schedules should be coordinated according to pond biomass, DO levels and the farm's aeration plan

Watch the Pond Bottom

Feed that reaches the bottom but is not consumed becomes part of the pond's organic load.

Regularly inspect the feeding area.

Look for:

Black soil

Bad odor

Accumulated organic matter

Benthic algae

Uneaten feed

Simple rule

Poor pond bottom → investigate feed quantity first

Avoid Overfeeding

Overfeeding is one of the easiest ways to increase feed costs.

Suppose you are giving an extra:

5 kg feed/day

Over 100 days:

5 × 100 = 500 kg extra feed

At ₹100/kg:

500 × ₹100 = ₹50,000

Again, this is an illustration

**Avoid Underfeeding Too

**

Reducing feed aggressively is not automatically good management.

If the crop is genuinely consuming the available feed and growing well, excessive feed restriction may affect growth.

The objective is not:

"Use the least feed possible."

The objective is:

"Use the amount of feed required for healthy growth with minimum waste."

Manage Feeding During Molting

During molting, feeding behavior can change.

MPEDA recommends reducing feeding during molting periods when appropriate.

Farmers should observe:

Feeding response

Soft-shell shrimp

Reduced activity

Feed-tray response

Water quality

Rather than making large automatic changes, adjust feeding based on actual observations.

Adjust Feeding After Heavy Rain

Rainfall can cause rapid changes in:

Salinity

Temperature

pH

Water stratification

Shrimp behavior

After significant rainfall:

Check water quality → observe shrimp → check feeding response → adjust accordingly

Monitor FCR Throughout the Crop

Do not calculate FCR only after harvest.

Track it periodically.

Cumulative FCR formula

Cumulative FCR = Cumulative feed used ÷ Estimated shrimp biomass gain

Compare Feed Intake With Growth

Suppose two weeks of feeding records show:

Week Feed Used Estimated Biomass Gain

Week 1 1,000 kg 800 kg

Week 2 1,200 kg 1,000 kg

The simple feed-to-gain ratios would be:

Week 1:

1,000 ÷ 800 = 1.25

Week 2:

1,200 ÷ 1,000 = 1.20

The second week shows better feed efficiency based on those estimates.

Keep a Daily Feed Register

Every feeding should be recorded.

Also record:

Weather

Rainfall

DO

pH

Shrimp behavior

Mortality

Health observations

Feed adjustment

Good records make it easier to identify why FCR changes.

Manage Feed Quality Until It Reaches the Pond

Feed quality can be affected not only at the factory but also by farm handling.

Avoid:

Wet bags

Moldy feed

Damaged packaging

Long exposure to sun

Poor storage

Mixing old and fresh stock without tracking

Keeping feed beside chemicals

Practical Ways to Improve FCR

1. **Use fresh, good-quality feed

**

Poor-quality or improperly stored feed can reduce feed efficiency.

1. Match feed size to shrimp size

Make it easy for shrimp to consume the feed.

3. Use feed trays

Observe actual consumption rather than relying only on a chart.

1. **Sample shrimp regularly

**

Update biomass and growth estimates.

5.** Control overfeeding

**

Small daily wastage can become a major cost.

1. Feed according to conditions

Rain, low DO, temperature stress, molting and disease can change feed consumption.

1. Maintain good water quality

Healthy shrimp generally provide a more reliable feeding response.

8. Keep feeding areas clean

Avoid feeding heavily where the pond bottom is deteriorated.

1. Record everything

Use daily data to adjust feeding.

1. Review FCR regularly

Do not wait until harvest to discover that feed efficiency has deteriorated.

How to Reduce Shrimp Feed Cost

Reducing feed cost does not necessarily mean buying cheaper feed.

A better approach is to reduce feed wastage and unnecessary feed consumption.

Feed-cost formula

Total feed cost = Total feed used × Feed price/kg

For example:

12,000 kg feed × ₹100/kg

= ₹12,00,000

If better management reduces unnecessary feed use by 500 kg:

500 × ₹100

= ₹50,000 saved

Actual savings depend on feed price and farm performance.

**Cheap Feed vs Efficient Feed

**

A lower-priced feed is not necessarily cheaper overall.

Consider:

Feed A

Price = ₹95/kg

FCR = 1.60

Feed B

Price = ₹105/kg

FCR = 1.30

Illustrative feed cost per kg of shrimp produced:

Feed A: ₹95 × 1.60 = ₹152/kg shrimp

Feed B: ₹105 × 1.30 = ₹136.50/kg shrimp

**What Is a Good FCR for Vannamei?

**

There is no single FCR that applies to every farm.

FCR depends on:

Feed quality

Shrimp size

Survival

Stocking density

Natural pond productivity

Water quality

Feed management

Sampling accuracy

Culture system

Feed Management During Disease Problems

When shrimp show abnormal behavior, reduced feeding or mortality, do not continue the same feeding program blindly.

Start with:

Observe → Test water → Check shrimp → Review feed response → Investigate disease risk → Adjust feeding

Common Shrimp Feeding Mistakes

Feeding by guesswork

A feeding chart is a starting point, not a substitute for observation.

Ignoring feed-tray response

Uneaten feed is a warning sign that needs investigation.

Increasing feed after every good tray observation

One good feeding result does not automatically justify a large increase.

Ignoring water quality

Shrimp may consume less feed when stressed.

Feeding in dirty areas

Organic-rich pond-bottom areas should be avoided.

Using old feed

Feed quality declines with poor storage and prolonged storage.

Adding unnecessary feed additives

Fresh, quality feed does not automatically need additional ingredients.

Not recording feed

Without records, FCR cannot be evaluated properly.

Daily Shrimp Feed Management Checklist

Before feeding

☐ Check DO

☐ Observe shrimp activity

☐ Check recent weather/rainfall

☐ Review previous feeding response

☐ Inspect water quality

During feeding

☐ Use the correct pellet size

☐ Distribute feed evenly

☐ Avoid dirty pond-bottom areas

☐ Observe feeding trays

☐ Record feed quantity

After feeding

☐ Check tray response

☐ Look for excessive uneaten feed

☐ Review shrimp behavior

☐ Adjust the next ration when necessary

Weekly

☐ Sample shrimp

☐ Estimate biomass

☐ Review growth

☐ Calculate/update FCR

☐ Review cumulative feed use

☐ Check pond-bottom condition

**Simple FCR Example for Farmers

Suppose:**

Total feed used: 15,000 kg

Harvested shrimp: 12,000 kg

Then:

FCR = 15,000 ÷ 12,000

FCR = 1.25

Now suppose the farm produced the same 12,000 kg using only 13,200 kg feed:

13,200 ÷ 12,000 = 1.10

Difference in feed:

15,000 − 13,200 = 1,800 kg

This demonstrates how improving feeding efficiency can reduce feed usage without necessarily requiring an increase in production.

A Simple Formula for Your Aqua Culture Guide Website

This article would work very well with an online Shrimp FCR Calculator.

Inputs

Total Feed Used: ____ kg

Shrimp Production: ____ kg

Output

FCR = Total Feed ÷ Shrimp Production

Example

Feed = 10,000 kg

Production = 8,000 kg

FCR = 1.25

You can also add a second calculator:

Feed Cost Calculator

Feed Quantity × Feed Price = Total Feed Cost

And a third:

Daily Feed Calculator

Estimated Biomass × Feeding Rate (%) = Daily Feed Requirement

Conclusion

Good shrimp feed management is about efficiency, not simply reducing feed.

The farmer's goal should be to provide enough feed for healthy shrimp growth while minimizing uneaten feed and unnecessary expenditure.

The most important practices are:

Use good-quality feed → store it properly → match feed to shrimp size → distribute it correctly → use feed trays → sample shrimp regularly → monitor water quality → adjust feeding when conditions change → calculate FCR → maintain accurate records.