What We Share Here
Working notes from the field, not theory copied out of a book
Fish farming at high stocking density fails not because of too little feed, but because of numbers that are never measured. Ammonia read without pH, aeration sized from fish count alone, and grading that keeps getting put off.
The seven modules below work through those numbers one by one, with the formulas, safe-range tables, and worked examples you can copy straight away.
Fully open
No locked modules, no registration form, no request for your phone number.
Numbers, not guesswork
Every recommendation comes with its working range, its unit, and the reason behind it.
Easy to read on a phone
Every table and diagram adapts to a small screen, so you can open it while standing in the field.
Free to use for teaching
Copy it for farmer groups, school modules, or internal training.
7 Fish Farming Modules
Read them in order, or go straight to the one you need
Water Quality
Eight numbers that decide whether your fish live or die, and why your ammonia test can mislead you.
- Safe ranges for eight water parameters
- Toxic ammonia table against pH and temperature
- How to measure DO properly
- Stabilizing pH through alkalinity
Nitrogen Cycle and Biofloc
Where the nitrogen from feed goes, and how to calculate the carbon you have to add, not guess at it.
- Three routes ammonia leaves the pond by
- Formula and worked example for the molasses dose
- Ten-day protocol for preparing the pond
- Reading floc volume with an Imhoff cone
Aeration and Oxygen
Why sizing aeration from fish count alone is the mistake that most often turns fatal.
- Four oxygen consumers in the pond
- Low-oxygen symptoms stage by stage
- Sizing the blower from water volume
- Emergency response and backup power
Fingerlings, Stocking Density, Grading
Choosing fingerlings, moving them without killing them, and grading before the big ones eat the small ones.
- Signs of good fingerlings and which ones to reject
- Six-step acclimation
- Stocking density for tilapia and catfish by system
- Grading schedule and technique
Feed, Growth, FCR
Measuring feed from the fish's actual weight, not from a guess, then judging the result through FCR.
- Daily dose by fish size
- Weight sampling with a worked example
- Calculating and reading FCR
- Four feeding mistakes
Disease and Biosecurity
Recognizing a disease from where its symptoms sit, using treatment doses safely, and stopping it at the gate.
- Seven diseases with their symptoms and triggers
- Doses for salt, potassium permanganate, formalin
- Safety warnings that must not be broken
- Six biosecurity habits
Harvest and Post-Harvest
The two things that decide market quality have to start days before the fish come out of the pond.
- Purging time according to purpose
- Clearing off-flavor and what causes it
- Harvesting without damaging the fish's slime coat
- Live fish transport
The Learning Order We Suggest
If you are truly starting from zero
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Master the water first
Module 1. Almost every failure starts here, and almost all of it can be prevented if you get used to measuring before anything gets sick.
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Understand where the ammonia goes
Module 2. This is what sets biofloc apart from an ordinary pond, along with how to calculate the molasses dose correctly.
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Make sure the aeration can carry it
Module 3. High stocking density without enough aeration only delays the loss.
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Only then stock the fingerlings
Module 4. Once the pond is ready, then you choose fingerlings, acclimate them, and set a grading schedule.
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Manage the feed and watch the health
Module 5 and Module 6 run alongside each other through the whole cycle.
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Finish it properly
Module 7. The two things that decide the selling price have to start days before harvest.
Equipment You Need to Prepare
These four decide the outcome, the rest can come later
DO meter
The most decisive tool in fish farming. Oxygen is the one thing that can kill a whole pond overnight.
pH meter and ammonia test kit
Ammonia must never be read without pH beside it. The two always go in pairs.
Imhoff Cone
For measuring floc volume. Without it, managing biofloc is just guessing from the color of the water.
Scale and sampling net
The feed dose is worked out from the actual weight of the fish, and that weight can only be known by weighing.
Questions About This Training
Before you start reading
Is this fish farming training really free?
Genuinely free. No cost, no need to register, and no module is locked. All of the material is open and can be read from a phone at the pond edge.
We opened it because a pond managed properly benefits everyone, including the people who buy fish in Cirebon.
Which fish is this material for?
Mainly tilapia and catfish, the two most widely farmed freshwater species in Indonesia. Most of the principles also apply to pangasius, gourami, and tambaqui.
What you need to adjust are the stocking density figures and the tolerance for low oxygen, because those two differ a lot between species. Catfish, for example, tolerate two to three times the density tilapia can.
Can it be used for an ordinary tarpaulin pond rather than biofloc?
Yes. The modules on water quality, aeration, fingerlings and grading, feed and FCR, disease, and harvest apply to every pond system.
The only biofloc-specific one is Module 2 on the nitrogen cycle and the carbon calculation. It is still worth reading, because it explains where ammonia goes in any pond.
What is the minimum equipment I need?
A DO meter, a pH meter, an ammonia test kit, an Imhoff cone if you use biofloc, and a scale for sampling. Plus a blower that is big enough, along with backup power for it.
The DO meter is the most decisive one. Oxygen is the only thing that can empty a whole pond overnight, and no symptom shows up early enough to save it if you are not measuring.
Is there a certificate after finishing the modules?
No. This is open reading material, not a certified training program, and we do not want to suggest otherwise.
What you can take home is the material itself. Copy it to teach groups of fish farmers or to put together extension material, as long as the source is credited.
Other Tracks and Tools
All free
Hydroponics Training
Growing vegetables and fruit without soil, from choosing a system to steering plant growth.
AB Mix Nutrient Calculator
Work out the stock solution dose for your reservoir volume, or blend your own from single fertilizers sold in Indonesia.
Biofloc Pond Calculator
Pond volume, how many fingerlings fit, feed and molasses needs, through to a harvest estimate.
Something You Want to Ask
If any part is not clear or you want a new module on a particular topic, tell us.