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12/09/2025

The Problem with Using Rough Nets on Catfish Skin

When catfish are handled with rough or poorly made nets, it is more than just a small inconvenience, it directly damages their protective skin and mucus layer. That layer is the fish’s first line of defense against bacteria, fungi, and parasites. Once it’s injured, diseases take hold easily, leading to high losses later.

1. Loss of Protective Mucus

Catfish naturally produce a slimy coating that protects their skin from pathogens. Rough nets scrape this coating away. Without it, the fish are exposed and vulnerable.

👉 Farmers often notice that after grading or transfer with bad nets, outbreaks of bacterial infections or fungus follow within days.

2. Physical Wounds Become Infection Points

Nets with coarse material, sharp knots, or frayed edges cut into the fish’s skin. Even tiny scratches provide the perfect entry for Aeromonas, Pseudomonas, and fungi. What starts as a small bruise quickly turns into red sores or ulcers.

3. Stress and Slow Recovery

Handling already stresses catfish. Add skin injuries on top, and recovery becomes slower. Stressed fish eat less, resist disease poorly, and show uneven growth compared to those handled gently.

4. Market Losses

Even if the fish survive, injured or scarred skin reduces their market appeal. Buyers prefer healthy-looking fish, and wounds lower the price you can sell for.

How to Avoid This Problem
• Always use soft, knotless, or fine-mesh nets designed for fish handling.
• Inspect nets regularly for frays or broken threads that can injure fish.
• Wet the net before scooping, this reduces friction and damage to skin.
• Handle fish calmly and avoid overcrowding them in the net.

Final Word

Rough nets may seem harmless, but they silently eat into your profits by weakening fish, spreading disease, and reducing market value. Investing in good nets and proper handling saves you far more than it costs, because healthy fish mean higher survival, faster growth, and better sales.

10/09/2025

Red Sores on Catfish Skin, What They Signal

Red sores on catfish skin are a classic sign of bacterial infection, most often caused by Aeromonas or Pseudomonas. They are not random injuries but indicators of deeper problems with water quality, parasite irritation, or stress in your system. Once they appear, the disease is already progressing, and if not managed, losses can escalate quickly.

1. Bacterial Infections (The Main Cause)

These bacteria are always present in pond environments, but they only attack when fish are stressed or their skin barrier is weakened. The infection starts as small red patches and then develops into open ulcers, eating deeper into the flesh.

👉 This is why you may see one or two fish affected first, then many more in the following days.

2. Poor Water Quality Weakens Fish

When ponds are overloaded with waste, ammonia builds up. This irritates the skin and gills, making fish vulnerable to bacterial invasion. A pond bottom filled with sludge is the perfect breeding ground for this problem.

👉 Farmers who keep water clean and rest ponds between cycles rarely face outbreaks.

3. Parasites as Entry Points

Parasites such as protozoans or flukes can scratch and irritate fish skin. These small wounds create the perfect opening for bacteria. That is why parasitic infestations often go hand in hand with red sores.

4. Physical Injuries That Get Infected

Handling fish roughly during grading, or having sharp edges inside tarpaulin ponds, can cause scratches. In a clean pond, these may heal, but in dirty water they quickly turn into red bacterial sores.

5. What Red Sores Mean for Your Farm
• Affected fish eat less and lose weight.
• Open wounds expose them to secondary infections, raising mortality.
• Fish with sores lose market value, buyers reject them.

Steps to Take Immediately
• Check and improve water quality: Replace part of the water, reduce sludge, and increase oxygen.
• Salt treatment: Controlled salt baths help reduce bacterial load and soothe skin.
• Reduce stress: Stop rough handling and manage stocking density.
• Inspect gills and internal organs: If sores are widespread, you may need targeted antibacterial treatment under expert guidance.

Long-Term Prevention
• Avoid overstocking, crowding stresses fish and damages skin.
• Feed properly, don’t overfeed and let waste rot.
• Rest ponds between cycles, sun-drying reduces bacteria and parasites.
• Handle fish gently during sorting and transport.

Red sores are not random scratches, they are early signals of bacterial ulcer disease linked to poor management or parasites. Farmers who act immediately save their stock and protect their profits. Those who delay often face heavy losses, both in numbers and market value.

09/09/2025

Why Catfish Suddenly Float with Their Mouths Open at the Surface

If you walk to your pond one morning and see your catfish floating near the surface with mouths wide open, gasping, this is one of the clearest distress signals your fish can give you. Many farmers panic when they see it, but understanding why it happens will help you save your stock before things get worse.

1. Low Oxygen Levels (The Number One Cause)

At night, plants, algae, and even the fish themselves use up oxygen. By early morning, oxygen can drop so low that the fish struggle to breathe. Since gills aren’t getting enough oxygen from the water, the fish rush to the surface, opening their mouths to gulp air directly.

👉 This is most common in overstocked ponds, or in tarpaulin/earthen ponds without proper water exchange or aeration.

2. Sudden Changes in Water Quality

When ammonia or nitrite levels rise due to waste buildup, the fish’s gills become damaged. Even if oxygen is present, the gills can’t extract it properly, so the fish float up and gasp.

👉 Farmers sometimes confuse this with just “low oxygen,” but in truth, it’s water poisoning from poor management.

3. Temperature Stress

Hot afternoons or shallow water bodies warm up quickly. Warm water holds less oxygen. The hotter it gets, the less oxygen your fish can use, forcing them up to the surface, mouths open, desperate for air.

4. Gill Diseases or Parasites

Diseases like gill rot, or parasites that attack the gills, also make it hard for fish to absorb oxygen. In such cases, you may notice the fish gasping even when your water looks clean. If you inspect the gills, they may look pale, swollen, or have mucus and rotten patches.

5. Handling or Chemical Stress

If you’ve just applied treatments, fertilizers, or even changed water suddenly, your fish may float and gasp as they adjust to the shock. Poor handling during sorting or transport can also damage gills, producing the same effect.

What to Do Immediately When You See This
• Increase oxygen right away. Splash fresh water into the pond or connect an aerator if you have one.
• Change part of the water. If the pond smells bad or looks dirty, replace a portion with clean water to dilute toxins.
• Check your fish gills. Net one or two and look at the gills. Healthy gills are bright red; pale, whitish, or rotten gills mean disease.
• Stop feeding temporarily. Feeding in stressful water makes conditions worse. Wait until the fish recover.

How to Prevent This Problem Long-Term
• Avoid overstocking. Too many fish = too little oxygen.
• Don’t overfeed. Wasted feed rots and spoils water.
• Rest ponds between batches to refresh the environment.
• Provide shade or deeper water to reduce overheating.
• Monitor water regularly, especially in the early morning and late afternoon.

When catfish float with mouths open at the surface, they are crying out for help. Whether it’s low oxygen, dirty water, or diseased gills, the message is the same, something is wrong in the pond. Farmers who act fast can save their stock. Farmers who delay usually wake up to floating bodies.

08/09/2025

Egg Fungus: The White Cottony Growth that Destroys Catfish Eggs

If you’ve ever tried hatching catfish eggs and woken up to see a white, cotton-like growth spreading across your egg batch, then you’ve already met the egg fungus. Many farmers don’t fully understand what it is, why it spreads so fast, or how to stop it before it wipes out almost the entire spawn.

1. What Exactly is Egg Fungus?

That white cottony growth you see is caused by water molds (like Saprolegnia) that attack dead or unfertilized eggs. Once they establish themselves, they don’t stop at just the bad eggs, they spread quickly onto healthy, fertilized ones, suffocating and killing them.

👉 This is why even if only a few eggs go bad, the whole batch can still fail if you don’t act fast.

2. Why Egg Fungus Spreads So Quickly
• Dead or unfertilized eggs left behind: They become the breeding ground for fungus.
• Poor water circulation: Without gentle flow, fungus spores easily settle and spread.
• Dirty incubation trays or equipment: Any contamination increases the risk.
• Low oxygen in incubation tanks: Weak eggs suffocate and die, giving fungus an easy entry point.

3. The Silent Damage Farmers Don’t See Immediately

Egg fungus doesn’t just kill eggs, it reduces hatch quality. Fry that do manage to hatch from affected batches are often weak, small, and more prone to disease. Farmers lose not just in numbers, but also in the strength of their fingerlings.

4. How to Prevent Egg Fungus (Before It Even Starts)
• Remove dead eggs early: Regularly check incubation trays and siphon out eggs that turn opaque or whitish.
• Maintain good water flow: A gentle current keeps spores from settling on eggs.
• Keep everything clean: Always disinfect hatchery equipment before use.
• Use antifungal treatments: In many hatcheries, mild solutions like methylene blue or formalin are applied carefully to protect eggs.

5. What to Do If You Already See Fungus
• Act immediately, siphon out all dead or visibly infected eggs.
• Improve water circulation to reduce fungal spread.
• Treat the incubation water with recommended antifungal agents (dosage must be correct; overdosing will kill healthy eggs).
• Increase dissolved oxygen levels so the healthy eggs don’t weaken and die off.

Not all fungus outbreaks are from bad eggs alone. Sometimes, it’s poor broodstock handling. If the female was stripped late, or the milt was weak, many eggs will be unfertilized, making fungus outbreaks more likely. So proper timing and healthy males matter just as much as cleaning and treatments.

That white cottony growth on your catfish eggs is a warning that your hatchery practices need tightening. Egg fungus starts small but spreads like wildfire, suffocating healthy eggs and reducing hatch quality.

05/09/2025

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Protein Efficiency Ratio Explained: What Snail Diets Teach Farmers About Protein Use

When some farmers buy feed, they often focus only on crude protein levels. If a bag says “40% protein,” many assume it must be good feed. But the real question is: How much of that protein is actually turned into fish flesh?

This is where the Protein Efficiency Ratio (PER) becomes important. PER tells us how well fish are converting the protein they eat into body weight. In simple words:

👉🏾 PER = Weight gained ÷ Protein eaten

A higher PER means the fish are using protein more efficiently. A lower PER means protein is being wasted.

What we found in our snail meal trial

In one of our studies comparing fishmeal and Achatina fulica (African giant land snail, “Congo meat”), the PER values revealed an important lesson:
• Control diet (100% fishmeal): Good growth, good PER.
• 25% snail meal substitution: PER was not significantly different from the control, meaning protein from snail meal was used just as efficiently as protein from fishmeal.
• 50–100% snail meal substitution: PER dropped. The fish were not converting protein as effectively anymore.

This shows that snail meal protein is very good, but only up to a certain level. When you replace all the fishmeal, efficiency falls, likely due to palatability or digestibility issues at high levels.

Why this matters to farmers

👉🏾 Feed cost vs protein use
A feed can be cheap but if the protein inside it is wasted, you lose in the end. At 25% snail meal inclusion, farmers got both benefits: lower feed cost and efficient protein use.

👉🏾 Growth quality
Because protein from snail meal was well-utilized at moderate levels, fish flesh showed higher protein content and lower fat. That means not just more fish, but better quality fish.

👉🏾 Smart substitution, not total replacement
The PER data clearly tells us: don’t go overboard. Snail meal is best as a partial substitute (25%), where efficiency is maximized.

Putting numbers in context
• Snail meal protein: 69.44%
• Fishmeal protein: 56.71%
• PER at 25% substitution: Same as 100% fishmeal diet.
• Cost savings: Feed cost dropped from 544 FCFA (₦875)/kg to much less per kilogram of fish gained when snail meal was included at 25%.

So even though snail meal has more protein on paper, it’s the PER that proves whether that protein truly benefits the farmer. And the evidence is clear, snail meal works perfectly at the right level.

Take-home message: Farmers shouldn’t just chase high protein percentages on feed labels. What matters most is how well fish use that protein. With snail meal at 25% inclusion, catfish turn protein into body weight just as efficiently as with expensive fishmeal, but at a lower cost.

04/09/2025

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Water Quality Stability: How Snail-Based Diets Kept pH and Oxygen in Range

One of the biggest fears farmers have when introducing a new feed ingredient is: Will it spoil my water quality?

Poor-quality feeds often break down too quickly, release excess waste, or alter pond chemistry. This can reduce oxygen, increase ammonia, and eventually kill fish. That’s why when we tested snail meal (Achatina fulica, “Congo meat”) against fishmeal, we didn’t just look at growth, we also monitored water quality very closely.

👉🏾 Here’s what we found from our 8-week feeding trial:
• pH remained stable in all treatments, ranging from 6.52 to 6.82.
• Dissolved oxygen (DO) stayed within 5.6–6.2 mg/L.
• Temperature stayed around 26.4–27.8 °C, well within the recommended range for African catfish.

All these values are considered safe and optimal for Clarias gariepinus (African Catfish) culture.

Why this matters

👉🏾 Stable pH (6.5–7.0) means the pond ecosystem is balanced. Fish are not stressed by acidity or alkalinity swings. Unstable pH usually leads to poor appetite, stress, and sometimes mortalities.

👉🏾 Adequate dissolved oxygen (above 5 mg/L) ensures fish breathe comfortably. When DO drops below 4 mg/L, fish come to the surface to gasp, but with snail diets, oxygen stayed safely above this danger zone.

👉🏾 Temperature consistency (26–28 °C) provides the right environment for feed digestion and enzyme activity. Extreme temperatures slow down metabolism and reduce growth, but this did not happen with snail-based feeds.

Why didn’t snail meal pollute the water?
1. Balanced nutrient composition, Snail meal has lower ash (4.78%) compared to fishmeal (20.22%). That means less excess mineral waste leaching into the water.
2. Good protein-energy ratio, With 69.44% protein and 2,465 kcal/kg energy, snail meal was efficiently digested at moderate inclusion (25%). Less undigested feed meant less ammonia buildup.
3. Pellet stability, The feeds were properly pelleted and dried, reducing the chance of disintegration and water fouling.

The farmer’s reassurance

Many farmers worry that using “unusual” ingredients like snail meal will disturb water quality. But our study showed the opposite:

👉🏾 All water parameters stayed within the safe range, whether fish were fed 0%, 25%, 50%, 75% or even 100% snail meal diets.

This means farmers can experiment with snail meal without fear of damaging water quality, especially at the recommended 25% substitution level where growth and cost benefits are strongest.

Snail meal doesn’t just reduce feed costs , it also keeps your ponds stable.

03/09/2025

Ash Matters: Why Too Much Mineral in Fishmeal Isn’t Always a Good Thing

When farmers hear the word “ash” in feed analysis, many assume it is something good, more ash must mean more strength, right? But in aquaculture nutrition, ash simply refers to the total mineral content of a feed ingredient after it is completely burnt. And too much of it can actually be a problem.

In one of our studies comparing fishmeal and snail meal (Achatina fulica, commonly known as the African giant land snail or “Congo meat”), we saw a striking difference in ash content:
• Fishmeal ash: 20.22%
• Snail meal ash: 4.78%

At first glance, fishmeal looks “richer” because of its higher mineral content. But here’s the catch: fish only need minerals in certain balanced amounts. If the diet is overloaded with ash, it can cause:
• Poor digestibility, high ash dilutes the energy and protein density of the diet.
• Extra load on the fish’s system, too much calcium, phosphorus or other minerals can strain metabolic functions.
• Unnecessary waste in water, minerals not used by the fish end up polluting the pond, altering water quality.

What our results showed

Even though fishmeal had higher ash, it did not give better growth when compared to snail meal. In fact, the diets that included 25% snail meal (ash 4.78%) gave the same final weight and growth rate as the control diet of 100% fishmeal.

This means the lower ash in snail meal was not a weakness, it was an advantage. The nutrients (protein and energy) were more concentrated and more available to the fish, instead of being “crowded out” by excess minerals.

Linking ash to carcass composition

When we examined the body composition of catfish fed snail-based diets, we saw:
• Higher protein content in the flesh of fish fed with snail meal.
• Reduced fat and crude fiber compared to those fed only on fishmeal.

This suggests that the lower ash in snail meal allowed protein and energy to be used more efficiently, leading to better quality fish meat.

Takeaway

More ash does not mean more value. For example:
• Fishmeal (20.22% ash) often carries more minerals than the fish can use.
• Snail meal (4.78% ash) keeps minerals within a more useful range, making space for 69.44% crude protein and 2,465 kcal/kg of energy.

This balance is why diets with 25% snail meal supported good growth and reduced feed cost per kilogram of fish gained.

Fish don’t grow on ash, they grow on protein and energy. Too much ash is like paying for stones in your feed bag. Snail meal, with its lower ash and higher nutrients, gives fish more of what they actually need and less of what they don’t.