SHRIMP COVERED WITH SLIME AND FOULING: CAUSES AND TREATMENT METHODS
In aquaculture, shrimp fouling with slime is often considered a “suspended sentence” for crop productivity.
It not only affects appearance and reduces commercial value, but also causes severe stress, breathing difficulties, and slow growth.
If farmers do not apply proper cleaning techniques, shrimp can easily become shocked and die in large numbers.
Let’s analyze the causes and find effective solutions to keep shrimp clean, healthy, and thriving.
1. Causes of slime buildup and fouling on shrimp
Shrimp fouling does not occur naturally—it results from an imbalance in the pond ecosystem.
It is also a sign that the shrimp are weakened, directly affecting their health and farming efficiency.
Why do shrimp develop slime and fouling?
- Over-nutrient environment:
Excess feed and shrimp waste accumulate, making the water eutrophic.
This creates ideal conditions for protozoa, attached algae, and fungi to grow on shrimp shells. - Slow molting:
Healthy shrimp molt regularly to shed their old shells.
When shrimp have weak hepatopancreas function, mineral deficiency, or disease, molting is delayed, allowing fouling organisms to attach to the old shell. - Dirty shell (sediment fouling):
Fine suspended particles stick to shrimp shells when water is too turbid or contains high organic matter.
Causes of gill fouling
The gills are the most sensitive respiratory organs.
Gill fouling is mainly caused by fungi, bacteria, or suspended particles attaching to gill filaments.
This blocks oxygen exchange, causing suffocation, surface swimming, and rapid weakening.
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2. Environmental treatment and bottom algae control
To solve the problem effectively, the first step is to “clean the pond.”
A clean environment eliminates habitats for parasites.
Using probiotics to remove slime
Instead of immediately using strong chemicals, farmers should prioritize high-dose probiotics:
- Cut nutrient sources:
Use probiotics containing Bacillus subtilis to break down organic waste and dead algae. - Stabilize water color:
Maintain water transparency at 30–40 cm.
This reduces sunlight penetration to the pond bottom, helping control bottom algae naturally and sustainably.
Safe use of chemicals
In severe cases, chemical treatment is necessary:
- Disinfectants (Iodine or BKC):
Effective against fungi and protozoa. Apply in the morning with strong aeration. - Glutaraldehyde:
A strong agent that removes fouling from shrimp shells.
Must follow dosage strictly to avoid shrimp shock or mass mortality.
3. Stimulating molting and shrimp recovery
“Changing to a new shell” is the fastest way for shrimp to eliminate slime buildup.
After environmental treatment, focus on molting stimulation.
Molting stimulation techniques
- Mineral supplementation:
Add minerals rich in Magnesium, Calcium, and Potassium to help shrimp quickly harden new shells. - Water exchange:
Replace 10–20% of pond water (if possible) to trigger synchronized molting through osmotic pressure changes.
Hepatopancreas and gut care
Shrimp molt effectively only when their hepatopancreas is healthy:
- Add liver-support supplements, herbs, and Vitamin C into feed to boost immunity.
- Use probiotics to improve digestion and nutrient absorption.
This ensures shrimp have enough energy to molt and develop clean, shiny shells.
Final advice
Shrimp fouling is often the result of poor pond management.
Farmers should proactively:
- Control algae density
- Regularly siphon pond bottoms
- Use probiotics consistently
When the environment is clean and shrimp are healthy, their shells remain smooth and shiny—leading to higher market value and better farming results.
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