4 major diseases threaten the shrimp industry. The first 3 have single causative agents. WFS — the most common — results from MULTIPLE causes and cannot be solved with antibiotics alone.
Field photos of the main diseases: EMS/AHPND-infected shrimp, translucent postlarvae (TPD), EHP spores under microscope, and WFS shrimp vs healthy.WFS is cumulative: SPF shrimp + EHP + Vibrio parahaemolyticus → White Feces Syndrome (Aranguren et al., 2021).
Implication: No single drug solves WFS. We must build a healthy microbiome + control multi-layer agents BEFORE outbreak.
Vibrio, EHP and parasites are almost always present — disease does not erupt because they appear, but because the pond slides out of its stable zone. Holding it there is not one product's job but three layers working at once: the pond water, the shrimp gut, and the shrimp itself. Each layer contributes different strains and functions; drop one and the other two cannot carry it.
Low riskhigh diversity — the pond recovers fast after a shock, outbreaks are rarer
Rising riskdiversity slipping — recovery weakens and risk creeps up
High risklow diversity — the pond struggles to recover and outbreaks come easily
POND WATER
T5
T6
SHRIMP GUT
GIT5
GIT6
The horizontal axis counts days from the FIRST SAMPLING, not from stocking. Monitoring data from ponds running the protocol: both the pond water and the shrimp gut hold their diversity index in the low-risk zone throughout. Values digitised from the original monitoring chart.
Beneficial microbial population (Rhodobacteraceae) sustained and rising across days of culture — proven by field monitoring.Bacterial risk indicator: Tenacibaculum density — causing ulcers and hepatorenal decline — held low and stable all crop.
Synthesis: The three layers run in parallel, not as substitutes. Clean water with a dysbiotic gut still fails; a good gut with weak host immunity still breaks under a shock. A farm using a single product line is standing on one leg.
A closer look at the GUT layer
This is the layer we can measure most clearly. Metagenomics classifies shrimp gut bacteria into 3 groups — beneficial, opportunistic, pathogenic — and the ratio among them decides whether the shrimp thrives or collapses.
HEPATOPANCREASreserves, detox, immunityGUTwhere the microbiome lives
The two places that decide shrimp health sit next to each other: the gut running along the back and the hepatopancreas just behind the head.
The shrimp gut holds
Yeasts
Protozoa
Viruses
Bacteria
All four are present. But the group that decides whether the pond holds or collapses is BACTERIA — and it is also the only one a farmer can steer, through feed and probiotics.
The bacteria in that gut fall into three groups — and it is the ratio between them that decides, not the mere presence of any one group.
HEPATOPANCREASreserves, detox, immunityGUTwhere the microbiome lives