natural farming

Aquaculture results-Shrimp

Aquaculture results-Shrimp

3 / Mar

Aquaculture results-Shrimp

During the culture of the larval stage of marine fish, live feed (such as: rotifer, copepoda, brine shrimp) is fundamental. The main purpose of this research was to investigate the effectiveness of chlorine dioxide in sterilizing the live feed and fertilized eggs of orange-spotted grouper (Epinephelus coioides). Chlorine dioxide was found to inhibit bacterial growth and increase the survival rate of live feed, at the same time increasing the hatching rate of orange-spotted grouper. In addition, Nervous Necrosis Virus (NNV) - IgY(Immunoglobulin Yolk), used to enrich live feed, acted as a passive immunization to viruses, so increasing the survival rate of grouper larvae.

Different concentrations of chlorine dioxide were used to sterilize live feed and fertilized eggs; results showed that a 10 minutes’ immersion bath at a concentration of 4 ppm was effective and did not result in harm to live feed. Similarly, a concentration of 2 ppm resulted in significant depletion of bacteria without affecting the hatching rate of the fertilized eggs.

Grouper larvae fed with sterilized, NNV-IgY-enrichment live feed, (the experimental group) survived at a rate of 5.79 %, while the control group (the feed of which was not enriched with NNV-IgY) survived at a rate of 4.36 %. Grouper larvae were challenged with a single dose of NNV pathogen, injected into the abdominal cavity. Survival rates were significantly higher in the experimental group than in the control group.


Whiteleg shrimp


Customer,feedback in Cebu,Philippine
With U-pro
90 days
90 days
Stocking Density
40-150 pcs/m2
150 pcs/m2
Length of Shrimp
13-14 cm
15-16 cm
Each Shrimp Weight
18 g
30 g



Customer feedback in Thailand
With U-pro
64 days
Stocking Number
70000 pcs
Stocking Density
45 pcs/m2
Total Harvest Weight
700 kg→950 kg
Feed Conversion Ratio 1.089
Survival Rate 97.9 %