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
A.Philippine
|
Customer，feedback in Cebu，Philippine
|
Normal
|
With U-pro |
|
DOC
|
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 |
B.Thailand
|
Customer feedback in Thailand
|
With U-pro
|
|
DOC
|
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 % |