Shrimp Farming in Earthern Ponds

Key features of Fine bubbles (Microbubbles and Nanobubbles) to be used:

a. Nanobubbles (< 1 micrometer) and Microbubbles (10-60 micrometers) with slow rising velocities 

can remain and be suspended for a period of time long enough to be spread by water flow currents created by

the fine-bubbled-water flow and the paddle wheels (the most commonly used in shrimp farming)

b. Fine-bubbled water is made near the bottom sludge to provide necessary dissolved oxygen to

the shrimps and nitrification process supported by microbiome in the bottom sludge

c. Negative electrostatic charged fine bubbles can stick around suspended fine substances in pond 

(dead algae, fine shrimp excrements, dirts) which can then be floated up to water surface.

Regular and on-time removal of such floated dirts can help reduce water turbidity and viscosity.

Once the water clarify is improved, much more dissolved oxygen can be naturally created by algae

photosynthesis, which gives way to reduce the energy spent for aerators (paddle wheels)during day-time.

When water viscosity is reduced, aeration efficiency from surface aerators (paddle wheels) is much

improved.

d. For reduction and control of harmful bacteria and vibrio, Ozone Nanobubbles or Air Nanobubbles plus Hydrogen 

Peroxide can be used with caution.

Safer and more controllable sterilization effect by Ozone Nanobubbles or Air Nanobubbles (plus H2O2) 

can be performed in Protein Skimmers (or so-called Foam Fractionators) where suspended dirts after oxdization 

can be expelled at once out of the skimmed water while the ORP (oxidization-reduction potential) of the skimmed

water can be measured and monitored (not to exceed 300…350mV)

PROBLEM IDENTIFICATION STEPS

Mapping Low Dissolved Oxygen (DO) zones in pond:

• Digital (Flourescent) (Optical) DO meter
• Measure at 20-30 centimeter above pond bottom
• Measure at Peak DO time (2-3 pm afternoon) and Lowest DO time (4-5 am morning before sunrise)

Possible Sludge Build-up:

• Pond Center
• Pond Corners where no surface aerators operate

NAKASHIMA PROPOSAL

For Prevention and Mitigation

- Air Micro-Nanobubbles MNB

- Air Mili-Microbubbles Ven X

For Reactive and Periodical Control:

Ozone Nanobubbles or Air Nanobubble + H2O2

-Direct usage in Pond (caution required) – not preferred

-Protein Skimmers