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Importance of Dissolved Oxygen in Fish Farming/Aquaculture

Updated: Apr 23, 2023

Maintaining optimal levels of Dissolved Oxygen in fisheries is crucial for favourable fish production. If not taken seriously, it can lead to lower production of fish or even death. The total amount of oxygen in water is quiet less than the amount of oxygen in atmosphere. DO (DISSOLVED OXYGEN) is measured in PPM i.e parts per million. Most of the fish species require DO levels of just 5 PPM or maybe greater depending upon the size in order to survive. Also, a bigger fish will demand more oxygen as compared to a smaller fish. For Example: Shrimp Culture requires DO of only 3 MG/L. Both high and low levels of DO have an adverse effect on the health of fish. Fishes require DO in a set of specified range in order to get Proper Growth and No Fatalities.

Causes of Low DO in water:

1. Overstocking of fish in a tank i.e stocking over 8,000 fishes in a space of 6,000 fishes

2. Overfeeding the fish i.e giving feed equal to that required for 8,000 fishes but only 6,000 fishes are stocked in that particular pond

3. Fluctuation in pH is also a factor that leads to depletion in levels of DO

Symptoms of Low DO in water:

1. Fishes become lethargic

2. Fishes spend more time at the surface of water or near the aerators

3. Fishes do not eat the feed properly

Increasing DO Levels in water:

1. Nano Aeration Technology

2. Spraying water near the tanks in order to increase the surface level oxygen diffusion

3. Feeding according to the stocking density

If monitored on a regular basis, you'll be able to correct for small changes instead of replacing the water of your tank.

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