1. Too high dissolved oxygen is not conducive to the hatching of fish eggs. The fry are prone to bubble disease, and the fish will swim around excitedly, which is easy to die of fatigue. 2. Low dissolved oxygen will affect the physiological metabolism of aquatic products, and even cause the death of cultured aquatic products. 3. Dissolved oxygen shall be more than 4mg/L for 8 hours every night, not less than 5mg/L for 14 hours, and not less than 2mg/L at any time. 4. Dissolved oxygen will change within a day, and the lowest dissolved oxygen will occur at night.

A、 Harm of excessive dissolved oxygen in fish ponds

1. Hazards of excessive dissolved oxygen

(1) A slight increase in dissolved oxygen in the water will adversely affect the hatching of eggs and fry, making fry vulnerable to bubble disease, and even adversely affect small sized fish (summer flowers).

(2) When the dissolved oxygen in the water is high, the fish will be excited, and the small fry will be tired to death.

2. Hazards of low dissolved oxygen

(1) When the dissolved oxygen in water is lower than a certain level, the physiological metabolism and growth of aquatic products will be affected, but will not immediately lead to death. At this time, the dissolved oxygen concentration is called critical dissolved oxygen.

(2) When the dissolved oxygen continues to decrease and can no longer meet the minimum needs of physiological aquatic products, the cultured animals will suffocate and die. The dissolved oxygen concentration at this time is called lethal dissolved oxygen.

(3) Critical dissolved oxygen and lethal dissolved oxygen vary according to animal species and specifications, and will be affected by water temperature, salinity and other environmental factors. When water temperature rises, the lethal dissolved oxygen of animals will decline.

B、 What is the normal range of dissolved oxygen

1. Dissolved oxygen content

(1) The dissolved oxygen of aquaculture water will change within 24 hours, and the dissolved oxygen is the lowest at night.

(2) The dissolved oxygen must be more than 4mg/L for 8 hours (at night), not less than 5mg/L for 14 hours, and not less than 2mg/L at any time.

2. Source of dissolved oxygen

(1) In a windy environment, oxygen in the air will dissolve in the water, and the size of the local wind affects the speed of natural oxygen dissolution.

(2) The Roots blower can increase oxygen. Through connecting the aeration disk at the bottom of the pool, it can achieve comprehensive oxygen increase from the bottom to the surface, increase the contact area with the air, and promote oxygen dissolution.

(3) Oxygen released by algae in water body under photosynthesis is the main source of dissolved oxygen in pond, which accounts for 80-90% of the dissolved oxygen in pond.

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