Hazards and Solutions of Nitrite in Aquaculture

2023-07-24

Qingdao Zhongren Animal Medicine Co., Ltd

Zhongren Aquatic Products

Causes of 1. formation 

    Nitrite is an intermediate product in the process of converting ammonia into nitrate. In the middle and late stages of aquaculture, a large number of baits will cause the accumulation of residual baits and excreta in the water body. In addition, the regular use of disinfectants will destroy the balance of bacteria in the water body, resulting in insufficient supply of oxygen, hindering the nitrification process of nitrogen accumulated in the water body, resulting in the increase of ammonia nitrogen and nitrite content in the aquaculture water body, the problem of nitrite is the most prominent.

2. causes harm

    Nitrite can enter the blood by gill filaments, affecting the oxygen carrying capacity of blood, tissue hypoxia, at this time fish, shrimp food intake decreased, gill tissue lesions, breathing difficulties, restless. Serious, can make fish and shrimp poisoning, leading to fish and shrimp some metabolic organ dysfunction, physical decline, at this time the fish and shrimp are prone to disease and death.

3. Solution 

actual combat case

Time:12 July 2023

Venue: Xintan Salt Field, Yancheng, Jiangsu

Breed varieties: carp set of Penaeus vannamei

Farming area:200 acres, water depth of 1.6 meters

Water index: ammonia nitrogen0, nitrite 0.6,pH8.2

Description: Affected by the plum rains season, the rainy weather for many consecutive days has made the pond water body turbid and thin, shrimps have floating heads in the morning, and carp feed is obviously reduced. Measured nitrite rise0.6, the preliminary diagnosis was the hypoxic reaction of fish and shrimp caused by the thinness of the water body after the rain and the increase of sub salt.

 

Treatment Scheme

  1. On the morning of the first day, I used Bishui Jiedu (40 mu/bottle) detoxification and bottom change overlord (100 mu/barrel) to bottom, and soak probiotic group and diatom in the evening for later use.

On the second day, the soaked probiotic group and diatom flourishing water were sprinkled first, and then the beneficial algae and compound enzyme carbon source were supplemented with super algae species (20 mu/barrel) and phosphorus fertilizer to maintain a balanced carbon-nitrogen ratio and nitrogen-phosphorus ratio in the water body, promote the reproduction of algae and beneficial microorganisms, and enhance the effect of fertilizer and water.

Processing results

After two days of fertilizer and water, the color of the pond water changed from turbid to tender green. In the morning, the floating head of fish and shrimp disappeared, and the food intake of carp improved significantly. Subsalt was measuredThe 0.6 decreased to 0.2 and the pH increased to 8.5. After four days the sub-salt was reduced to 0.1.

Case analysis

In the middle and late stages of freshwater fish culture, the amount of feed increased significantly, feces and residual bait began to accumulate, the oxygen consumption at the bottom of the pool increased, coupled with the decline in water fertility in rainy weather, the lack of bottom oxygen caused by the increase in sub-salt, affecting the normal growth of fish and shrimp. Bishui Jiedu Anke directly reduces the toxicity of ammonia nitrogen and sub-salt in the water body, breaks the stratification of the water body, and promotes the dissolved oxygen in the atmosphere to enter the water body. The probiotic group contains a variety of beneficial active bacteria, which can directly absorb and transform ammonia nitrogen and sub-salt while promoting the reproduction of algae. Use phosphate fertilizer and compound enzyme carbon source to balance water nutrition and prevent excess nitrogen. When the water body is thin, diatom can be used with quick-acting fertilizer and super algae to provide sufficient dissolved oxygen for the pond. At the same time, with probiotic groups, the fertilizer effect can be more lasting.

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