What about nitrite poisoning in aquaculture?

In the process of aquaculture, especially in high-density aquaculture, excessive nitrite poisoning often occurs, which brings a lot of losses to farmers. Like going to the hospital to see a doctor, we must first correctly judge the symptoms of fish and shrimp and determine that it is nitrite poisoning. The general symptoms are as follows: slow swimming, anorexia, slow response, shortness of breath, floating head, deep body color, dark red Gill and shrimp death at the bottom of the pond. When found, farmers are often in a hurry to deal with it, resulting in a lot of unnecessary losses. Here are a few specific examples.

Manager Jiang of Okedan Aquaculture Water quality detector

1. Want to quickly degrade the concentration of nitrite.

When many people detect high levels of nitrite (especially dead shrimp), the first thing that comes to mind is desperate ways to quickly degrade nitrite concentrations. But in fact, the stress caused by sudden change of nitrite concentration is more serious than that caused by transient high concentration to fish and shrimp.

two。 Blindly increase the dosage of oxygen enhancers.

Many people think that hypoxia is the cause of the increase of nitrite, but they do not know that this is not the only factor. In fact, nitrite poisoning is not due to the low content of dissolved oxygen in water, but due to the decrease of oxygen-carrying capacity of fish and shrimp blood, resulting in the decrease of dissolved oxygen in fish and shrimp blood, resulting in hypoxia symptoms. Therefore, only the use of oxygen enhancers can not solve the problem of blood hypoxia in fish and shrimp. Due to the excessive use of chemical oxygenators (such as calcium peroxide, sodium perborate, etc.), its severe oxygen evolution will aggravate the stress reaction of fish and shrimp, thus accelerating the death of fish and shrimp.

Aquaculture Water quality detector Manager Oakdan Jiang

3. Wrong use of flocculation and adsorption products.

A considerable part of the nitrite degradation products on the market are adsorption and ion exchanger products (such as polyaluminum chloride, alum, sodium thiosulfate, polypropionylammonium, etc.), these products contain strong condensation and sedimentation ingredients, so it seems to be able to quickly reduce the concentration of nitrite in water, but it makes many people pay a heavy price. The addition of adsorbents and flocculants to the water body can adsorb nitrite in the matrix, that is, the nitrite in the water body is concentrated in the adsorbent from a large range of water body and settled at the bottom of the pool, the result is that the concentration of nitrite in the middle layer and surface layer of the water decreases, but the nitrite in the bottom layer increases obviously.

3. Excessive abuse of microbial agents.

Many farmers will apply a variety of microbial agents when they encounter excessive nitrite, but they do not know that many microorganisms compete with each other, and some even inhibit each other. Therefore, microbial preparations must be carefully selected.

Aquaculture Water quality detector Manager Oakdan Jiang

The following are the correct methods for the prevention and treatment of nitrite poisoning in aquaculture:

First of all, the Okedan aquaculture water quality detector was used to detect whether the nitrite content in the pond exceeded the standard.

1. First detoxification and detoxification, alleviate toxicity, and then strengthen calcium supplement when nitrite poisoning occurs in fish and shrimp, the most direct and effective way is to try to expel or degrade the toxicity in the blood of fish and shrimp. Specific operation methods: apply glucose 2kg / mu in the morning, degrade toxins with chlorine-reducing products in the afternoon, and then mix the feed with salt and appetizer detoxification VC.

two。 Supplement energy, prevent stress, maintain normal physical energy nitrite poisoning, fish and shrimp will generally lose appetite or even stop eating, but at this time the energy consumption of fish and shrimp stress is 5 times 10 times that of normal. Therefore, it can be seen that after nitrite poisoning, the energy intake of fish and shrimp decreases (soft shell, empty stomach, hepatomegaly, etc.), but the energy consumption is doubled, resulting in fish and shrimp death due to energy depletion in a short time. So at this time, the application of timely supplement of calcium hard shell, energy and prevention, anti-stress.

3. Cultivating algae and fertilizing water is the fundamental way to solve the problem of high nitrite. The exuberant growth of algae can not only maintain sufficient oxygen in the water, but also promote the material transformation and energy flow in the water, which can provide favorable conditions for the conversion of nitrite. at this time, the cultivation of algae with fertilizer and water requires the combination of rapid and persistent effect to obtain ideal water color and effective degradation of nitrite.

4. Protect the liver and intestines, repair injured fish and shrimp nitrite poisoning will often appear soft shell, empty stomach, hepatomegaly, etc., if we do not take timely remedial measures, it will leave sequelae, light affect food intake, inhibit growth, serious stop growth, or even chronic death. Therefore, it is necessary to improve the immunity of prawns, protect liver and intestines, and repair damaged products to ensure the healthy growth of fish and shrimp.

Nitrite poisoning has always been a thorny problem in aquaculture. I hope everyone can use reliable water quality testing tools, learn more and ask aquatic experts, combined with practical experience, to master reasonable solutions.

Aquaculture Water quality detector Manager Oakdan Jiang